CINXE.COM

<!DOCTYPE html> <html lang="fr-FR" xml:lang="fr" dir="ltr"> <head> <meta charset="utf-8">  <title>DELTAS - Encyclopædia Universalis</title> <meta http-equiv="x-ua-compatible" content="IE=edge,chrome=1" /> <meta name="generator" content="TYPO3 CMS" /> <meta name="description" content="Les deltas, dont la morphologie et la structure deviennent de mieux en mieux connues grâce aux images fournies par les satellites d'observation de la Terre et..." /> <meta name="robots" content="index, all, follow" /> <meta name="viewport" content="viewport-fit=cover, width=device-width, initial-scale=1.0, minimum-scale=1.0" /> <meta name="author" content="Encyclopædia Universalis" /> <meta property="og:title" content="DELTAS" /> <meta property="og:description" content="Les deltas, dont la morphologie et la structure deviennent de mieux en mieux connues grâce aux images fournies par les satellites d'observation de la Terre et aux forages pétroliers, ne se limitent pas aux constructions sédimentaires littorales classiques. Il existe en effet d'autres..." /> <meta property="og:url" content="https://www.universalis.fr/encyclopedie/deltas/" /> <meta property="og:locale" content="fr_FR" /> <meta property="og:site_name" content="Encyclopædia Universalis" /> <meta property="og:type" content="website" /> <meta property="og:image" content="https://www.universalis.fr/_web/static/icons/favicon.png" /> <meta property="og:image:width" content="256" /> <meta property="og:image:height" content="252" /> <meta name="twitter:title" content="DELTAS" /> <meta name="twitter:description" content="Les deltas, dont la morphologie et la structure deviennent de mieux en mieux connues grâce aux images fournies par les satellites d'observation de la Terre et aux forages pétroliers, ne se limitent pas aux constructions sédimentaires littorales classiques. Il existe en effet d'autres..." /> <meta name="twitter:card" content="summary" /> <meta name="twitter:site" content="@universalisfr" /> <meta name="location" content="France" /> <meta name="rating" content="General" /> <meta name="distribution" content="Global" /> <meta name="resource-type" content="document" /> <meta name="copyright" content="© Copyright 2024 - Universalis" /> <meta name="apple-mobile-web-app-title" content="Universalis" /> <meta name="apple-mobile-web-app-capable" content="yes" /> <meta name="apple-mobile-web-app-status-bar-style" content="default" /> <meta name="format-detection" content="telephone=no,date=no,address=no,email=no,url=no" /> <link rel="stylesheet" href="/_shared/pub/pub.css?1730108805" media="all"> <link rel="stylesheet" href="/_web/assets/css/home.css?1730119190" media="all"> <link rel="stylesheet" href="/_web/assets/css/classification.css?1730119190" media="all"> <link rel="canonical" href="https://www.universalis.fr/encyclopedie/deltas/" /> <link rel="next" href="https://www.universalis.fr/encyclopedie/deltas/2-les-deltas-sous-marins-profonds-ou-deep-sea-fans/" /> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"DELTAS","headline":"DELTAS","description":"Les deltas, dont la morphologie et la structure deviennent de mieux en mieux connues gr\u00e2ce aux images fournies par les satellites d'observation de la Terre et aux forages p\u00e9troliers, ne se limitent pas aux constructions s\u00e9dimentaires littorales classiques. Il existe en effet d'autres types de deltas, li\u00e9s \u00e0 des constructions s\u00e9dimentaires sous-marines profondes, beaucoup plus \u00e9tendus que les deltas continentaux\u00a0; il s'agit des deep-sea fans , ou \u00e9ventails s\u00e9dimentaires profonds.. Les deltas continentaux peuvent \u00eatre d\u00e9finis d'une mani\u00e8re tr\u00e8s g\u00e9n\u00e9rale comme des constructions s\u00e9dimentaires \u00e9labor\u00e9es au d\u00e9bouch\u00e9 des cours d'eau dans des \u00e9tendues d'eau permanentes. L'origine du mot delta remonte au v e \u00a0si\u00e8cle a...","url":"https:\/\/www.universalis.fr\/encyclopedie\/deltas\/","wordCount":"3794","image":{"@type":"ImageObject","url":"https:\/\/www.universalis.fr\/_web\/static\/icons\/favicon.png"},"isPartOf":{"@type":"WebPage","url":"https:\/\/www.universalis.fr\/encyclopedie\/deltas\/","name":"DELTAS"},"author":[{"@context":"https:\/\/schema.org","@type":"Person","name":"Gilbert BELLAICHE","familyName":"BELLAICHE","givenName":"Gilbert","description":"Directeur de recherche au C.N.R.S.","url":"https:\/\/www.universalis.fr\/auteurs\/gilbert-bellaiche\/"}],"publisher":{"@type":"Organization","name":"Encyclop\u00e6dia Universalis","alternateName":"Universalis","logo":{"@type":"ImageObject","url":"https:\/\/www.universalis.fr\/_web\/assets\/img\/banniere-fr.png"},"sameAs":["https:\/\/www.facebook.com\/EncyclopedieUniversalis\/","https:\/\/www.linkedin.com\/company\/encyclopaedia-universalis","https:\/\/www.twitter.com\/universalisfr","https:\/\/www.youtube.com\/channel\/UC0srTZiJaRaDw3fAvtCo4Ow"],"slogan":"Passeur de savoir"}}</script> <script type="application/ld+json">[{"@context":"https:\/\/schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Classification","item":"https:\/\/www.universalis.fr\/classification\/"},{"@type":"ListItem","position":2,"name":"G\u00e9ographie","item":"https:\/\/www.universalis.fr\/classification\/geographie\/"},{"@type":"ListItem","position":3,"name":"G\u00e9ographie physique","item":"https:\/\/www.universalis.fr\/classification\/geographie\/geographie-physique\/"},{"@type":"ListItem","position":4,"name":"Hydrographie","item":"https:\/\/www.universalis.fr\/classification\/geographie\/geographie-physique\/hydrographie\/"},{"@type":"ListItem","position":5,"name":"Hydrographie continentale","item":"https:\/\/www.universalis.fr\/classification\/geographie\/geographie-physique\/hydrographie\/hydrographie-continentale\/"},{"@type":"ListItem","position":6,"name":"Fleuves et rivi\u00e8res","item":"https:\/\/www.universalis.fr\/classification\/geographie\/geographie-physique\/hydrographie\/hydrographie-continentale\/fleuves-et-rivieres\/"}],"numberOfItems":6,"itemListOrder":"Ascending","name":"Classification : Fleuves et rivi\u00e8res"},{"@context":"https:\/\/schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Classification","item":"https:\/\/www.universalis.fr\/classification\/"},{"@type":"ListItem","position":2,"name":"Sciences de la Terre","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/"},{"@type":"ListItem","position":3,"name":"G\u00e9ologie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/"},{"@type":"ListItem","position":4,"name":"S\u00e9dimentologie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/sedimentologie\/"},{"@type":"ListItem","position":5,"name":"\u00c9rosion et s\u00e9dimentation, g\u00e9ologie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/sedimentologie\/erosion-et-sedimentation-geologie\/"},{"@type":"ListItem","position":6,"name":"\u00c9rosion et s\u00e9dimentation littorale et sous-marine","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/sedimentologie\/erosion-et-sedimentation-geologie\/erosion-et-sedimentation-littorale-et-sous-marine\/"}],"numberOfItems":6,"itemListOrder":"Ascending","name":"Classification : \u00c9rosion et s\u00e9dimentation littorale et sous-marine"},{"@context":"https:\/\/schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Classification","item":"https:\/\/www.universalis.fr\/classification\/"},{"@type":"ListItem","position":2,"name":"Sciences de la Terre","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/"},{"@type":"ListItem","position":3,"name":"G\u00e9ologie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/"},{"@type":"ListItem","position":4,"name":"G\u00e9omorphologie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/geomorphologie\/"},{"@type":"ListItem","position":5,"name":"G\u00e9omorphologie du littoral","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/geomorphologie\/geomorphologie-du-littoral\/"}],"numberOfItems":5,"itemListOrder":"Ascending","name":"Classification : G\u00e9omorphologie du littoral"},{"@context":"https:\/\/schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Classification","item":"https:\/\/www.universalis.fr\/classification\/"},{"@type":"ListItem","position":2,"name":"Sciences de la Terre","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/"},{"@type":"ListItem","position":3,"name":"Hydrologie continentale","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/hydrologie-continentale\/"},{"@type":"ListItem","position":4,"name":"Hydrologie fluviale ou potamologie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/hydrologie-continentale\/hydrologie-fluviale-ou-potamologie\/"},{"@type":"ListItem","position":5,"name":"G\u00e9omorphologie fluviale","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/hydrologie-continentale\/hydrologie-fluviale-ou-potamologie\/geomorphologie-fluviale\/"}],"numberOfItems":5,"itemListOrder":"Ascending","name":"Classification : G\u00e9omorphologie fluviale"},{"@context":"https:\/\/schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Classification","item":"https:\/\/www.universalis.fr\/classification\/"},{"@type":"ListItem","position":2,"name":"Sciences de la Terre","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/"},{"@type":"ListItem","position":3,"name":"Oc\u00e9anographie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/oceanographie\/"},{"@type":"ListItem","position":4,"name":"G\u00e9ologie marine","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/oceanographie\/geologie-marine\/"},{"@type":"ListItem","position":5,"name":"G\u00e9ologie du littoral","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/oceanographie\/geologie-marine\/geologie-du-littoral\/"}],"numberOfItems":5,"itemListOrder":"Ascending","name":"Classification : G\u00e9ologie du littoral"},{"@context":"https:\/\/schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Classification","item":"https:\/\/www.universalis.fr\/classification\/"},{"@type":"ListItem","position":2,"name":"Sciences de la Terre","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/"},{"@type":"ListItem","position":3,"name":"G\u00e9ologie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/"},{"@type":"ListItem","position":4,"name":"G\u00e9omorphologie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/geomorphologie\/"},{"@type":"ListItem","position":5,"name":"G\u00e9omorphologie sous-marine","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/geologie\/geomorphologie\/geomorphologie-sous-marine\/"}],"numberOfItems":5,"itemListOrder":"Ascending","name":"Classification : G\u00e9omorphologie sous-marine"},{"@context":"https:\/\/schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Classification","item":"https:\/\/www.universalis.fr\/classification\/"},{"@type":"ListItem","position":2,"name":"Sciences de la Terre","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/"},{"@type":"ListItem","position":3,"name":"Oc\u00e9anographie","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/oceanographie\/"},{"@type":"ListItem","position":4,"name":"G\u00e9ologie marine","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/oceanographie\/geologie-marine\/"},{"@type":"ListItem","position":5,"name":"G\u00e9ologie sous-marine","item":"https:\/\/www.universalis.fr\/classification\/sciences-de-la-terre\/oceanographie\/geologie-marine\/geologie-sous-marine\/"}],"numberOfItems":5,"itemListOrder":"Ascending","name":"Classification : G\u00e9ologie sous-marine"}]</script> <meta name="apple-mobile-web-app-capable" content="yes"/> <meta name="mobile-web-app-capable" content="yes"/> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <meta name="apple-mobile-web-app-title" content="Universalis"> <meta name="theme-color" content="#526D78"> <link rel="preconnect" href="https://statistiques.universalis.fr" /> <link rel="preconnect" href="https://cmp.inmobi.com" /> <link rel="search" type="application/opensearchdescription+xml" title="Universalis FR" href="/_web/static/search-fr.xml" /> <link rel="manifest" href="/_web/static/manifest.json"> <link rel="icon" type="image/png" href="/_web/static/icons/favicon.png"> <link rel="apple-touch-icon" href="/_web/static/icons/fr-apple-touch-icon.png" /> <link rel="apple-touch-icon" sizes="57x57" href="/_web/static/icons/fr-apple-touch-icon-57x57.png" /> <link rel="apple-touch-icon" sizes="72x72" href="/_web/static/icons/fr-apple-touch-icon-72x72.png" /> <link rel="apple-touch-icon" sizes="76x76" href="/_web/static/icons/fr-apple-touch-icon-76x76.png" /> <link rel="apple-touch-icon" sizes="114x114" href="/_web/static/icons/fr-apple-touch-icon-114x114.png" /> <link rel="apple-touch-icon" sizes="120x120" href="/_web/static/icons/fr-apple-touch-icon-120x120.png" /> <link rel="apple-touch-icon" sizes="144x144" href="/_web/static/icons/fr-apple-touch-icon-144x144.png" /> <link rel="apple-touch-icon" sizes="152x152" href="/_web/static/icons/fr-apple-touch-icon-152x152.png" /> <link rel="apple-touch-icon" sizes="180x180" href="/_web/static/icons/fr-apple-touch-icon-180x180.png" /> <link rel="apple-touch-startup-image" media="screen and (device-width: 834px) and (device-height: 1194px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/11__iPad_Pro__10.5__iPad_Pro_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 810px) and (device-height: 1080px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/10.2__iPad_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 744px) and (device-height: 1133px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/8.3__iPad_Mini_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 810px) and (device-height: 1080px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/10.2__iPad_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 820px) and (device-height: 1180px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/10.9__iPad_Air_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 744px) and (device-height: 1133px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/8.3__iPad_Mini_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 1024px) and (device-height: 1366px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/12.9__iPad_Pro_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 428px) and (device-height: 926px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_14_Plus__iPhone_13_Pro_Max__iPhone_12_Pro_Max_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 414px) and (device-height: 