Hauraki Integrated Land-Water Modelling

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Our science prevents property damage and saves lives.</div> </div> </div> <div> <div class="field field--name-link field--type-link field--label-hidden field__item menu-link-content__section-link"> <a href="/hazards"> Explore all </a> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-topics view-id-menu_item_topics view-display-id-entity_view_1 js-view-dom-id-1c16b652da77f9585128a9b02cbf973ba6e713d6493255e7d79b8b299a11fec7"> <div class="view view-eva view-menu-item-topics view-id-menu_item_topics view-display-id-entity_view_2 js-view-dom-id-6b0c82ed502aae0ad990030499dd5aa117fee71607507b6d27b369394472050f"> <div class="views-row"><div class="taxonomy-term taxonomy-term--type-topic taxonomy-term--view-mode-topic-children-tags ds-1col clearfix"> <div class="views-element-container"><div class="view view-eva view-topic-children view-id-topic_children view-display-id-entity_view_1 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href="/hazards/geological-hazards" hreflang="en">Geological hazards</a></div> </div> </div> </div> </div> </div> </div> <div> <div class="field field--name-field-grouped-links field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/hazards?pt=10">Research</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/hazards/future-coasts-aotearoa">Future Coasts Aotearoa</a></div> <div class="field__item"><a href="/hazards/identifying-rip-currents-using-artificial-intelligence">Identifying rip currents using AI</a></div> <div class="field__item"><a href="/hazards/riskscape-software">Riskscape software</a></div> <div class="field__item"><a href="/hazards/ma-te-haumaru-o-nga-puna-wai-o-rakaihautu-ka-ora-mo-ake-tonu">Mā te haumaru ō te wai: Aotearoa flood resilience</a></div> <div class="field__item"><a href="/hazards/research-projects/responding-to-and-preparing-for-extreme-weather-events">Responding to and preparing for extreme weather events</a></div> <div class="field__item"><a href="/climate-and-weather/forecasting-weather-systems">Forecasting weather systems</a></div> <div class="field__item"><a href="/hazards/tsunami-generated-underwater-volcanoes">Tsunami generated by underwater volcanoes</a></div> <div class="field__item"><a href="/hazards/weather-hazards/river-flow-forecasting">River flow forecasting</a></div> </div> </div> </div> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/our-services?subtree%5Btopic%5D=198">Tools & services</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/hazards/coastal-hazards/extreme-coastal-flood-maps-aotearoa-new-zealand">Extreme coastal flood maps for Aotearoa New Zealand</a></div> <div class="field__item"><a href="/coasts/physical-hazards-affecting-coastal-margins-and-continental-shelf/storm-tide-red-alert-days-2024">Storm-tide red-alert days 2024</a></div> <div class="field__item"><a href="/coasts/tide-forecaster">Tide forecaster</a></div> <div class="field__item"><a href="/hazards/sea-level-rise">Sea-level rise</a></div> <div class="field__item"><a href="https://shiny.niwa.co.nz/drought-forecast/">Drought dashboard</a></div> <div class="field__item"><a href="/climate-and-weather/serious-games-tool-engage-people">Serious games as a tool to engage people</a></div> </div> </div> </div> </div> </div> </div> <div class="layout__region layout__region--second"> <div> <div class="field field--name-field-promoted-page field--type-entity-reference field--label-hidden field__item"> <div class="card card--mega-menu"> <div class="field field--name-dynamic-token-fieldnode-link-to-source field--type-ds field--label-hidden field__item"><p class="card__link-to-source"><a class="card__link" href="/news/tonga-eruption-confirmed-largest-ever-recorded">Link to source page</a></p> </div> <div class="field field--name-field-promotion-image field--type-entity-reference field--label-hidden field__item"> <img loading="lazy" src="/sites/default/files/styles/card_mega_menu/public/2022_10_3D_MODEL_HTHH_parsonskingDSC00900-web.jpg?h=f3f0a9e5&itok=gsi2rTI3" width="614" height="409" /> </div> <div class="field field--name-node-title field--type-ds field--label-hidden field__item"><h2> Tonga eruption confirmed as largest ever recorded </h2> </div> <div class="field field--name-field-page-type field--type-entity-reference field--label-hidden field__item">Media release</div> <div class="field field--name-node-post-date field--type-ds field--label-hidden field__item">21 November 2022</div> <div class="field field--name-field-description field--type-string-long field--label-hidden field__item">A New Zealand-led team has completed the fullest investigation to date into January’s eruption of the underwater Tongan volcano.</div> </div> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_1 js-view-dom-id-6015c1432b95dd4e528115752940cfe79e341c6d7ffcb60940b083497c0e8781"> <div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_2 js-view-dom-id-ca9249874dd4e3dc8e32558169f043cc695ef2b1bf9f599a4f6a10e77d809286"> </div> </div> </div> </div> </div> </div> </div> </li> <li class="site__header__menu__item--primary"> <a href="/coasts-and-oceans" title="NIWA aims to provide the knowledge needed for the sound environmental management of our marine resources." class="site__header__menu__link--primary">Coasts & Oceans</a> <div class="menu_link_content menu-link-contentmain view-mode-default menu-dropdown menu-dropdown-0 menu-type-default"> <div class="layout layout--twocol-section layout--twocol-section--75-25"> <div class="layout__region layout__region--first"> <div> <div class="field field--name-title field--type-string field--label-hidden field__item"><h1 class="menu-link-content__heading">Coasts & Oceans</h1> </div> </div> <div> <div class="field field--name-description field--type-string field--label-hidden field__item"><div class="menu-link-content__description">NIWA aims to provide the knowledge needed for the sound environmental management of our marine resources.</div> </div> </div> <div> <div class="field field--name-link field--type-link field--label-hidden field__item menu-link-content__section-link"> <a href="/coasts-and-oceans"> Explore all </a> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-topics view-id-menu_item_topics view-display-id-entity_view_1 js-view-dom-id-df2e6e0885362ed91f6aa26c83c5d9fdda5f4feecf6457d13dc00897fcb8185f"> <div class="view view-eva view-menu-item-topics view-id-menu_item_topics view-display-id-entity_view_2 js-view-dom-id-1f6a0d1814042eb59d2e7f5c294fc2b25fd4fe2b10f093377b72347c3da583ab"> <div class="views-row"><div class="taxonomy-term taxonomy-term--type-topic taxonomy-term--view-mode-topic-children-tags ds-1col clearfix"> <div class="views-element-container"><div class="view view-eva view-topic-children view-id-topic_children view-display-id-entity_view_1 js-view-dom-id-51f672e0214b6fa8f4240883d96af509fd5188d13401eb7f4d612e456d5e0201"> </div> </div> </div> </div> </div> </div> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-related-topics view-id-menu_item_related_topics view-display-id-entity_view_1 js-view-dom-id-f64d