896px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_11_Pro_Max__iPhone_XS_Max_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 1024px) and (device-height: 1366px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/12.9__iPad_Pro_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 768px) and (device-height: 1024px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/9.7__iPad_Pro__7.9__iPad_mini__9.7__iPad_Air__9.7__iPad_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 375px) and (device-height: 812px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_13_mini__iPhone_12_mini__iPhone_11_Pro__iPhone_XS__iPhone_X_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 820px) and (device-height: 1180px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/10.9__iPad_Air_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 393px) and (device-height: 852px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_14_Pro_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 414px) and (device-height: 896px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_11_Pro_Max__iPhone_XS_Max_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 414px) and (device-height: 736px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_8_Plus__iPhone_7_Plus__iPhone_6s_Plus__iPhone_6_Plus_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/4__iPhone_SE__iPod_touch_5th_generation_and_later_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 393px) and (device-height: 852px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_14_Pro_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 414px) and (device-height: 896px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_11__iPhone_XR_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 375px) and (device-height: 667px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_8__iPhone_7__iPhone_6s__iPhone_6__4.7__iPhone_SE_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/4__iPhone_SE__iPod_touch_5th_generation_and_later_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 390px) and (device-height: 844px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_14__iPhone_13_Pro__iPhone_13__iPhone_12_Pro__iPhone_12_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 375px) and (device-height: 812px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_13_mini__iPhone_12_mini__iPhone_11_Pro__iPhone_XS__iPhone_X_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 834px) and (device-height: 1112px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/10.5__iPad_Air_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 390px) and (device-height: 844px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_14__iPhone_13_Pro__iPhone_13__iPhone_12_Pro__iPhone_12_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 768px) and (device-height: 1024px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/9.7__iPad_Pro__7.9__iPad_mini__9.7__iPad_Air__9.7__iPad_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 430px) and (device-height: 932px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_14_Pro_Max_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 428px) and (device-height: 926px) and (-webkit-device-pixel-ratio: 3) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_14_Plus__iPhone_13_Pro_Max__iPhone_12_Pro_Max_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 414px) and (device-height: 896px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_11__iPhone_XR_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 375px) and (device-height: 667px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="/_web/static/img/splash/iPhone_8__iPhone_7__iPhone_6s__iPhone_6__4.7__iPhone_SE_portrait.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 834px) and (device-height: 1112px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/10.5__iPad_Air_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 834px) and (device-height: 1194px) and (-webkit-device-pixel-ratio: 2) and (orientation: landscape)" href="/_web/static/img/splash/11__iPad_Pro__10.5__iPad_Pro_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 414px) and (device-height: 736px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_8_Plus__iPhone_7_Plus__iPhone_6s_Plus__iPhone_6_Plus_landscape.png"> <link rel="apple-touch-startup-image" media="screen and (device-width: 430px) and (device-height: 932px) and (-webkit-device-pixel-ratio: 3) and (orientation: landscape)" href="/_web/static/img/splash/iPhone_14_Pro_Max_landscape.png"> <script>!function(a,b,c){if(c in b&&b[c]){var d,e=a.location,f=/^(a|html)$/i;a.addEventListener("click",function(a){for(d=a.target;!f.test(d.nodeName);)d=d.parentNode;"href"in d&&(d.href.indexOf("http")||~d.href.indexOf(e.host))&&(a.preventDefault(),e.href=d.href)},!1),a.querySelector("html").classList.add("standalone")}}(document,window.navigator,"standalone")</script> <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//statistiques.universalis.fr/"; _paq.push(['setTrackerUrl', u+'matomo.php']); _paq.push(['setSiteId', '1']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); })(); </script> <style>.swiper-container[data-loaded=false] .swiper-wrapper .swiper-slide{display:none}.swiper-container[data-loaded=false] .swiper-wrapper .swiper-slide:first-child{display:block}img{max-width:100%;height:auto;max-height:250px}img.d-formule{max-height:none}strong{font-weight:bold !important}.dark-mode body{background:#29363a !important}.loader{display:none;height:100vh}.loader:after{display:block;margin:auto;content:"";background:url(/_web/assets/img/banniere-fr.png) no-repeat center;background-size:contain;width:50%;height:50%;position:absolute;top:50%;left:50%;transform:translate(-50%, -50%);opacity:.25}#page_3 .pub-container,#page_16 .pub-container{display:none !important}#skip{padding:5px 15px;position:absolute;background:rgba(0,0,0,.85);color:#fff;left:10%;transform:translateY(-100%);transition:transform .3s;border-bottom-left-radius:6px;border-bottom-right-radius:6px;z-index:100;text-decoration:none}#skip:focus{transform:translateY(0%);box-shadow:0 0 10px #333}.login-form-wrapper-mobile{display:none}.site-fr .article-quote{display:none !important}@media(max-width: 768px){.login-form-wrapper-mobile{display:block;text-align:center;margin-top:-1em;margin-bottom:1em}}body.loading{overflow:hidden}body.loading>*{display:none}body.loading .loader{display:block}.dropdown-menu,.d-none,#podcast audio{display:none}.list-inline-item{display:inline-block}.offcanvas{visibility:hidden}.main-navbar-wrapper .btn-universalis{background-color:#e8eced;color:#000;font-weight:normal}.offcanvas{display:none !important;height:0 !important}.offcanvas[data-loaded=true]{display:inherit !important;height:inherit !important}.clearfix{clear:both}.fr .is-edu{display:none !important}#podcast{min-height:90px}#article-medias-strip-junior{min-height:255px}#callSommaire{position:fixed;bottom:10px;left:10px;z-index:2}#qc-cmp2-ui{padding:10px !important}.qc-cmp2-summary-buttons{justify-content:space-around !important}.qc-cmp2-summary-buttons button[mode=secondary],.qc-cmp2-footer button[mode=secondary]{border:none;box-shadow:none}.eCBsvP.eCBsvP{height:auto !important}.qc-cmp-cleanslate{background-color:rgba(33,41,52,.95) !important}.fill-universalis{fill:#1c3479}.fill-universalis-up{fill:#526d78}@media(min-width: 768px){.qc-cmp2-publisher-logo-container{text-align:center}.qc-cmp2-publisher-logo-container figure img{display:block !important}}#page_14 .filter-article-container{display:none}#newsletter_subscription .text-light{color:#fff !important}#bandeau-footer{display:none}</style> <link rel="stylesheet" id="typo-css" href="/_web/assets/css/typo.css?t=20240418-1" /><script>let cssLoaded=!1,bodyLoaded=!1;const loadedTO=setTimeout((()=>{cssLoaded=!0,bodyLoaded=!0,loaded()}),5e3),loaded=function(){cssLoaded&&bodyLoaded&&document.body.classList.contains("loading")&&(document.body.className=document.body.className.replace("loading","").trim(),clearTimeout(loadedTO))};</script> <link rel="preload" href="/_web/assets/css/lazy.css?t=20240418-1" as="style" media="all" crossorigin onload="this.rel=`stylesheet`; cssLoaded = true; loaded()" /><style>.breadcrumb{--bs-breadcrumb-padding-x: 0;--bs-breadcrumb-padding-y: 0;--bs-breadcrumb-margin-bottom: 1rem;--bs-breadcrumb-bg: ;--bs-breadcrumb-border-radius: ;--bs-breadcrumb-divider-color: #6c757d;--bs-breadcrumb-item-padding-x: 0.5rem;--bs-breadcrumb-item-active-color: #6c757d;display:flex;flex-wrap:wrap;padding:var(--bs-breadcrumb-padding-y) var(--bs-breadcrumb-padding-x);margin-bottom:var(--bs-breadcrumb-margin-bottom);font-size:var(--bs-breadcrumb-font-size);list-style:none;background-color:var(--bs-breadcrumb-bg);border-radius:var(--bs-breadcrumb-border-radius)}.breadcrumb-item+.breadcrumb-item{padding-left:var(--bs-breadcrumb-item-padding-x)}.breadcrumb-item+.breadcrumb-item::before{float:left;padding-right:var(--bs-breadcrumb-item-padding-x);color:var(--bs-breadcrumb-divider-color);content:var(--bs-breadcrumb-divider, "/") /* rtl: var(--bs-breadcrumb-divider, "/") */}.breadcrumb-item.active{color:var(--bs-breadcrumb-item-active-color)}.breadcrumb{padding:.5rem 1rem !important;background-color:#f5f5f5 !important;border-radius:.375rem !important}.breadcrumb .breadcrumb-item i.label-sub{font-size:.85em;font-weight:normal}.breadcrumb .breadcrumb-item a{text-decoration:none}.breadcrumb .breadcrumb-item a:hover{text-decoration:underline}.breadcrumb .breadcrumb-item.active{font-weight:bold}.breadcrumb .breadcrumb-item+.breadcrumb-item::before{background-image:url('data:image/svg+xml;charset=UTF-8, <svg aria-hidden="true" focusable="false" data-prefix="far" data-icon="chevron-double-right" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="svg-inline--fa fa-chevron-double-right fa-w-14 fa-7x"><path style="fill: rgb(97, 104, 118);" d="M57.7 38.1l209.4 209.4c4.7 4.7 4.7 12.3 0 17L57.7 473.9c-4.7 4.7-12.3 4.7-17 0l-19.8-19.8c-4.7-4.7-4.7-12.3 0-17L201.6 256 20.9 74.9c-4.7-4.7-4.7-12.3 0-17l19.8-19.8c4.7-4.7 12.3-4.7 17 0zm143 0l-19.8 19.8c-4.7 4.7-4.7 12.3 0 17L361.6 256 180.9 437.1c-4.7 4.7-4.7 12.3 0 17l19.8 19.8c4.7 4.7 12.3 4.7 17 0l209.4-209.4c4.7-4.7 4.7-12.3 0-17L217.7 38.1c-4.7-4.7-12.3-4.7-17 0z" class=""></path></svg>');background-repeat:no-repeat;background-position:center;content:"";width:.5rem;height:100%;margin-right:.5rem}.list-group{--bs-list-group-color: #212529;--bs-list-group-bg: #fff;--bs-list-group-border-color: rgba(0, 0, 0, 0.125);--bs-list-group-border-width: 1px;--bs-list-group-border-radius: 0.375rem;--bs-list-group-item-padding-x: 1rem;--bs-list-group-item-padding-y: 0.5rem;--bs-list-group-action-color: #495057;--bs-list-group-action-hover-color: #495057;--bs-list-group-action-hover-bg: #f8f9fa;--bs-list-group-action-active-color: #212529;--bs-list-group-action-active-bg: #e9ecef;--bs-list-group-disabled-color: #6c757d;--bs-list-group-disabled-bg: #fff;--bs-list-group-active-color: #fff;--bs-list-group-active-bg: #526d78;--bs-list-group-active-border-color: #526d78;display:flex;flex-direction:column;padding-left:0;margin-bottom:0;border-radius:var(--bs-list-group-border-radius)}.list-group-numbered{list-style-type:none;counter-reset:section}.list-group-numbered>.list-group-item::before{content:counters(section, ".") ". ";counter-increment:section}.list-group-item-action{width:100%;color:var(--bs-list-group-action-color);text-align:inherit}.list-group-item-action:hover,.list-group-item-action:focus{z-index:1;color:var(--bs-list-group-action-hover-color);text-decoration:none;background-color:var(--bs-list-group-action-hover-bg)}.list-group-item-action:active{color:var(--bs-list-group-action-active-color);background-color:var(--bs-list-group-action-active-bg)}.list-group-item{position:relative;display:block;padding:var(--bs-list-group-item-padding-y) var(--bs-list-group-item-padding-x);color:var(--bs-list-group-color);text-decoration:none;background-color:var(--bs-list-group-bg);border:var(--bs-list-group-border-width) solid var(--bs-list-group-border-color)}.list-group-item:first-child{border-top-left-radius:inherit;border-top-right-radius:inherit}.list-group-item:last-child{border-bottom-right-radius:inherit;border-bottom-left-radius:inherit}.list-group-item.disabled,.list-group-item:disabled{color:var(--bs-list-group-disabled-color);pointer-events:none;background-color:var(--bs-list-group-disabled-bg)}.list-group-item.active{z-index:2;color:var(--bs-list-group-active-color);background-color:var(--bs-list-group-active-bg);border-color:var(--bs-list-group-active-border-color)}.list-group-item+.list-group-item{border-top-width:0}.list-group-item+.list-group-item.active{margin-top:calc(-1 * var(--bs-list-group-border-width));border-top-width:var(--bs-list-group-border-width)}.list-group-horizontal{flex-direction:row}.list-group-horizontal>.list-group-item:first-child:not(:last-child){border-bottom-left-radius:var(--bs-list-group-border-radius);border-top-right-radius:0}.list-group-horizontal>.list-group-item:last-child:not(:first-child){border-top-right-radius:var(--bs-list-group-border-radius);border-bottom-left-radius:0}.list-group-horizontal>.list-group-item.active{margin-top:0}.list-group-horizontal>.list-group-item+.list-group-item{border-top-width:var(--bs-list-group-border-width);border-left-width:0}.list-group-horizontal>.list-group-item+.list-group-item.active{margin-left:calc(-1 * var(--bs-list-group-border-width));border-left-width:var(--bs-list-group-border-width)}@media(min-width: 576px){.list-group-horizontal-sm{flex-direction:row}.list-group-horizontal-sm>.list-group-item:first-child:not(:last-child){border-bottom-left-radius:var(--bs-list-group-border-radius);border-top-right-radius:0}.list-group-horizontal-sm>.list-group-item:last-child:not(:first-child){border-top-right-radius:var(--bs-list-group-border-radius);border-bottom-left-radius:0}.list-group-horizontal-sm>.list-group-item.active{margin-top:0}.list-group-horizontal-sm>.list-group-item+.list-group-item{border-top-width:var(--bs-list-group-border-width);border-left-width:0}.list-group-horizontal-sm>.list-group-item+.list-group-item.active{margin-left:calc(-1 * var(--bs-list-group-border-width));border-left-width:var(--bs-list-group-border-width)}}@media(min-width: 768px){.list-group-horizontal-md{flex-direction:row}.list-group-horizontal-md>.list-group-item:first-child:not(:last-child){border-bottom-left-radius:var(--bs-list-group-border-radius);border-top-right-radius:0}.list-group-horizontal-md>.list-group-item:last-child:not(:first-child){border-top-right-radius:var(--bs-list-group-border-radius);border-bottom-left-radius:0}.list-group-horizontal-md>.list-group-item.active{margin-top:0}.list-group-horizontal-md>.list-group-item+.list-group-item{border-top-width:var(--bs-list-group-border-width);border-left-width:0}.list-group-horizontal-md>.list-group-item+.list-group-item.active{margin-left:calc(-1 * var(--bs-list-group-border-width));border-left-width:var(--bs-list-group-border-width)}}@media(min-width: 992px){.list-group-horizontal-lg{flex-direction:row}.list-group-horizontal-lg>.list-group-item:first-child:not(:last-child){border-bottom-left-radius:var(--bs-list-group-border-radius);border-top-right-radius:0}.list-group-horizontal-lg>.list-group-item:last-child:not(:first-child){border-top-right-radius:var(--bs-list-group-border-radius);border-bottom-left-radius:0}.list-group-horizontal-lg>.list-group-item.active{margin-top:0}.list-group-horizontal-lg>.list-group-item+.list-group-item{border-top-width:var(--bs-list-group-border-width);border-left-width:0}.list-group-horizontal-lg>.list-group-item+.list-group-item.active{margin-left:calc(-1 * var(--bs-list-group-border-width));border-left-width:var(--bs-list-group-border-width)}}@media(min-width: 1200px){.list-group-horizontal-xl{flex-direction:row}.list-group-horizontal-xl>.list-group-item:first-child:not(:last-child){border-bottom-left-radius:var(--bs-list-group-border-radius);border-top-right-radius:0}.list-group-horizontal-xl>.list-group-item:last-child:not(:first-child){border-top-right-radius:var(--bs-list-group-border-radius);border-bottom-left-radius:0}.list-group-horizontal-xl>.list-group-item.active{margin-top:0}.list-group-horizontal-xl>.list-group-item+.list-group-item{border-top-width:var(--bs-list-group-border-width);border-left-width:0}.list-group-horizontal-xl>.list-group-item+.list-group-item.active{margin-left:calc(-1 * var(--bs-list-group-border-width));border-left-width:var(--bs-list-group-border-width)}}@media(min-width: 1400px){.list-group-horizontal-xxl{flex-direction:row}.list-group-horizontal-xxl>.list-group-item:first-child:not(:last-child){border-bottom-left-radius:var(--bs-list-group-border-radius);border-top-right-radius:0}.list-group-horizontal-xxl>.list-group-item:last-child:not(:first-child){border-top-right-radius:var(--bs-list-group-border-radius);border-bottom-left-radius:0}.list-group-horizontal-xxl>.list-group-item.active{margin-top:0}.list-group-horizontal-xxl>.list-group-item+.list-group-item{border-top-width:var(--bs-list-group-border-width);border-left-width:0}.list-group-horizontal-xxl>.list-group-item+.list-group-item.active{margin-left:calc(-1 * var(--bs-list-group-border-width));border-left-width:var(--bs-list-group-border-width)}}.list-group-flush{border-radius:0}.list-group-flush>.list-group-item{border-width:0 0 var(--bs-list-group-border-width)}.list-group-flush>.list-group-item:last-child{border-bottom-width:0}.list-group-item-primary{color:#314148;background-color:#dce2e4}.list-group-item-primary.list-group-item-action:hover,.list-group-item-primary.list-group-item-action:focus{color:#314148;background-color:#c6cbcd}.list-group-item-primary.list-group-item-action.active{color:#fff;background-color:#314148;border-color:#314148}.list-group-item-secondary{color:#192023;background-color:#d4d7d8}.list-group-item-secondary.list-group-item-action:hover,.list-group-item-secondary.list-group-item-action:focus{color:#192023;background-color:#bfc2c2}.list-group-item-secondary.list-group-item-action.active{color:#fff;background-color:#192023;border-color:#192023}.list-group-item-success{color:#0f5132;background-color:#d1e7dd}.list-group-item-success.list-group-item-action:hover,.list-group-item-success.list-group-item-action:focus{color:#0f5132;background-color:#bcd0c7}.list-group-item-success.list-group-item-action.active{color:#fff;background-color:#0f5132;border-color:#0f5132}.list-group-item-info{color:#055160;background-color:#cff4fc}.list-group-item-info.list-group-item-action:hover,.list-group-item-info.list-group-item-action:focus{color:#055160;background-color:#badce3}.list-group-item-info.list-group-item-action.active{color:#fff;background-color:#055160;border-color:#055160}.list-group-item-warning{color:#664d03;background-color:#fff3cd}.list-group-item-warning.list-group-item-action:hover,.list-group-item-warning.list-group-item-action:focus{color:#664d03;background-color:#e6dbb9}.list-group-item-warning.list-group-item-action.active{color:#fff;background-color:#664d03;border-color:#664d03}.list-group-item-danger{color:#851a31;background-color:#f8d5dc}.list-group-item-danger.list-group-item-action:hover,.list-group-item-danger.list-group-item-action:focus{color:#851a31;background-color:#dfc0c6}.list-group-item-danger.list-group-item-action.active{color:#fff;background-color:#851a31;border-color:#851a31}.list-group-item-light{color:#5d5e5f;background-color:#fafbfb}.list-group-item-light.list-group-item-action:hover,.list-group-item-light.list-group-item-action:focus{color:#5d5e5f;background-color:#e1e2e2}.list-group-item-light.list-group-item-action.active{color:#fff;background-color:#5d5e5f;border-color:#5d5e5f}.list-group-item-dark{color:#192023;background-color:#d4d7d8}.list-group-item-dark.list-group-item-action:hover,.list-group-item-dark.list-group-item-action:focus{color:#192023;background-color:#bfc2c2}.list-group-item-dark.list-group-item-action.active{color:#fff;background-color:#192023;border-color:#192023}.badge{--bs-badge-padding-x: 0.65em;--bs-badge-padding-y: 0.35em;--bs-badge-font-size:0.75em;--bs-badge-font-weight: 700;--bs-badge-color: #fff;--bs-badge-border-radius: 0.375rem;display:inline-block;padding:var(--bs-badge-padding-y) var(--bs-badge-padding-x);font-size:var(--bs-badge-font-size);font-weight:var(--bs-badge-font-weight);line-height:1;color:var(--bs-badge-color);text-align:center;white-space:nowrap;vertical-align:baseline;border-radius:var(--bs-badge-border-radius)}.badge:empty{display:none}.btn .badge{position:relative;top:-1px}.btn-group,.btn-group-vertical{position:relative;display:inline-flex;vertical-align:middle}.btn-group>.btn,.btn-group-vertical>.btn{position:relative;flex:1 1 auto}.btn-group>.btn-check:checked+.btn,.btn-group>.btn-check:focus+.btn,.btn-group>.btn:hover,.btn-group>.btn:focus,.btn-group>.btn:active,.btn-group>.btn.active,.btn-group-vertical>.btn-check:checked+.btn,.btn-group-vertical>.btn-check:focus+.btn,.btn-group-vertical>.btn:hover,.btn-group-vertical>.btn:focus,.btn-group-vertical>.btn:active,.btn-group-vertical>.btn.active{z-index:1}.btn-toolbar{display:flex;flex-wrap:wrap;justify-content:flex-start}.btn-toolbar .input-group{width:auto}.btn-group{border-radius:.375rem}.btn-group>:not(.btn-check:first-child)+.btn,.btn-group>.btn-group:not(:first-child){margin-left:-1px}.btn-group>.btn:not(:last-child):not(.dropdown-toggle),.btn-group>.btn.dropdown-toggle-split:first-child,.btn-group>.btn-group:not(:last-child)>.btn{border-top-right-radius:0;border-bottom-right-radius:0}.btn-group>.btn:nth-child(n+3),.btn-group>:not(.btn-check)+.btn,.btn-group>.btn-group:not(:first-child)>.btn{border-top-left-radius:0;border-bottom-left-radius:0}.dropdown-toggle-split{padding-right:.5625rem;padding-left:.5625rem}.dropdown-toggle-split::after,.dropup .dropdown-toggle-split::after,.dropend .dropdown-toggle-split::after{margin-left:0}.dropstart .dropdown-toggle-split::before{margin-right:0}.btn-sm+.dropdown-toggle-split,.btn-group-sm>.btn+.dropdown-toggle-split{padding-right:.375rem;padding-left:.375rem}.btn-lg+.dropdown-toggle-split,.btn-group-lg>.btn+.dropdown-toggle-split{padding-right:.75rem;padding-left:.75rem}.btn-group-vertical{flex-direction:column;align-items:flex-start;justify-content:center}.btn-group-vertical>.btn,.btn-group-vertical>.btn-group{width:100%}.btn-group-vertical>.btn:not(:first-child),.btn-group-vertical>.btn-group:not(:first-child){margin-top:-1px}.btn-group-vertical>.btn:not(:last-child):not(.dropdown-toggle),.btn-group-vertical>.btn-group:not(:last-child)>.btn{border-bottom-right-radius:0;border-bottom-left-radius:0}.btn-group-vertical>.btn~.btn,.btn-group-vertical>.btn-group:not(:first-child)>.btn{border-top-left-radius:0;border-top-right-radius:0}.pagination{--bs-pagination-padding-x: 0.75rem;--bs-pagination-padding-y: 0.375rem;--bs-pagination-font-size:0.95rem;--bs-pagination-color: var(--bs-link-color);--bs-pagination-bg: #fff;--bs-pagination-border-width: 1px;--bs-pagination-border-color: #dee2e6;--bs-pagination-border-radius: 0.375rem;--bs-pagination-hover-color: var(--bs-link-hover-color);--bs-pagination-hover-bg: #e9ecef;--bs-pagination-hover-border-color: #dee2e6;--bs-pagination-focus-color: var(--bs-link-hover-color);--bs-pagination-focus-bg: #e9ecef;--bs-pagination-focus-box-shadow: 0 0 0 0.25rem rgba(82, 109, 120, 0.25);--bs-pagination-active-color: #fff;--bs-pagination-active-bg: #526d78;--bs-pagination-active-border-color: #526d78;--bs-pagination-disabled-color: #6c757d;--bs-pagination-disabled-bg: #fff;--bs-pagination-disabled-border-color: #dee2e6;display:flex;padding-left:0;list-style:none}.page-link{position:relative;display:block;padding:var(--bs-pagination-padding-y) var(--bs-pagination-padding-x);font-size:var(--bs-pagination-font-size);color:var(--bs-pagination-color);text-decoration:none;background-color:var(--bs-pagination-bg);border:var(--bs-pagination-border-width) solid var(--bs-pagination-border-color);transition:color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out}@media(prefers-reduced-motion: reduce){.page-link{transition:none}}.page-link:hover{z-index:2;color:var(--bs-pagination-hover-color);background-color:var(--bs-pagination-hover-bg);border-color:var(--bs-pagination-hover-border-color)}.page-link:focus{z-index:3;color:var(--bs-pagination-focus-color);background-color:var(--bs-pagination-focus-bg);outline:0;box-shadow:var(--bs-pagination-focus-box-shadow)}.page-link.active,.active>.page-link{z-index:3;color:var(--bs-pagination-active-color);background-color:var(--bs-pagination-active-bg);border-color:var(--bs-pagination-active-border-color)}.page-link.disabled,.disabled>.page-link{color:var(--bs-pagination-disabled-color);pointer-events:none;background-color:var(--bs-pagination-disabled-bg);border-color:var(--bs-pagination-disabled-border-color)}.page-item:not(:first-child) .page-link{margin-left:-1px}.page-item:first-child .page-link{border-top-left-radius:var(--bs-pagination-border-radius);border-bottom-left-radius:var(--bs-pagination-border-radius)}.page-item:last-child .page-link{border-top-right-radius:var(--bs-pagination-border-radius);border-bottom-right-radius:var(--bs-pagination-border-radius)}.pagination-lg{--bs-pagination-padding-x: 1.5rem;--bs-pagination-padding-y: 0.75rem;--bs-pagination-font-size:1.1875rem;--bs-pagination-border-radius: 0.5rem}.pagination-sm{--bs-pagination-padding-x: 0.5rem;--bs-pagination-padding-y: 0.25rem;--bs-pagination-font-size:0.83125rem;--bs-pagination-border-radius: 0.25rem}.list-group a.list-group-item{border-color:#f8fafc}.list-group a.list-group-item.active{background-color:#526d78}.list-group a.list-group-item h3{margin:0;line-height:1.5;font-size:.95rem;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","Noto Sans","Liberation Sans",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";padding-bottom:0}.list-group a.list-group-item h3:hover{color:#fff}.list-group a.list-group-item h3 .badge{line-height:1.25}.list-group a.list-group-item:hover{background-color:#526d78;color:#fff}.list-group a.list-group-item:hover h3{color:inherit}i.anchor{display:block;position:relative;visibility:hidden;top:calc(-25vh + 15px)}.article__props{font-size:.8rem;color:#000;font-style:italic;padding:.2rem 0;margin:0 auto;display:block}.content h6,.h6,h5,.h5,h4,.h4,h3,.h3,h2,.h2,h1,.h1{margin-bottom:0;padding-bottom:.5rem}titre_main+titre_subs{margin-left:.25em}pc,.pc{text-transform:uppercase;font-size:.8em}h2 .pc,h3 .pc,h4 .pc,h5 .pc,h6 .pc{font-size:inherit !important}.sup-sub{position:relative;margin-right:1rem}.sup-sub sup,.sup-sub sub,.sup-sub inf{position:absolute;display:block;left:0}.sup-sub sup{top:.25rem}.sup-sub sub,.sup-sub inf{bottom:.25rem}p:empty{display:none !important}.content.whole .read-more{display:none}blockquote{position:relative;text-align:center;padding:1rem 1.4rem;width:80%;margin:1rem auto 2rem;font-family:Times;font-style:italic;box-shadow:0 .5rem 1rem rgba(0,0,0,.15);border-radius:.375rem}blockquote:before{position:absolute;color:#526d78;font-size:3rem;content:"«";top:-22px;margin-right:-28px;right:100%}blockquote:after{position:absolute;color:#526d78;font-size:3rem;content:"»";margin-left:-28px;left:100%;top:auto;bottom:-12px}.offcanvas,.offcanvas-xxl,.offcanvas-xl,.offcanvas-lg,.offcanvas-md,.offcanvas-sm{--bs-offcanvas-zindex: 1045;--bs-offcanvas-width: 400px;--bs-offcanvas-height: 30vh;--bs-offcanvas-padding-x: 1rem;--bs-offcanvas-padding-y: 1rem;--bs-offcanvas-color: ;--bs-offcanvas-bg: #fff;--bs-offcanvas-border-width: 1px;--bs-offcanvas-border-color: var(--bs-border-color-translucent);--bs-offcanvas-box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075)}@media(max-width: 575.98px){.offcanvas-sm{position:fixed;bottom:0;z-index:var(--bs-offcanvas-zindex);display:flex;flex-direction:column;max-width:100%;color:var(--bs-offcanvas-color);visibility:hidden;background-color:var(--bs-offcanvas-bg);background-clip:padding-box;outline:0;transition:transform .3s ease-in-out}}@media(max-width: 575.98px)and (prefers-reduced-motion: reduce){.offcanvas-sm{transition:none}}@media(max-width: 575.98px){.offcanvas-sm.offcanvas-start{top:0;left:0;width:var(--bs-offcanvas-width);border-right:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(-100%)}}@media(max-width: 575.98px){.offcanvas-sm.offcanvas-end{top:0;right:0;width:var(--bs-offcanvas-width);border-left:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(100%)}}@media(max-width: 575.98px){.offcanvas-sm.offcanvas-top{top:0;right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-bottom:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(-100%)}}@media(max-width: 575.98px){.offcanvas-sm.offcanvas-bottom{right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-top:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(100%)}}@media(max-width: 575.98px){.offcanvas-sm.showing,.offcanvas-sm.show:not(.hiding){transform:none}}@media(max-width: 575.98px){.offcanvas-sm.showing,.offcanvas-sm.hiding,.offcanvas-sm.show{visibility:visible}}@media(min-width: 576px){.offcanvas-sm{--bs-offcanvas-height: auto;--bs-offcanvas-border-width: 0;background-color:transparent !important}.offcanvas-sm .offcanvas-header{display:none}.offcanvas-sm .offcanvas-body{display:flex;flex-grow:0;padding:0;overflow-y:visible;background-color:transparent !important}}@media(max-width: 767.98px){.offcanvas-md{position:fixed;bottom:0;z-index:var(--bs-offcanvas-zindex);display:flex;flex-direction:column;max-width:100%;color:var(--bs-offcanvas-color);visibility:hidden;background-color:var(--bs-offcanvas-bg);background-clip:padding-box;outline:0;transition:transform .3s ease-in-out}}@media(max-width: 767.98px)and (prefers-reduced-motion: reduce){.offcanvas-md{transition:none}}@media(max-width: 767.98px){.offcanvas-md.offcanvas-start{top:0;left:0;width:var(--bs-offcanvas-width);border-right:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(-100%)}}@media(max-width: 767.98px){.offcanvas-md.offcanvas-end{top:0;right:0;width:var(--bs-offcanvas-width);border-left:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(100%)}}@media(max-width: 767.98px){.offcanvas-md.offcanvas-top{top:0;right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-bottom:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(-100%)}}@media(max-width: 767.98px){.offcanvas-md.offcanvas-bottom{right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-top:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(100%)}}@media(max-width: 767.98px){.offcanvas-md.showing,.offcanvas-md.show:not(.hiding){transform:none}}@media(max-width: 767.98px){.offcanvas-md.showing,.offcanvas-md.hiding,.offcanvas-md.show{visibility:visible}}@media(min-width: 768px){.offcanvas-md{--bs-offcanvas-height: auto;--bs-offcanvas-border-width: 0;background-color:transparent !important}.offcanvas-md .offcanvas-header{display:none}.offcanvas-md .offcanvas-body{display:flex;flex-grow:0;padding:0;overflow-y:visible;background-color:transparent !important}}@media(max-width: 991.98px){.offcanvas-lg{position:fixed;bottom:0;z-index:var(--bs-offcanvas-zindex);display:flex;flex-direction:column;max-width:100%;color:var(--bs-offcanvas-color);visibility:hidden;background-color:var(--bs-offcanvas-bg);background-clip:padding-box;outline:0;transition:transform .3s ease-in-out}}@media(max-width: 991.98px)and (prefers-reduced-motion: reduce){.offcanvas-lg{transition:none}}@media(max-width: 991.98px){.offcanvas-lg.offcanvas-start{top:0;left:0;width:var(--bs-offcanvas-width);border-right:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(-100%)}}@media(max-width: 991.98px){.offcanvas-lg.offcanvas-end{top:0;right:0;width:var(--bs-offcanvas-width);border-left:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(100%)}}@media(max-width: 991.98px){.offcanvas-lg.offcanvas-top{top:0;right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-bottom:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(-100%)}}@media(max-width: 991.98px){.offcanvas-lg.offcanvas-bottom{right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-top:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(100%)}}@media(max-width: 991.98px){.offcanvas-lg.showing,.offcanvas-lg.show:not(.hiding){transform:none}}@media(max-width: 991.98px){.offcanvas-lg.showing,.offcanvas-lg.hiding,.offcanvas-lg.show{visibility:visible}}@media(min-width: 992px){.offcanvas-lg{--bs-offcanvas-height: auto;--bs-offcanvas-border-width: 0;background-color:transparent !important}.offcanvas-lg .offcanvas-header{display:none}.offcanvas-lg .offcanvas-body{display:flex;flex-grow:0;padding:0;overflow-y:visible;background-color:transparent !important}}@media(max-width: 1199.98px){.offcanvas-xl{position:fixed;bottom:0;z-index:var(--bs-offcanvas-zindex);display:flex;flex-direction:column;max-width:100%;color:var(--bs-offcanvas-color);visibility:hidden;background-color:var(--bs-offcanvas-bg);background-clip:padding-box;outline:0;transition:transform .3s ease-in-out}}@media(max-width: 1199.98px)and (prefers-reduced-motion: reduce){.offcanvas-xl{transition:none}}@media(max-width: 1199.98px){.offcanvas-xl.offcanvas-start{top:0;left:0;width:var(--bs-offcanvas-width);border-right:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(-100%)}}@media(max-width: 1199.98px){.offcanvas-xl.offcanvas-end{top:0;right:0;width:var(--bs-offcanvas-width);border-left:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(100%)}}@media(max-width: 1199.98px){.offcanvas-xl.offcanvas-top{top:0;right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-bottom:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(-100%)}}@media(max-width: 1199.98px){.offcanvas-xl.offcanvas-bottom{right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-top:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(100%)}}@media(max-width: 1199.98px){.offcanvas-xl.showing,.offcanvas-xl.show:not(.hiding){transform:none}}@media(max-width: 1199.98px){.offcanvas-xl.showing,.offcanvas-xl.hiding,.offcanvas-xl.show{visibility:visible}}@media(min-width: 1200px){.offcanvas-xl{--bs-offcanvas-height: auto;--bs-offcanvas-border-width: 0;background-color:transparent !important}.offcanvas-xl .offcanvas-header{display:none}.offcanvas-xl .offcanvas-body{display:flex;flex-grow:0;padding:0;overflow-y:visible;background-color:transparent !important}}@media(max-width: 1399.98px){.offcanvas-xxl{position:fixed;bottom:0;z-index:var(--bs-offcanvas-zindex);display:flex;flex-direction:column;max-width:100%;color:var(--bs-offcanvas-color);visibility:hidden;background-color:var(--bs-offcanvas-bg);background-clip:padding-box;outline:0;transition:transform .3s ease-in-out}}@media(max-width: 1399.98px)and (prefers-reduced-motion: reduce){.offcanvas-xxl{transition:none}}@media(max-width: 1399.98px){.offcanvas-xxl.offcanvas-start{top:0;left:0;width:var(--bs-offcanvas-width);border-right:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(-100%)}}@media(max-width: 1399.98px){.offcanvas-xxl.offcanvas-end{top:0;right:0;width:var(--bs-offcanvas-width);border-left:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(100%)}}@media(max-width: 1399.98px){.offcanvas-xxl.offcanvas-top{top:0;right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-bottom:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(-100%)}}@media(max-width: 1399.98px){.offcanvas-xxl.offcanvas-bottom{right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-top:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(100%)}}@media(max-width: 1399.98px){.offcanvas-xxl.showing,.offcanvas-xxl.show:not(.hiding){transform:none}}@media(max-width: 1399.98px){.offcanvas-xxl.showing,.offcanvas-xxl.hiding,.offcanvas-xxl.show{visibility:visible}}@media(min-width: 1400px){.offcanvas-xxl{--bs-offcanvas-height: auto;--bs-offcanvas-border-width: 0;background-color:transparent !important}.offcanvas-xxl .offcanvas-header{display:none}.offcanvas-xxl .offcanvas-body{display:flex;flex-grow:0;padding:0;overflow-y:visible;background-color:transparent !important}}.offcanvas{position:fixed;bottom:0;z-index:var(--bs-offcanvas-zindex);display:flex;flex-direction:column;max-width:100%;color:var(--bs-offcanvas-color);visibility:hidden;background-color:var(--bs-offcanvas-bg);background-clip:padding-box;outline:0;transition:transform .3s ease-in-out}@media(prefers-reduced-motion: reduce){.offcanvas{transition:none}}.offcanvas.offcanvas-start{top:0;left:0;width:var(--bs-offcanvas-width);border-right:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(-100%)}.offcanvas.offcanvas-end{top:0;right:0;width:var(--bs-offcanvas-width);border-left:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateX(100%)}.offcanvas.offcanvas-top{top:0;right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-bottom:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(-100%)}.offcanvas.offcanvas-bottom{right:0;left:0;height:var(--bs-offcanvas-height);max-height:100%;border-top:var(--bs-offcanvas-border-width) solid var(--bs-offcanvas-border-color);transform:translateY(100%)}.offcanvas.showing,.offcanvas.show:not(.hiding){transform:none}.offcanvas.showing,.offcanvas.hiding,.offcanvas.show{visibility:visible}.offcanvas-backdrop{position:fixed;top:0;left:0;z-index:1040;width:100vw;height:100vh;background-color:#000}.offcanvas-backdrop.fade{opacity:0}.offcanvas-backdrop.show{opacity:.5}.offcanvas-header{display:flex;align-items:center;justify-content:space-between;padding:var(--bs-offcanvas-padding-y) var(--bs-offcanvas-padding-x)}.offcanvas-header .btn-close{padding:calc(var(--bs-offcanvas-padding-y) * .5) calc(var(--bs-offcanvas-padding-x) * .5);margin-top:calc(-.5 * var(--bs-offcanvas-padding-y));margin-right:calc(-.5 * var(--bs-offcanvas-padding-x));margin-bottom:calc(-.5 * var(--bs-offcanvas-padding-y))}.offcanvas-title{margin-bottom:0;line-height:1.5}.offcanvas-body{flex-grow:1;padding:var(--bs-offcanvas-padding-y) var(--bs-offcanvas-padding-x);overflow-y:auto}.article__single__toc .float-end{float:right !important}.article__single__toc .list-group-item{border:none;border-radius:0}.article__single__toc .list-group-item i{transition:transform .2s;position:absolute;left:.25rem;margin-top:.25rem}.article__single__toc .list-group-item.expanded i{transform:rotateZ(90deg)}.article__single__toc>.list-group{background:transparent}.article__single__toc>.list-group>.list-group{margin-left:.5em}.article__single__toc>.list-group>.list-group>.list-group{margin-left:.75em;border-left:1px solid #ccc}.article__single__toc>.list-group>.list-group>.list-group>.list-group-item{padding:.5em}#callSommaire{position:fixed;bottom:10px;left:10px;z-index:2}.free-toc-container{position:fixed;bottom:3em;left:.5em;max-width:300px;z-index:10}@media(max-width: 768px){.free-toc-container{bottom:5em}}#free-toc{max-height:calc(100vh - 275px);overflow:auto}.free-toc-container .list-group a{text-decoration:none}.free-toc-container .list-group li:not(.active):hover{background-color:#f5f5f5;color:#fff}.free-toc-container .list-group .active a{color:#fff;pointer-events:none;font-weight:bold}.pagination{--bs-pagination-padding-x: 0.75rem;--bs-pagination-padding-y: 0.375rem;--bs-pagination-font-size:0.95rem;--bs-pagination-color: var(--bs-link-color);--bs-pagination-bg: #fff;--bs-pagination-border-width: 1px;--bs-pagination-border-color: #dee2e6;--bs-pagination-border-radius: 0.375rem;--bs-pagination-hover-color: var(--bs-link-hover-color);--bs-pagination-hover-bg: #e9ecef;--bs-pagination-hover-border-color: #dee2e6;--bs-pagination-focus-color: var(--bs-link-hover-color);--bs-pagination-focus-bg: #e9ecef;--bs-pagination-focus-box-shadow: 0 0 0 0.25rem rgba(82, 109, 120, 0.25);--bs-pagination-active-color: #fff;--bs-pagination-active-bg: #526d78;--bs-pagination-active-border-color: #526d78;--bs-pagination-disabled-color: #6c757d;--bs-pagination-disabled-bg: #fff;--bs-pagination-disabled-border-color: #dee2e6;display:flex;padding-left:0;list-style:none}.page-link{position:relative;display:block;padding:var(--bs-pagination-padding-y) var(--bs-pagination-padding-x);font-size:var(--bs-pagination-font-size);color:var(--bs-pagination-color);text-decoration:none;background-color:var(--bs-pagination-bg);border:var(--bs-pagination-border-width) solid var(--bs-pagination-border-color);transition:color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out}@media(prefers-reduced-motion: reduce){.page-link{transition:none}}.page-link:hover{z-index:2;color:var(--bs-pagination-hover-color);background-color:var(--bs-pagination-hover-bg);border-color:var(--bs-pagination-hover-border-color)}.page-link:focus{z-index:3;color:var(--bs-pagination-focus-color);background-color:var(--bs-pagination-focus-bg);outline:0;box-shadow:var(--bs-pagination-focus-box-shadow)}.page-link.active,.active>.page-link{z-index:3;color:var(--bs-pagination-active-color);background-color:var(--bs-pagination-active-bg);border-color:var(--bs-pagination-active-border-color)}.page-link.disabled,.disabled>.page-link{color:var(--bs-pagination-disabled-color);pointer-events:none;background-color:var(--bs-pagination-disabled-bg);border-color:var(--bs-pagination-disabled-border-color)}.page-item:not(:first-child) .page-link{margin-left:-1px}.page-item:first-child .page-link{border-top-left-radius:var(--bs-pagination-border-radius);border-bottom-left-radius:var(--bs-pagination-border-radius)}.page-item:last-child .page-link{border-top-right-radius:var(--bs-pagination-border-radius);border-bottom-right-radius:var(--bs-pagination-border-radius)}.pagination-lg{--bs-pagination-padding-x: 1.5rem;--bs-pagination-padding-y: 0.75rem;--bs-pagination-font-size:1.1875rem;--bs-pagination-border-radius: 0.5rem}.pagination-sm{--bs-pagination-padding-x: 0.5rem;--bs-pagination-padding-y: 0.25rem;--bs-pagination-font-size:0.83125rem;--bs-pagination-border-radius: 0.25rem}.table{--bs-table-color: var(--bs-body-color);--bs-table-bg: transparent;--bs-table-border-color: var(--bs-border-color);--bs-table-accent-bg: transparent;--bs-table-striped-color: var(--bs-body-color);--bs-table-striped-bg: rgba(0, 0, 0, 0.05);--bs-table-active-color: var(--bs-body-color);--bs-table-active-bg: rgba(0, 0, 0, 0.1);--bs-table-hover-color: var(--bs-body-color);--bs-table-hover-bg: rgba(0, 0, 0, 0.075);width:100%;margin-bottom:1rem;color:var(--bs-table-color);vertical-align:top;border-color:var(--bs-table-border-color)}.table>:not(caption)>*>*{padding:.5rem .5rem;background-color:var(--bs-table-bg);border-bottom-width:1px;box-shadow:inset 0 0 0 9999px var(--bs-table-accent-bg)}.table>tbody{vertical-align:inherit}.table>thead{vertical-align:bottom}.table-group-divider{border-top:2px solid currentcolor}.caption-top{caption-side:top}.table-sm>:not(caption)>*>*{padding:.25rem .25rem}.table-bordered>:not(caption)>*{border-width:1px 0}.table-bordered>:not(caption)>*>*{border-width:0 1px}.table-borderless>:not(caption)>*>*{border-bottom-width:0}.table-borderless>:not(:first-child){border-top-width:0}.table-striped>tbody>tr:nth-of-type(odd)>*{--bs-table-accent-bg: var(--bs-table-striped-bg);color:var(--bs-table-striped-color)}.table-striped-columns>:not(caption)>tr>:nth-child(even){--bs-table-accent-bg: var(--bs-table-striped-bg);color:var(--bs-table-striped-color)}.table-active{--bs-table-accent-bg: var(--bs-table-active-bg);color:var(--bs-table-active-color)}.table-hover>tbody>tr:hover>*{--bs-table-accent-bg: var(--bs-table-hover-bg);color:var(--bs-table-hover-color)}.table-primary{--bs-table-color: #000;--bs-table-bg: #dce2e4;--bs-table-border-color: #c6cbcd;--bs-table-striped-bg: #d1d7d9;--bs-table-striped-color: #000;--bs-table-active-bg: #c6cbcd;--bs-table-active-color: #000;--bs-table-hover-bg: #ccd1d3;--bs-table-hover-color: #000;color:var(--bs-table-color);border-color:var(--bs-table-border-color)}.table-secondary{--bs-table-color: #000;--bs-table-bg: #e2e3e5;--bs-table-border-color: #cbccce;--bs-table-striped-bg: #d7d8da;--bs-table-striped-color: #000;--bs-table-active-bg: #cbccce;--bs-table-active-color: #000;--bs-table-hover-bg: #d1d2d4;--bs-table-hover-color: #000;color:var(--bs-table-color);border-color:var(--bs-table-border-color)}.table-success{--bs-table-color: #000;--bs-table-bg: #d1e7dd;--bs-table-border-color: #bcd0c7;--bs-table-striped-bg: #c7dbd2;--bs-table-striped-color: #000;--bs-table-active-bg: #bcd0c7;--bs-table-active-color: #000;--bs-table-hover-bg: #c1d6cc;--bs-table-hover-color: #000;color:var(--bs-table-color);border-color:var(--bs-table-border-color)}.table-info{--bs-table-color: #000;--bs-table-bg: #cff4fc;--bs-table-border-color: #badce3;--bs-table-striped-bg: #c5e8ef;--bs-table-striped-color: #000;--bs-table-active-bg: #badce3;--bs-table-active-color: #000;--bs-table-hover-bg: #bfe2e9;--bs-table-hover-color: #000;color:var(--bs-table-color);border-color:var(--bs-table-border-color)}.table-warning{--bs-table-color: #000;--bs-table-bg: #fff3cd;--bs-table-border-color: #e6dbb9;--bs-table-striped-bg: #f2e7c3;--bs-table-striped-color: #000;--bs-table-active-bg: #e6dbb9;--bs-table-active-color: #000;--bs-table-hover-bg: #ece1be;--bs-table-hover-color: #000;color:var(--bs-table-color);border-color:var(--bs-table-border-color)}.table-danger{--bs-table-color: #000;--bs-table-bg: #f8d5dc;--bs-table-border-color: #dfc0c6;--bs-table-striped-bg: #eccad1;--bs-table-striped-color: #000;--bs-table-active-bg: #dfc0c6;--bs-table-active-color: #000;--bs-table-hover-bg: #e5c5cc;--bs-table-hover-color: #000;color:var(--bs-table-color);border-color:var(--bs-table-border-color)}.table-light{--bs-table-color: #000;--bs-table-bg: #e8eced;--bs-table-border-color: #d1d4d5;--bs-table-striped-bg: #dce0e1;--bs-table-striped-color: #000;--bs-table-active-bg: #d1d4d5;--bs-table-active-color: #000;--bs-table-hover-bg: #d7dadb;--bs-table-hover-color: #000;color:var(--bs-table-color);border-color:var(--bs-table-border-color)}.table-dark{--bs-table-color: #fff;--bs-table-bg: #29363a;--bs-table-border-color: #3e4a4e;--bs-table-striped-bg: #344044;--bs-table-striped-color: #fff;--bs-table-active-bg: #3e4a4e;--bs-table-active-color: #fff;--bs-table-hover-bg: #394549;--bs-table-hover-color: #fff;color:var(--bs-table-color);border-color:var(--bs-table-border-color)}.table-responsive{overflow-x:auto;-webkit-overflow-scrolling:touch}@media(max-width: 575.98px){.table-responsive-sm{overflow-x:auto;-webkit-overflow-scrolling:touch}}@media(max-width: 767.98px){.table-responsive-md{overflow-x:auto;-webkit-overflow-scrolling:touch}}@media(max-width: 991.98px){.table-responsive-lg{overflow-x:auto;-webkit-overflow-scrolling:touch}}@media(max-width: 1199.98px){.table-responsive-xl{overflow-x:auto;-webkit-overflow-scrolling:touch}}@media(max-width: 1399.98px){.table-responsive-xxl{overflow-x:auto;-webkit-overflow-scrolling:touch}}span.rg{font-weight:bold}.lined-bg{background:repeating-linear-gradient(45deg, #606dbc, #606dbc 10px, #465298 10px, #465298 20px)}@media(min-width: 768px){.geography-list-group{grid-template-columns:repeat(2, 1fr);display:grid;grid-gap:.5rem}.geography-list-group .list-group-item+.list-group-item{border-top-width:1px}}@media(min-width: 1200px){.geography-list-group{grid-template-columns:repeat(3, 1fr);display:grid;grid-gap:.5rem}.geography-list-group .list-group-item+.list-group-item{border-top-width:1px}}table .note{font-size:.8rem;line-height:1.1;position:relative;padding-left:.8rem;display:block;margin-bottom:.5rem;font-style:italic}table .note b{position:absolute;font-style:normal;left:0;top:0}h1 em.label-sub{font-style:normal}.event-date{font-size:1rem;font-style:italic;color:#526d78}.event-label{font-weight:bold;margin-bottom:0}.event-label .event-date{font-size:.8em}.badge{background-color:#e8eced !important;border-radius:0;color:#526d78}.badge.text-bg-primary{color:#fff !important;background-color:#0d6efd !important}.badge.text-bg-success{color:#fff !important;background-color:#198754 !important}.badge .bad a{text-decoration:underline}.event-single .badge{font-size:.85rem;font-weight:normal;margin-top:-0.25rem;padding-left:1rem !important;padding-right:1rem !important}.figure{display:flex;flex-direction:column;justify-content:center}@media(max-width: 768px){.figure{background:#f5f5f5;box-shadow:0 .125rem .25rem rgba(0,0,0,.075);margin-bottom:1em !important;padding-top:.5em !important}.figure .popover{background:transparent}.figure .popover .popover-header{color:#222}}img.media_resized{max-width:100%;height:auto;width:auto;margin:0 auto;max-height:200px}.protected{position:relative}.protected:after{position:absolute;content:"";width:100%;height:100%;top:0;left:0;background:transparent}@media(min-width: 992px){.inline-media-group{display:flex;justify-content:space-around}}@media screen and (max-width: 480px){.nav.nav-tabs{display:block}.nav.nav-tabs .nav-item{display:block !important}.nav.nav-tabs .nav-link{border:none;width:100%;margin:0}.nav.nav-tabs .nav-link.active{background-color:#e8eced;margin:0}}.index-list{border:1px solid #dfdfdf;background-color:#fafafa;border-radius:.375em;box-shadow:0 .125rem .25rem rgba(0,0,0,.075) !important;margin-bottom:1rem !important;margin-right:.25rem !important;margin-left:.25rem !important;padding:1rem}.index-list a{padding:.125em .25em;border-radius:.375em;display:inline-block}.index-list a.active{background:#526d78;color:#fff;text-decoration:none}.index-list a.text-muted{color:#a4a9ae !important}.card{--bs-card-spacer-y: 1rem;--bs-card-spacer-x: 1rem;--bs-card-title-spacer-y: 0.5rem;--bs-card-border-width: 1px;--bs-card-border-color: var(--bs-border-color-translucent);--bs-card-border-radius: 0.375rem;--bs-card-box-shadow: ;--bs-card-inner-border-radius: calc(0.375rem - 1px);--bs-card-cap-padding-y: 0.5rem;--bs-card-cap-padding-x: 1rem;--bs-card-cap-bg: rgba(0, 0, 0, 0.03);--bs-card-cap-color: ;--bs-card-height: ;--bs-card-color: ;--bs-card-bg: #fff;--bs-card-img-overlay-padding: 1rem;--bs-card-group-margin: 0.75rem;position:relative;display:flex;flex-direction:column;min-width:0;height:var(--bs-card-height);word-wrap:break-word;background-color:var(--bs-card-bg);background-clip:border-box;border:var(--bs-card-border-width) solid var(--bs-card-border-color);border-radius:var(--bs-card-border-radius)}.card>hr{margin-right:0;margin-left:0}.card>.list-group{border-top:inherit;border-bottom:inherit}.card>.list-group:first-child{border-top-width:0;border-top-left-radius:var(--bs-card-inner-border-radius);border-top-right-radius:var(--bs-card-inner-border-radius)}.card>.list-group:last-child{border-bottom-width:0;border-bottom-right-radius:var(--bs-card-inner-border-radius);border-bottom-left-radius:var(--bs-card-inner-border-radius)}.card>.card-header+.list-group,.card>.list-group+.card-footer{border-top:0}.card-body{flex:1 1 auto;padding:var(--bs-card-spacer-y) var(--bs-card-spacer-x);color:var(--bs-card-color)}.card-title{margin-bottom:var(--bs-card-title-spacer-y)}.card-subtitle{margin-top:calc(-.5 * var(--bs-card-title-spacer-y));margin-bottom:0}.card-text:last-child{margin-bottom:0}.card-link+.card-link{margin-left:var(--bs-card-spacer-x)}.card-header{padding:var(--bs-card-cap-padding-y) var(--bs-card-cap-padding-x);margin-bottom:0;color:var(--bs-card-cap-color);background-color:var(--bs-card-cap-bg);border-bottom:var(--bs-card-border-width) solid var(--bs-card-border-color)}.card-header:first-child{border-radius:var(--bs-card-inner-border-radius) var(--bs-card-inner-border-radius) 0 0}.card-footer{padding:var(--bs-card-cap-padding-y) var(--bs-card-cap-padding-x);color:var(--bs-card-cap-color);background-color:var(--bs-card-cap-bg);border-top:var(--bs-card-border-width) solid var(--bs-card-border-color)}.card-footer:last-child{border-radius:0 0 var(--bs-card-inner-border-radius) var(--bs-card-inner-border-radius)}.card-header-tabs{margin-right:calc(-.5 * var(--bs-card-cap-padding-x));margin-bottom:calc(-1 * var(--bs-card-cap-padding-y));margin-left:calc(-.5 * var(--bs-card-cap-padding-x));border-bottom:0}.card-header-tabs .nav-link.active{background-color:var(--bs-card-bg);border-bottom-color:var(--bs-card-bg)}.card-header-pills{margin-right:calc(-.5 * var(--bs-card-cap-padding-x));margin-left:calc(-.5 * var(--bs-card-cap-padding-x))}.card-img-overlay{position:absolute;top:0;right:0;bottom:0;left:0;padding:var(--bs-card-img-overlay-padding);border-radius:var(--bs-card-inner-border-radius)}.card-img,.card-img-top,.card-img-bottom{width:100%}.card-img,.card-img-top{border-top-left-radius:var(--bs-card-inner-border-radius);border-top-right-radius:var(--bs-card-inner-border-radius)}.card-img,.card-img-bottom{border-bottom-right-radius:var(--bs-card-inner-border-radius);border-bottom-left-radius:var(--bs-card-inner-border-radius)}.card-group>.card{margin-bottom:var(--bs-card-group-margin)}@media(min-width: 576px){.card-group{display:flex;flex-flow:row wrap}.card-group>.card{flex:1 0 0%;margin-bottom:0}.card-group>.card+.card{margin-left:0;border-left:0}.card-group>.card:not(:last-child){border-top-right-radius:0;border-bottom-right-radius:0}.card-group>.card:not(:last-child) .card-img-top,.card-group>.card:not(:last-child) .card-header{border-top-right-radius:0}.card-group>.card:not(:last-child) .card-img-bottom,.card-group>.card:not(:last-child) .card-footer{border-bottom-right-radius:0}.card-group>.card:not(:first-child){border-top-left-radius:0;border-bottom-left-radius:0}.card-group>.card:not(:first-child) .card-img-top,.card-group>.card:not(:first-child) .card-header{border-top-left-radius:0}.card-group>.card:not(:first-child) .card-img-bottom,.card-group>.card:not(:first-child) .card-footer{border-bottom-left-radius:0}}.alert{--bs-alert-bg: transparent;--bs-alert-padding-x: 1rem;--bs-alert-padding-y: 1rem;--bs-alert-margin-bottom: 1rem;--bs-alert-color: inherit;--bs-alert-border-color: transparent;--bs-alert-border: 1px solid var(--bs-alert-border-color);--bs-alert-border-radius: 0.375rem;position:relative;padding:var(--bs-alert-padding-y) var(--bs-alert-padding-x);margin-bottom:var(--bs-alert-margin-bottom);color:var(--bs-alert-color);background-color:var(--bs-alert-bg);border:var(--bs-alert-border);border-radius:var(--bs-alert-border-radius)}.alert-heading{color:inherit}.alert-link{font-weight:700}.alert-dismissible{padding-right:3rem}.alert-dismissible .btn-close{position:absolute;top:0;right:0;z-index:2;padding:1.25rem 1rem}.alert-primary{--bs-alert-color: #314148;--bs-alert-bg: #dce2e4;--bs-alert-border-color: #cbd3d7}.alert-primary .alert-link{color:#27343a}.alert-secondary{--bs-alert-color: #192023;--bs-alert-bg: #d4d7d8;--bs-alert-border-color: #bfc3c4}.alert-secondary .alert-link{color:#141a1c}.alert-success{--bs-alert-color: #0f5132;--bs-alert-bg: #d1e7dd;--bs-alert-border-color: #badbcc}.alert-success .alert-link{color:#0c4128}.alert-info{--bs-alert-color: #055160;--bs-alert-bg: #cff4fc;--bs-alert-border-color: #b6effb}.alert-info .alert-link{color:#04414d}.alert-warning{--bs-alert-color: #664d03;--bs-alert-bg: #fff3cd;--bs-alert-border-color: #ffecb5}.alert-warning .alert-link{color:#523e02}.alert-danger{--bs-alert-color: #851a31;--bs-alert-bg: #f8d5dc;--bs-alert-border-color: #f5bfcb}.alert-danger .alert-link{color:#6a1527}.alert-light{--bs-alert-color: #5d5e5f;--bs-alert-bg: #fafbfb;--bs-alert-border-color: #f8f9fa}.alert-light .alert-link{color:#4a4b4c}.alert-dark{--bs-alert-color: #192023;--bs-alert-bg: #d4d7d8;--bs-alert-border-color: #bfc3c4}.alert-dark .alert-link{color:#141a1c}.media-landing .media-reference-copy{display:block;position:relative !important;top:auto;left:auto;width:auto;height:auto}.media-landing .media-reference-copy:after{content:"Afficher le média";background:rgba(255,255,255,.1);position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:#222;font-size:2em;font-weight:bold;text-shadow:0 0 5px #fff;backdrop-filter:blur(5px)}.media-landing .media-reference-copy img{width:auto !important;height:auto !important}</style><script type="application/ld+json"> { "@context": "https://schema.org", "@type": "WebSite", "name": "Encyclopædia Universalis", "alternateName": "Universalis", "url": "https://www.universalis.fr", "sameAs": [ "https://www.facebook.com/EncyclopedieUniversalis/", "https://www.linkedin.com/company/encyclopaedia-universalis", "https://www.twitter.com/universalisfr", "https://www.youtube.com/channel/UC0srTZiJaRaDw3fAvtCo4Ow" ] } </script> </head> <body id="page_3" class="edu SENIOR loading" > <div class="loader"></div> <a href="#main-content" id="skip"> <i aria-hidden="true" class="fa fa-fw fa-arrow-down"></i> Accéder au contenu </a> <header class="d-none d-md-block d-print-none"> <div class="container row-between"> <a class="header-logo mr-3" title="Retour à la page d'accueil" href="/"> <svg viewBox="0 0 370 76.44" height="70" width="277" id="logo-main"> <text class="fill-universalis text-darkblue" transform="translate(74.25 37.1)" font-family="Arial" font-size="43.37"> <tspan x="0" y="0">UNIVERSALIS</tspan> </text> <text class="text-darkblue subtitle" transform="translate(76.75 66.74)" font-family="Arial" font-size="35.8"> <tspan class="fill-universalis-up" x="0" y="0" font-size=".85em">.fr</tspan> </text> <g> <path class="fill-universalis-up" d="M57,6.36H4.25C1.9,6.36,0,8.27,0,10.62V62.51c0,2.35,1.9,4.25,4.25,4.25H57c2.35,0,4.25-1.9,4.25-4.25V10.62c0-2.35-1.9-4.25-4.25-4.25ZM29.63,31.87h7.33v8.06c-.77-1.77-1.61-2.99-2.96-4.38-1.41-1.44-2.42-2.35-4.36-3.29v-.39Zm2.37,29.2c-.85,.68-1.75,1.28-2.71,1.75-.11,.05-.22,.1-.33,.15H13.39c-1.67-.77-3.19-1.8-4.53-3.14-3.13-3.13-4.69-7.06-4.69-11.77s1.56-8.84,4.67-12.04c3.12-3.19,7.02-4.79,11.72-4.79,2.71,0,5.14,.49,7.3,1.43,1.81,.79,3.44,1.9,4.87,3.36,1.35,1.38,2.4,2.97,3.17,4.74,1,2.31,1.52,4.94,1.52,7.9l-.03,1.51H11.86c.37,2.25,1.36,4.04,2.95,5.37,1.6,1.33,3.64,1.99,6.13,1.99,2.79,0,4.96-.67,6.99-2.49l6.74,3.26c-.84,1.12-1.61,1.9-2.67,2.75Zm24.74-15.61c0,5.53-.44,9.31-1.31,11.35-1.07,2.49-2.64,4.39-4.72,5.72-.24,.15-.49,.3-.75,.44h-14.33c-.44-.23-.87-.49-1.26-.77-.26-.18-.43-.29-.66-.49,.29-.3,2.13-2.54,3.11-3.92,0,0-7.13-3.32-7.3-3.39-.22-1.04-.28-1.34-.44-2.83h7.98c.1,1.11,.27,1.26,.5,1.93,.41,1.15,1.07,2.05,1.97,2.69,.9,.64,2.02,.96,3.34,.96s2.45-.32,3.37-.95c.92-.63,1.61-1.55,2.06-2.78,.33-.91,.5-2.86,.5-5.85v-15.51h7.95v13.42Z"/> <path class="fill-universalis-up" d="M29.44,43.92c-.32-1.09-.87-2.04-1.58-2.88-.44-.52-.93-1-1.52-1.43-1.54-1.11-3.34-1.66-5.38-1.66-2.22,0-4.16,.62-5.83,1.86-1.05,.78-2.02,2.14-2.92,4.11H29.44Z"/> </g> </svg> </a> <div class="p-1 d-flex justify-content-end flex-column" style="height: 80px"> <div class="user-welcome"></div> <div class="login-form-wrapper" style="align-items: flex-end; display: flex; flex-direction: column" data-identification_uri="/identification/"> <div class="login-form"> <div class="btn btn-sm btn-primary keep-label-space-top"> <i aria-hidden="true" class="fa fa-user"></i> Mon Compte </div> </div> </div> <div id="toast-manager"></div> </div> </div> </header> <div class="d-print-none sticky-top"> <div role="navigation" aria-label="Navigation mobile" class="main-navbar-wrapper shadow"> <a class="navbar-brand-md d-none d-md-block" href="/"> <img alt="Universalis" src=" /typo3temp/assets/_processed_/e/b/csm_eu-blanc-2x_3bdd01b6ad.webp " width="32" height="32" alt=""> </a> <div class="container"> <nav class="navbar navbar-expand-lg navbar-dark"> <a class="navbar-brand d-md-none" href="/"> <img alt="Universalis" src=" /typo3temp/assets/_processed_/e/b/csm_eu-blanc-2x_3bdd01b6ad.webp " width="36" height="36" alt=""> </a> <div id="navbar-collapse-grid" class="navbar-collapse collapse pt-2 pt-md-0"> <ul class="navbar-nav me-auto"> <li><a href="/" title="Niveaux" class="nav-link">Accueil</a></li> <li><a href="/atlas/" title="Atlas" class="nav-link">Atlas</a></li><li><a href="/datapays/" title="DataPays" class="nav-link">DataPays</a></li><li><a href="/classification/" title="Classification" class="nav-link">Classification</a></li><li><a href="/dictionnaire/" title="Dictionnaire français Universalis : retrouvez toutes les définitions, étymologies, expressions, synonymes, exemples, et flexions de plus de 120 000 mots de la langue française." class="nav-link">Dictionnaire</a></li><li><a href="https://boutique.universalis.fr" title="Boutique" class="nav-link">Boutique</a></li> </ul> </div> <form method="get" name="searchQuery" class="flex-grow-1 my-1" id="search-form" autocomplete="off" action="/recherche/redirect/"> <div> <input type="hidden" name="tx_solrdata_pi1[__referrer][@extension]" value="SolrData" /> <input type="hidden" name="tx_solrdata_pi1[__referrer][@controller]" value="SearchForm" /> <input type="hidden" name="tx_solrdata_pi1[__referrer][@action]" value="showFr" /> <input type="hidden" name="tx_solrdata_pi1[__referrer][arguments]" value="YTowOnt9789d077876a7a0adeb4a9a4c4853f315af9bb201" /> <input type="hidden" name="tx_solrdata_pi1[__referrer][@request]" value="{"@extension":"SolrData","@controller":"SearchForm","@action":"showFr"}db953a457671272659a1e7710096726899d321a7" /> <input type="hidden" name="tx_solrdata_pi1[__trustedProperties]" value="{"data-action":1,"searchQuery":{"resultType":1,"searchedString":1}}36e15bfcc110b23d6ba91a6810381c8ec6b87146" /> </div> <input type="hidden" name="tx_solrdata_pi1[data-action]" value="https://www.universalis.fr/recherche/___searchedString___/article/1/" /> <input type="hidden" name="tx_solrdata_pi1[searchQuery][resultType]" value="ARTICLE" /> <div class="input-wrapper input-group"> <input placeholder="Rechercher sur Universalis" class="form-control" id="searchedString" autocomplete="off" type="text" name="tx_solrdata_pi1[searchQuery][searchedString]" value="" /> <button type="submit" class="btn btn-sm btn-light"> <span class="d-none d-md-block">Recherche</span> <span class="visually-hidden">Recherche</span> <span class="d-md-none"> <i aria-hidden="true" class="fa fa-fw fa-magnifying-glass"></i></span> </button> </div> </form> <button title="Afficher / masquer le menu du site" class="navbar-toggler ms-1" type="button" data-bs-toggle="collapse" data-bs-target="#navbar-collapse-grid"> <span class="navbar-toggler-icon"></span> </button> </nav> </div> </div> </div> <main class="site-fr container main rounded-bottom shadow mb-3"> <div class="user-welcome"></div> <div class="login-form-wrapper-mobile"> <div class="login-form"> <div class="btn btn-sm btn-primary keep-label-space-top"> <i aria-hidden="true" class="fa fa-user"></i> Mon Compte </div> </div> </div> <div id="ad_topslot" class="pub-container text-center"> <div class="pub-placeholder"></div> </div> <div class="d-lg-none text-center mb-3"> <a href="/abonnement" title="Je m'abonne" data-matomo-category="CTA" data-matomo-name="Clic" data-matomo-value="Top (mobile)"> <img src="/typo3temp/assets/_processed_/1/6/csm_banner-cta_4de68c3a6b.webp" width="728" height="90" alt="Abonnez-vous à Universalis pour 1 euro" class="img-max shadow-sm"/> </a> </div> <div class="row"> <div id="main-content" class="col-lg-8 col-xl-9 pb-4"> <div class="free-toc-container"> <ul id="free-toc" class="collapse list-group shadow-sm mb-1" style="overflow: hidden"> <li class="list-group-item active"> <a class="d-block" title="DELTAS, Les deltas continentaux" href="/encyclopedie/deltas/"> 1. Les deltas continentaux </a> </li> <li class="list-group-item "> <a class="d-block" title="DELTAS, Les deltas sous-marins profonds, ou « deep-sea fans »" href="/encyclopedie/deltas/2-les-deltas-sous-marins-profonds-ou-deep-sea-fans/"> 2. Les deltas sous-marins profonds, ou « deep-sea fans » </a> </li> <li class="list-group-item "> <a class="d-block" title="DELTAS, Bibliographie" href="/encyclopedie/deltas/3-bibliographie/"> 3. Bibliographie </a> </li> </ul> <button class="btn btn-sm btn-universalis" data-bs-toggle="collapse" data-bs-target="#free-toc" aria-expanded="false" title="Afficher / masquer le sommaire"> <i aria-hidden="true" class="fa fa-fw fa-eye"></i> Sommaire </button> </div> <h1 class="mb-1"> <strong>DELTAS</strong> </h1> <ul class="pagination justify-content-center public-links "><li class="page-item active"><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 1" class="page-link" title="Abonnez-vous" data-loaded="true">1</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 2" class="page-link" title="Abonnez-vous" data-loaded="true">2</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 3" class="page-link" title="Abonnez-vous" data-loaded="true">3</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 4" class="page-link" title="Abonnez-vous" data-loaded="true">4</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 5" class="page-link" title="Abonnez-vous" data-loaded="true">5</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 6" class="page-link" title="Abonnez-vous" data-loaded="true">6</a></li></ul><div class="content paged type-article" ><div class="block_1" data-ucode="yG920003_0"><i class="anchor" id="yG920003_0"></i><div class="clearfix"></div><div class="media-container float-md-start me-2 col-md-3 text-center"><figure class="figure text-center w-100 mb-0 p-1" style="position: relative"><a data-ucode="PA082985" data-showMediaPlayer="1" class="protected media-reference-copy " title="Média : Delta du Mékong" href="/media/delta-du-mekong-pa082985/"><img id="PA082985" loading="lazy" src="/typo3temp/assets/_processed_/7/c/csm_pa082985_cda3fee27c.webp" class="figure-img rounded mx-auto media_resized" alt="Delta du Mékong - crédits : M. Gifford - De Wys Inc." data-description="Le delta du Mékong dans le sud du Vietnam, avant que le fleuve se jette dans la mer de Chine méridionale." data-copyright="M. Gifford - De Wys Inc." width="540" height="800" /></a><figcaption class="figure-caption"><p class="m-0 mt-1 fw-bold text-gray-700 text-truncate"> Delta du Mékong </p><p class="m-0 copyright text-sm text-gray-700 text-truncate"> M. Gifford - De Wys Inc. </p></figcaption></figure></div><p>Les deltas, dont la morphologie et la structure deviennent de mieux en mieux connues grâce aux images fournies par les satellites d'observation de la Terre et aux <a data-bs-toggle="popover" data-bs-content="On appelle forage l'ensemble des opérations permettant le creusement de trous généralement verticaux. L'utilisation principale des forages est la reconnaissance et l' exploitation des gisements de pétrole ou de gaz naturel . Les autres utilisations, qui sont nombreuses, comprennent notamment : les forages géologiques ou géophysiques pour la reconnaissance des gisements de minerais ; l..." title="Article : FORAGES" href="/encyclopedie/forages/">forages</a> pétroliers, ne se limitent pas aux constructions sédimentaires littorales classiques. Il existe en effet d'autres types de deltas, liés à des constructions sédimentaires sous-marines profondes, beaucoup plus étendus que les deltas continentaux ; il s'agit des <em>deep-sea fans</em>, ou éventails sédimentaires profonds.</p><div class="clearfix"></div></div><div class="block_1" data-ucode="yG920003_1"><i class="anchor" id="yG920003_1"></i><h2>Les deltas continentaux</h2><p>Les deltas continentaux peuvent être définis d'une manière très générale comme des constructions sédimentaires élaborées au débouché des cours d'eau dans des étendues d'eau permanentes. L'origine du mot delta remonte au <span class="pc">v</span><sup>e</sup> siècle avant J.-C. : il a été utilisé pour la première fois par Hérodote pour désigner la plaine alluviale du <a data-bs-toggle="popover" data-bs-content="Avec ses 6 671 kilomètres, depuis son affluent le plus lointain, la Luvironza en Tanzanie , et 6 058 kilomètres depuis le lac Victoria, le Nil prend rang, aux côtés de l' Amazone et de l'ensemble Mississippi-Missouri, parmi les trois plus longs fleuves du monde. Son bassin draine 3 millions de kilomètres carrés, un dixième du continent africain réparti entre deux grands ense..." title="Article : NIL" href="/encyclopedie/nil/">Nil</a>, dont la forme évoque la lettre grecque Δ (delta majuscule). Les deltas résultent du dépôt des particules transportées par les cours d'eau lors de leur irruption dans un bassin de réception, par suite de processus de perte de charge. Lorsqu'il y a contact entre deux milieux de salinité différente, ces processus peuvent être accompagnés de phénomènes de floculation responsables de l'agrégation des particules colloïdales en suspension puis de leur dépôt sous forme d'argile. Les contrastes de salinité entre le cours d'eau et le bassin de réception conditionnent également la forme primaire des accumulations deltaïques ; en effet, ils impliquent des différences de densité et régissent de ce fait, au même titre que la température et la turbidité, la miscibilité des eaux.</p><p>Trois cas peuvent schématiquement se présenter. On peut d'abord envisager le cas où la densité des eaux du cours d'eau est supérieure à celle du bassin de réception. Dans la nature, c'est le cas général des torrents de montagne très chargés en particules et débouchant dans des <a data-bs-toggle="popover" data-bs-content="L'étude scientifique des lacs, et, par extension, des étangs, mares, marais et lagunes, fait l'objet d'une discipline appelée limnologie. Ainsi, ce terme que créa en 1892 le Suisse F. A. Forel et qu'il a défini comme l'« océanographie des lacs » désigne aujourd'hui l'étude statique et dynamique des eaux continentales ou intérieures séparées du monde océanique. La caractér..." title="Article : LACS" href="/encyclopedie/lacs/">lacs</a>. Seule une petite partie de la charge solide participe alors à la construction du delta d' embouchure aérien, le plus souvent de taille modeste et dont la forme est allongée dans le sens de l'émissaire. Mais l'essentiel de cette charge est transporté par une veine d'eau qui se propage au contact du fond sous forme d'un courant de turbidité qui peut se déplacer sur une très longue distance avant de libérer sa charge. Son délestage aboutit alors à une accumulation sédimentaire sous-aquatique en forme d'éventail. Tel est le cas notamment du <a data-bs-toggle="popover" data-bs-content="Du Valais suisse à la Camargue française, sur 812 kilomètres, le Rhône draine un bassin de 98 000 kilomètres carrés qui, traversant une région montagneuse soumise en partie aux influences méditerranéennes, lui vaut une variété de régimes unique au monde. Surtout alpestre, la chaîne et son rameau le Jura couvrent 64 500 kilomètres carrés ou les deux tiers de la surface r�..." title="Article : RHÔNE" href="/encyclopedie/rhone/">Rhône</a> débouchant dans le lac Léman, ou du Colorado dans le lac de barrage Mead. Dans un deuxième cas, la densité des eaux de l'émissaire est voisine de celle des eaux du bassin de réception (dans la nature, ce cas est représenté par exemple par le fleuve Terek se jetant dans la mer Caspienne). La pénétration du cours d'eau dans le bassin se fait alors sur un très large front, et ses eaux, parfaitement miscibles avec celles du bassin, sont fortement ralenties. Les sédiments sont déposés le long d'un arc enveloppant l'embouchure et tendant à l'obturer. De nouveaux chenaux sont alors créés puis obturés de la même façon. À un stade avancé de ce processus, un cône sédimentaire à front arqué est élaboré. Dans un dernier cas, enfin, la densité des eaux de l'émissaire est inférieure à celle du bassin de réception. Ce cas, très général puisqu'il s'applique à la plupart des <a data-bs-toggle="popover" data-bs-content="Les fleuves, et les cours d'eau en général, ont toujours tenu une grande place dans la vie des hommes et leurs préoccupations. Les civilisations anciennes, désarmées devant leur puissance de destruction et ne pouvant ni expliquer ni prévoir leur comportement, les ont divinisés et implorés. L'homme moderne a entrepris de les étudier (potamologie), de comprendre les lois de leur écoulement..." title="Article : FLEUVES" href="/encyclopedie/fleuves/">fleuves</a> débouchant dans la mer, est celui que nous considérerons par la suite.</p><p>Ces deltas installés à la limite du domaine marin ont ceci de particulier qu'ils représentent le plus souvent le résultat d'un conflit entre les phénomènes d'accumulation par le cours d'eau et de destruction par les agents hydrodynamiques liés au bassin de réception (courants de marée, de dérive littorale, vagues, etc). On<a href="javascript:" title="Lire la suite" class="read-more ms-1">[...]</a></p></div><div class="clearfix"></div></div><ul class="pagination justify-content-center public-links "><li class="page-item active"><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 1" class="page-link" title="Abonnez-vous" data-loaded="true">1</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 2" class="page-link" title="Abonnez-vous" data-loaded="true">2</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 3" class="page-link" title="Abonnez-vous" data-loaded="true">3</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 4" class="page-link" title="Abonnez-vous" data-loaded="true">4</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 5" class="page-link" title="Abonnez-vous" data-loaded="true">5</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 6" class="page-link" title="Abonnez-vous" data-loaded="true">6</a></li></ul><div class="folio-block"><p class="folio-block-title text-center text-uc"><strong>La suite de cet article est accessible aux abonnés</strong></p><ul class="list-unstyled"><li><i class="fa fa-fw fa-check-circle"></i> Des contenus variés, complets et fiables</li><li><i class="fa fa-fw fa-check-circle"></i> Accessible sur tous les écrans</li><li><i class="fa fa-fw fa-check-circle"></i> Pas de publicité</li></ul><p class="text-center"><a href="/abonnement/" class="btn btn-cta text-uc" id="folio-button" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="Block bottom">Découvrez nos offres </a></p><p class="text-center text-sm"> Déjà abonné ? <a href="/identification/" id="folio-login">Se connecter</a></p></div><div id="ad_mpuslot" class="pub-container text-center"><div class="pub-placeholder"></div></div><section class="mt-3 mb-5"><i class="anchor" id="G920003_AUTHORS"></i><p class="title-minor">Écrit par</p><ul class="list-group"><li class="list-group-item" data-dc-author="BELLAICHE, Gilbert"><a title="Auteur : Gilbert BELLAICHE" rel="author" href="/auteurs/gilbert-bellaiche/"><strong>Gilbert BELLAICHE</strong></a> : directeur de recherche au C.N.R.S. </li></ul></section><section class="mb-5"><div class="text-center mb-3 d-print-none"><a class="d-inline-flex flex-row justify-content-center align-items-center btn btn-light btn-large text-start" title="Carte mentale : DELTAS" href="/carte-mentale/deltas/"><i class="fa fa-sitemap fa-rotate-270 me-1 fs-1 text-universalis"></i><p class="m-0"><strong class="fs-4">Carte mentale</strong><br /> Élargissez votre recherche dans Universalis </p></a></div></section> <section class="mb-5 article-classification" data-print-label="la classification" data-print-target=".article-classification"> <i class="anchor" id="yG920003_ROOT_LINES"></i> <p class="title-minor">Classification</p> <nav aria-label="Classification 1"> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a title="Classification : Géographie" href="/classification/geographie/"> Géographie </a> </li> <li class="breadcrumb-item"> <a title="Classification : Géographie physique" href="/classification/geographie/geographie-physique/"> Géographie physique </a> </li> <li class="breadcrumb-item"> <a title="Classification : Hydrographie" href="/classification/geographie/geographie-physique/hydrographie/"> Hydrographie </a> </li> <li class="breadcrumb-item"> <a title="Classification : Hydrographie continentale" href="/classification/geographie/geographie-physique/hydrographie/hydrographie-continentale/"> Hydrographie continentale </a> </li> <li class="breadcrumb-item active" data-dc-subject="Fleuves et rivières"> <a title="Classification : Fleuves et rivières" href="/classification/geographie/geographie-physique/hydrographie/hydrographie-continentale/fleuves-et-rivieres/"> Fleuves et rivières </a> </li> </ol> </nav> <nav aria-label="Classification 2"> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a title="Classification : Sciences de la Terre" href="/classification/sciences-de-la-terre/"> Sciences de la Terre </a> </li> <li class="breadcrumb-item"> <a title="Classification : Géologie" href="/classification/sciences-de-la-terre/geologie/"> Géologie </a> </li> <li class="breadcrumb-item"> <a title="Classification : Sédimentologie" href="/classification/sciences-de-la-terre/geologie/sedimentologie/"> Sédimentologie </a> </li> <li class="breadcrumb-item"> <a title="Classification : Érosion et sédimentation, géologie" href="/classification/sciences-de-la-terre/geologie/sedimentologie/erosion-et-sedimentation-geologie/"> Érosion et sédimentation, géologie </a> </li> <li class="breadcrumb-item active" data-dc-subject="Érosion et sédimentation littorale et sous-marine"> <a title="Classification : Érosion et sédimentation littorale et sous-marine" href="/classification/sciences-de-la-terre/geologie/sedimentologie/erosion-et-sedimentation-geologie/erosion-et-sedimentation-littorale-et-sous-marine/"> Érosion et sédimentation littorale et sous-marine </a> </li> </ol> </nav> <nav aria-label="Classification 3"> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a title="Classification : Sciences de la Terre" href="/classification/sciences-de-la-terre/"> Sciences de la Terre </a> </li> <li class="breadcrumb-item"> <a title="Classification : Géologie" href="/classification/sciences-de-la-terre/geologie/"> Géologie </a> </li> <li class="breadcrumb-item"> <a title="Classification : Géomorphologie" href="/classification/sciences-de-la-terre/geologie/geomorphologie/"> Géomorphologie </a> </li> <li class="breadcrumb-item active" data-dc-subject="Géomorphologie du littoral"> <a title="Classification : Géomorphologie du littoral" href="/classification/sciences-de-la-terre/geologie/geomorphologie/geomorphologie-du-littoral/"> Géomorphologie du littoral </a> </li> </ol> </nav> <nav aria-label="Classification 4"> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a title="Classification : Sciences de la Terre" href="/classification/sciences-de-la-terre/"> Sciences de la Terre </a> </li> <li class="breadcrumb-item"> <a title="Classification : Hydrologie continentale" href="/classification/sciences-de-la-terre/hydrologie-continentale/"> Hydrologie continentale </a> </li> <li class="breadcrumb-item"> <a title="Classification : Hydrologie fluviale ou potamologie" href="/classification/sciences-de-la-terre/hydrologie-continentale/hydrologie-fluviale-ou-potamologie/"> Hydrologie fluviale ou potamologie </a> </li> <li class="breadcrumb-item active" data-dc-subject="Géomorphologie fluviale"> <a title="Classification : Géomorphologie fluviale" href="/classification/sciences-de-la-terre/hydrologie-continentale/hydrologie-fluviale-ou-potamologie/geomorphologie-fluviale/"> Géomorphologie fluviale </a> </li> </ol> </nav> <nav aria-label="Classification 5"> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a title="Classification : Sciences de la Terre" href="/classification/sciences-de-la-terre/"> Sciences de la Terre </a> </li> <li class="breadcrumb-item"> <a title="Classification : Océanographie" href="/classification/sciences-de-la-terre/oceanographie/"> Océanographie </a> </li> <li class="breadcrumb-item"> <a title="Classification : Géologie marine" href="/classification/sciences-de-la-terre/oceanographie/geologie-marine/"> Géologie marine </a> </li> <li class="breadcrumb-item active" data-dc-subject="Géologie du littoral"> <a title="Classification : Géologie du littoral" href="/classification/sciences-de-la-terre/oceanographie/geologie-marine/geologie-du-littoral/"> Géologie du littoral </a> </li> </ol> </nav> <nav aria-label="Classification 6"> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a title="Classification : Sciences de la Terre" href="/classification/sciences-de-la-terre/"> Sciences de la Terre </a> </li> <li class="breadcrumb-item"> <a title="Classification : Géologie" href="/classification/sciences-de-la-terre/geologie/"> Géologie </a> </li> <li class="breadcrumb-item"> <a title="Classification : Géomorphologie" href="/classification/sciences-de-la-terre/geologie/geomorphologie/"> Géomorphologie </a> </li> <li class="breadcrumb-item active" data-dc-subject="Géomorphologie sous-marine"> <a title="Classification : Géomorphologie sous-marine" href="/classification/sciences-de-la-terre/geologie/geomorphologie/geomorphologie-sous-marine/"> Géomorphologie sous-marine </a> </li> </ol> </nav> <nav aria-label="Classification 7"> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a title="Classification : Sciences de la Terre" href="/classification/sciences-de-la-terre/"> Sciences de la Terre </a> </li> <li class="breadcrumb-item"> <a title="Classification : Océanographie" href="/classification/sciences-de-la-terre/oceanographie/"> Océanographie </a> </li> <li class="breadcrumb-item"> <a title="Classification : Géologie marine" href="/classification/sciences-de-la-terre/oceanographie/geologie-marine/"> Géologie marine </a> </li> <li class="breadcrumb-item active" data-dc-subject="Géologie sous-marine"> <a title="Classification : Géologie sous-marine" href="/classification/sciences-de-la-terre/oceanographie/geologie-marine/geologie-sous-marine/"> Géologie sous-marine </a> </li> </ol> </nav> </section> <section class="mb-5 d-print-none"> <i class="anchor" id="yG920003_MEDIAS"></i> <p class="title-minor">Médias</p> <div class="row"> <div class="col-12 col-md-6 text-center p-1"> <figure class="figure text-center w-100 mb-0 p-1" style="position: relative"> <a data-ucode="PA082985" data-showMediaPlayer="1" class="protected media-reference-copy " title="Média : Delta du Mékong" href="/media/delta-du-mekong-pa082985/"> <img id="PA082985" loading="lazy" src="/typo3temp/assets/_processed_/7/c/csm_pa082985_cda3fee27c.webp" class="figure-img rounded mx-auto media_resized" alt="Delta du Mékong - crédits : M. Gifford - De Wys Inc." data-description="Le delta du Mékong dans le sud du Vietnam, avant que le fleuve se jette dans la mer de Chine méridionale." data-copyright="M. Gifford - De Wys Inc." width="540" height="800" /> </a> <figcaption class="figure-caption"> <p class="m-0 mt-1 fw-bold text-gray-700 text-truncate"> Delta du Mékong </p> <p class="m-0 copyright text-sm text-gray-700 text-truncate"> M. Gifford - De Wys Inc. </p> </figcaption> </figure> </div> <div class="col-12 col-md-6 text-center p-1"> <figure class="figure text-center w-100 mb-0 p-1" style="position: relative"> <a data-ucode="V070141" data-showMediaPlayer="1" class="protected media-reference-copy " title="Média : Diagramme de Galloway" href="/media/diagramme-de-galloway-v070141/"> <img id="V070141" loading="lazy" src="/typo3temp/assets/_processed_/0/3/csm_v070141_4810ded8fc.webp" class="figure-img rounded mx-auto media_resized" alt="Diagramme de Galloway - crédits : Encyclopædia Universalis France" data-description="Diagramme de Galloway illustrant la classification des différents deltas." data-copyright="Encyclopædia Universalis France" width="2000" height="1820" /> </a> <figcaption class="figure-caption"> <p class="m-0 mt-1 fw-bold text-gray-700 text-truncate"> Diagramme de Galloway </p> <p class="m-0 copyright text-sm text-gray-700 text-truncate"> Encyclopædia Universalis France </p> </figcaption> </figure> </div> </div> </section> <section class="mb-5 d-print-none learn-more"> <i class="anchor" id="yG920003_REFERENCES"></i> <p class="title-minor">Autres références</p> <ul class="list-group"> <li class="list-group-item"> <h3 class="fs-5 m-0 mt-1"> <a href="/encyclopedie/accumulations-geologie-accumulations-continentales/#c23459"> <span class="rg">ACCUMULATIONS </span><span class="rm">(géologie) - Accumulations continentales</span> </a> </h3> <ul class="list-inline list-inline-bullet mb-1 text-muted"> <li class="list-inline-item text-sm">Écrit par <span rel="author">Roger COQUE</span> </li> <li class="list-inline-item text-sm">5 056 mots</li> <li class="list-inline-item text-sm">12 médias </li> </ul> <div class="d-none d-md-inline-block float-start me-3"> <a class="protected" title="Article : ACCUMULATIONS (g&eacute;ologie) - Accumulations continentales" href="/encyclopedie/accumulations-geologie-accumulations-continentales/"> <img class="rounded shadow" loading="lazy" alt="Orogenèse - crédits : Encyclopædia Universalis France" width="125" height="125" src="/typo3temp/assets/_processed_/a/e/csm_v010120c_08ea78f016.webp"/> </a> </div> <div class="snippet-content mt-3"> ...construction de formes d'accumulation typiques, car l'écoulement et le transport cessent, progressivement, en raison de l'insignifiance croissante de la pente. Ainsi se développent les <em>deltas</em> aux <a data-bs-toggle="popover" data-bs-content="L' embouchure d'un cours d'eau est le lieu où il déverse dans la mer ou dans un lac ses eaux et sa charge solide. L'interaction entre l'écoulement à sens unique du fleuve et les mouvements alternatifs de la mer y détermine des rapports particuliers entre les masses d'eau, et des formes spécifiques d'érosion et de sédimentation. Sur la plupart des côtes, les embouchures occupent leur ..." title="Article : EMBOUCHURES" href="/encyclopedie/embouchures/">embouchures</a> des fleuves et des rivières, en progression plus ou moins rapide vers la mer et de types variés, selon... </div> </li> <li class="list-group-item"> <h3 class="fs-5 m-0 mt-1"> <a href="/encyclopedie/asie-geographie-humaine-et-regionale-dynamiques-regionales/#c23459"> <span class="rg">ASIE </span><span class="rm">(Géographie humaine et régionale) - Dynamiques régionales</span> </a> </h3> <ul class="list-inline list-inline-bullet mb-1 text-muted"> <li class="list-inline-item text-sm">Écrit par <span rel="author">Manuelle FRANCK</span> , <span rel="author">Bernard HOURCADE</span> , <span rel="author">Georges MUTIN</span> , <span rel="author">Philippe PELLETIER</span> et <span rel="author">Jean-Luc RACINE</span> </li> <li class="list-inline-item text-sm">24 799 mots</li> <li class="list-inline-item text-sm">10 médias </li> </ul> <div class="d-none d-md-inline-block float-start me-3"> <a class="protected" title="Article : ASIE (G&eacute;ographie humaine et r&eacute;gionale) - Dynamiques r&eacute;gionales" href="/encyclopedie/asie-geographie-humaine-et-regionale-dynamiques-regionales/"> <img class="rounded shadow" loading="lazy" alt="Asie du Sud-Est : dynamiques transnationales - crédits : Encyclopædia Universalis France" width="125" height="125" src="/typo3temp/assets/_processed_/a/3/csm_ca070380_a90de5ee3a.webp"/> </a> </div> <div class="snippet-content mt-3"> ...vocation agraire. D'abord situés au cœur des plaines, les centres de gravité politiques et économiques se rapprochent des côtes puis basculent vers les deltas des grands fleuves à partir du <span class="pc">xviii</span><sup>e</sup> siècle, un processus de littoralisation, amorcé ou consolidé par la colonisation, lié à l'importance croissante... </div> </li> <li class="list-group-item"> <h3 class="fs-5 m-0 mt-1"> <a href="/encyclopedie/camargue/"> <span class="rg">CAMARGUE</span> </a> </h3> <ul class="list-inline list-inline-bullet mb-1 text-muted"> <li class="list-inline-item text-sm">Écrit par <span rel="author">Lucien TIRONE</span> </li> <li class="list-inline-item text-sm">1 024 mots</li> <li class="list-inline-item text-sm">3 médias </li> </ul> <div class="d-none d-md-inline-block float-start me-3"> <a class="protected" title="Article : CAMARGUE" href="/encyclopedie/camargue/"> <img class="rounded shadow" loading="lazy" alt="Roseaux - crédits : Gerard Sioen/ Gamma-Rapho/ Getty Images" width="125" height="125" src="/typo3temp/assets/_processed_/a/0/csm_ph996426_c60d54a98a.webp"/> </a> </div> <div class="snippet-content mt-3"> <p> Région de France située en Provence, la Camargue est formée par le delta du <a data-bs-toggle="popover" data-bs-content="Du Valais suisse à la Camargue française, sur 812 kilomètres, le Rhône draine un bassin de 98 000 kilomètres carrés qui, traversant une région montagneuse soumise en partie aux influences méditerranéennes, lui vaut une variété de régimes unique au monde. Surtout alpestre, la chaîne et son rameau le Jura couvrent 64 500 kilomètres carrés ou les deux tiers de la surface r�..." title="Article : RHÔNE" href="/encyclopedie/rhone/">Rhône</a>. Celui-ci commence en amont d'<a data-bs-toggle="popover" data-bs-content="La cité d'Arles est née au bord du grand Rhône , sur un rocher calcaire qui dominait une plaine alluviale marécageuse (son nom, Arelate, signifiait la ville des marais). Elle se situe au carrefour de routes terrestres et de la voie fluviale (pont sur le Rhône). Le rôle de place de commerce s'affirme à l'époque romaine, du règne d'Auguste à celui de Constantin, qui s'y installe en 305 et..." title="Article : ARLES" href="/encyclopedie/arles/">Arles</a>. Le fleuve se divise alors en deux bras : le grand Rhône qui se dirige vers le sud-est ; le petit Rhône vers le sud-ouest. Ces deux bras délimitent le territoire de Camargue....</p> </div> </li> <li class="list-group-item"> <h3 class="fs-5 m-0 mt-1"> <a href="/encyclopedie/chine-les-regions-chinoises/#c23459"> <span class="rg">CHINE - </span><span class="rm">Les régions chinoises</span> </a> </h3> <ul class="list-inline list-inline-bullet mb-1 text-muted"> <li class="list-inline-item text-sm">Écrit par <span rel="author">Pierre TROLLIET</span> </li> <li class="list-inline-item text-sm">11 778 mots</li> <li class="list-inline-item text-sm">3 médias </li> </ul> <div class="d-none d-md-inline-block float-start me-3"> <a class="protected" title="Article : CHINE - Les r&eacute;gions chinoises" href="/encyclopedie/chine-les-regions-chinoises/"> <img class="rounded shadow" loading="lazy" alt="Relief karstique, Yunnan - crédits : Tony Waitham/ robertharding/ Getty Images" width="125" height="125" src="/typo3temp/assets/_processed_/5/6/csm_pa083412_b9bc8fc715.webp"/> </a> </div> <div class="snippet-content mt-3"> Au niveau de cette ville, ledelta commence, immense plaine absolument plate, qui constitue la presque totalité de la province de Jiangsu. La pente du fleuve, très profondément incise, avec 40 mètres à Nankin, est extrêmement faible. À 330 kilomètres de la mer, elle est de 1 millimètre par kilomètre.... </div> </li> <li class="list-unstyled text-center mt-3"> <a class="btn btn-sm btn-primary" title="Afficher la liste complète des références" rel="related" href="/index/deltas/"> Afficher les 27 références <i aria-hidden="true" class="fa fa-fw fa-chevron-right"></i> </a> </li> </ul> </section> </div> <div class="col-lg-4 col-xl-3 px-0 d-none d-lg-block side-bar position-relative"> <div id="ad_rightslot" class="pub-container text-center"> <div class="pub-placeholder"></div> </div> <div id="ad_rightslot2" class="pub-container text-center"> <div class="pub-placeholder"></div> </div> <a class="wrapper cta" href="/abonnement" title="Abonnez-vous à Universalis pour 1 euro" data-matomo-category="CTA" data-matomo-name="Clic" data-matomo-value="Col right"> <img src="/typo3temp/assets/_processed_/b/6/csm_abo-3_f303c484f7.webp" class="full-height" loading="lazy" width="290" height="476" alt="Abonnez-vous à Universalis pour 1 euro"> </a> <div id="newsletter_subscription" class="wrapper p-3"> <p class="fs-3 fw-bold text-center text-light mb-1">Rejoignez-nous</p> <p class="text-center"> Inscrivez-vous à notre <strong>newsletter</strong></p> <div class="input-group mb-3"> <input type="text" class="form-control" placeholder="votre email"> <div class="input-group-append"> <button id="newsletter_subscription_button" class="btn btn-primary text-uppercase" type="button"> <strong>S'inscrire</strong></button> </div> </div> </div> </div> </div> </main> <div id="bandeau-footer"> <div class="container"> <p><a href="/abonnement" title="Abonnez-vous à Universalis pour 1 euro">Accédez à l'intégralité d'Universalis.fr <strong>sans publicité</strong></a></p> </div> </div> <footer class="container footer text-center d-print-none"> <ul class="list-inline list-inline-bullet mb-2"> <li class="list-inline-item"> <a href="http://www.encyclopaedia-universalis.fr/" title="Encyclopædia Universalis" rel="noopener" target="_blank">Encyclopædia Universalis </a> </li> <li class="list-inline-item"> <a href="https://www.encyclopaedia-universalis.fr/nous-contacter/infos/" title="Contactez-nous" rel="noopener nofollow" target="_blank">Contact</a></li> <li class="list-inline-item"> <a title="Mentions légales" rel="nofollow" href="/mentions-legales/">Mentions légales et politique de confidentialité</a> </li> <li class="list-inline-item"> <a href="https://abonnement.universalis.fr/typo3conf/ext/mailer/Resources/Public/Pdf/cgv.pdf" rel="noopener nofollow" target="_blank" title="Conditions générales de vente">CGV</a> </li> <li class="list-inline-item d-none d-md-inline-block"> <a href="javascript:" id="rgpd" rel="nofollow" title="Consentement RGPD">RGPD</a> </li> </ul> <p class="mb-2">Consulter le <a title="Dictionnaire de l'Encyclopædia Universalis" href="/dictionnaire/"> dictionnaire de l'Encyclopædia Universalis </a> </p> <p class="mb-3">© 2024 Encyclopædia Universalis France. Tous droits de propriété industrielle et intellectuelle réservés.</p> </footer> <a href="javascript:" class="btn btn-primary" id="back-to-top" title="Retour en haut de page"><i aria-hidden="true" class="far fa-arrow-up"></i></a> <script> // noinspection ES6ConvertVarToLetConst,JSUnusedGlobalSymbols var subscription_uri = 'https://www.universalis.fr/abonnement/' bodyLoaded = true; loaded(); </script> <script>(()=>{var e,a,r,_,d,c={},b={};function __webpack_require__(e){var a=b[e];if(void 0!==a)return a.exports;var r=b[e]={id:e,loaded:!1,exports:{}};return c[e].call(r.exports,r,r.exports,__webpack_require__),r.loaded=!0,r.exports}__webpack_require__.m=c,__webpack_require__.n=e=>{var a=e&&e.__esModule?()=>e.default:()=>e;return __webpack_require__.d(a,),a},__webpack_require__.d=(e,a)=>{for(var r in a)__webpack_require__.o(a,r)&&!__webpack_require__.o(e,r)&&Object.defineProperty(e,r,{enumerable:!0,get:a[r]})},__webpack_require__.f={},__webpack_require__.e=e=>Promise.all(Object.keys(__webpack_require__.f).reduce(((a,r)=>(__webpack_require__.f[r](e,a),a)),[])),__webpack_require__.u=e=>"js/"+e+"."+{13:"80d7e21db2f95ae99720",26:"378d7d0789f5af40346c",32:"f20d73ca82d98e7527c8",69:"7313a4f3fed161acce4b",89:"c626d929711e7d9749bb",596:"f42a3891c8a58bdfb96a",603:"ea3de1982fc803344bdd",689:"31c396836cb7e99e178d",709:"d4e0658f463af05ae223",897:"3e91b02003555b671e4b",1095:"9e59e92f30df1ec926e4",1203:"76e8c707d971e06822da",1250:"9865f41df828b2e8b447",1292:"93adae3e6784d8a8a976",1349:"9efae443d9392248187c",1377:"446728afc62ef1c19520",1394:"86027a2d101b1eb260c8",1419:"1387d471be2d6ae0a0aa",1641:"20b900e0adda4c80db1d",1651:"c86d270cf7725cab1d79",1956:"74c8ff5a5ca0f4903469",2034:"10aef63b282d61d6c639",2035:"e1aebed4bfd6bd09ee7e",2353:"44bbdb8df13e8a622208",2372:"a22ed3ddae437e986477",2724:"0bf0368274ee9e0747d2",2832:"eb28f9840b1271c7d62a",2936:"62bb94fb29069bd56587",2966:"2c1ff93e3007f7225cb8",2979:"d966b75bfce67342eeac",3107:"4ae39080543abe3da100",3138:"75edb076a18972355143",3195:"8dc5dbdee19baf1191a1",3292:"4204bb21e63dbda3313b",3493:"b843364884901abc3eb0",3559:"0407e4aa7480eddd0ef1",3581:"e65b43625d381405a12c",3716:"d6ab7b12b699eee673e0",3862:"4213b001dbf03cea161e",3963:"49b1c889b28a0c5714d1",4123:"874e7dece76e9760a495",4152:"70172b2b6a2202bc19e4",4254:"05f327b93d437c2f3601",4299:"37495161e93e1b14a62a",4325:"88bc29304269c158b066",4407:"767000e4cd0f3e15307e",4512:"f82c4b423f5c0dbd30dd",4531:"7457626c1fb01d704537",4644:"2721494c4c12cc6d3bc2",4785:"a097bbcd58df09778180",4840:"1b05bd12ede150f03e77",4947:"676f3abafc2b02c5fa31",5015:"211414a16467b37cae34",5058:"c0ca6a30fe8b53f6d2b2",5106:"908216bcff18d3fd7aad",5133:"74d1d5d467c9be5ef47a",5267:"e5a307f4cc5995492285",5274:"0be3aa33d3ffc719dcff",5505:"313286a530596f7a6b25",5662:"9b43b1237225d7ff7542",5667:"851d77804ca881f31ac9",5797:"861f7e8a005e9a4063c6",5865:"f1a798618f3b6f9903b0",5977:"bf7db06c1133a66449f3",5987:"028c01be18ffb17f5482",6017:"f4e0251f6746e3f339f1",6322:"30a126263c6970e6793a",6363:"9d5f249f8ba4467549c4",6574:"6f9df14941f855202a9d",6903:"d6dfc26ae3076c85ed1f",7024:"f436d8b414f7a558c554",7084:"4cdc22dfd7d247240602",7090:"291628b7c2c07c2d6f94",7131:"c27aefd28ade057122d1",7204:"3e5234153f1f490db272",7262:"0380fb22702b7b1fbf61",7269:"a46d5b5fe65c5fd574e8",7329:"430ef38cd030411e470c",7335:"920664487a3d2ae93e13",7345:"66b366ea63a5ec112a1d",7357:"557d366dc6db747c3062",7363:"f3c9aaf269ff7f29b793",7369:"38be51a057fc00f0f7ef",7539:"45b957bf1324ccf78ffe",7697:"35e517bb715e4b5c7b10",7794:"4e5dcc0a46043951fd82",8010:"1d4a0c12caaaca4542da",8113:"1a49932d3f9f58a0e19b",8151:"286ead9d06e13c599aa4",8211:"983a3e4ce7f9d841c8fb",8224:"972a60c780f0448a5f47",8236:"2aead7cb9f823d2b0bd9",8285:"01146be20c37f70177c6",8519:"69cf4d6707f67ab66004",8603:"5723927781ff4ed61db8",8661:"7093c6c8677b30f38493",8852:"d237c16bb6b8e4258674",9019:"633dbe3b28ca96a0abf5",9049:"d9917b1342dda4789bae",9198:"097d936d40dd0f3aa9da",9229:"5d03eb6d1503a7e3708e",9411:"fa23eea5dd4e55cc2da6",9416:"6ee4ffb0e861caab07f2",9529:"f93f4d7733e910b1cad8",9612:"48e1d8ac85448df568dc",9767:"51e75328b2c6a3d3fe16"}[e]+".bundle.js",__webpack_require__.miniCssF=e=>4826===e?"css/index.css":"css/"+e+".css",__webpack_require__.g=function(){if("object"==typeof globalThis)return globalThis;try{return this||new Function("return this")()}catch(e){if("object"==typeof window)return window}}(),__webpack_require__.o=(e,a)=>Object.prototype.hasOwnProperty.call(e,a),e={},a="@universalis/web_fr:",__webpack_require__.l=(r,_,d,c)=>{if(e[r])e[r].push(_);else{var b,f;if(void 0!==d)for(var t=document.getElementsByTagName("script"),i=0;i<t.length;i++){var n=t[i];if(n.getAttribute("src")==r||n.getAttribute("data-webpack")==a+d){b=n;break}}b||(f=!0,(b=document.createElement("script")).charset="utf-8",b.timeout=120,__webpack_require__.nc&&b.setAttribute("nonce",__webpack_require__.nc),b.setAttribute("data-webpack",a+d),b.src=r),e[r]=[_];var onScriptComplete=(a,_)=>{b.onerror=b.onload=null,clearTimeout(u);var d=e[r];if(delete e[r],b.parentNode&&b.parentNode.removeChild(b),d&&d.forEach((e=>e(_))),a)return a(_)},u=setTimeout(onScriptComplete.bind(null,void 0,{type:"timeout",target:b}),12e4);b.onerror=onScriptComplete.bind(null,b.onerror),b.onload=onScriptComplete.bind(null,b.onload),f&&document.head.appendChild(b)}},__webpack_require__.r=e=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},__webpack_require__.nmd=e=>(e.paths=[],e.children||(e.children=[]),e),__webpack_require__.p="/_web/assets/",r=(e,a,r)=>{var _=document.createElement("link");return _.rel="stylesheet",_.type="text/css",_.onload=a,_.onerror=function(a){var d=a&&a.target&&a.target.src||e,c=new Error("Loading CSS chunk "+chunkId+" failed.\n("+d+")");c.code="CSS_CHUNK_LOAD_FAILED",c.request=d,_.parentNode.removeChild(_),r(c)},_.href=e,document.getElementsByTagName("head")[0].appendChild(_),_},_=e=>new Promise(((a,_)=>{var d=__webpack_require__.miniCssF(e),c=__webpack_require__.p+d;if(((e,a)=>{for(var r=document.getElementsByTagName("link"),_=0;_<r.length;_++){var d=(b=r[_]).getAttribute("data-href")||b.getAttribute("href");if("stylesheet"===b.rel&&(d===e||d===a))return b}var c=document.getElementsByTagName("style");for(_=0;_<c.length;_++){var b;if((d=(b=c[_]).getAttribute("data-href"))===e||d===a)return b}})(d,c))return a();r(c,a,_)})),d={4826:0},__webpack_require__.f.miniCss=(e,a)=>{d[e]?a.push(d[e]):0!==d[e]&&{1203:1,2724:1,2979:1,4644:1,5667:1,6363:1}[e]&&a.push(d[e]=_(e).then((()=>{d[e]=0}),(a=>{throw delete d[e],a})))},(()=>{var e={4826:0};__webpack_require__.f.j=(a,r)=>{var _=__webpack_require__.o(e,a)?e[a]:void 0;if(0!==_)if(_)r.push(_[2]);else{var d=new Promise(((r,d)=>_=e[a]=[r,d]));r.push(_[2]=d);var c=__webpack_require__.p+__webpack_require__.u(a),b=new Error;__webpack_require__.l(c,(r=>{if(__webpack_require__.o(e,a)&&(0!==(_=e[a])&&(e[a]=void 0),_)){var d=r&&("load"===r.type?"missing":r.type),c=r&&r.target&&r.target.src;b.message="Loading chunk "+a+" failed.\n("+d+": "+c+")",b.name="ChunkLoadError",b.type=d,b.request=c,_[1](b)}}),"chunk-"+a,a)}};var webpackJsonpCallback=(a,r)=>{var _,d,[c,b,f]=r,t=0;if(c.some((a=>0!==e[a]))){for(_ in b)__webpack_require__.o(b,_)&&(__webpack_require__.m[_]=b[_]);if(f)f(__webpack_require__)}for(a&&a(r);t<c.length;t++)d=c[t],__webpack_require__.o(e,d)&&e[d]&&e[d][0](),e[d]=0},a=self.webpackChunk_universalis_web_fr=self.webpackChunk_universalis_web_fr||[];a.forEach(webpackJsonpCallback.bind(null,0)),a.push=webpackJsonpCallback.bind(null,a.push.bind(a))})(),__webpack_require__.nc=void 0,document.addEventListener("DOMContentLoaded",(function(){__webpack_require__.e(3138).then(__webpack_require__.bind(__webpack_require__,73138)).then((function(){Promise.all([__webpack_require__.e(9529),__webpack_require__.e(2372)]).then(__webpack_require__.bind(__webpack_require__,82372)).then((function(e){e.default()}))}))}))})();</script> <script> let eu_article_ucode = "G920003"</script> </body> </html>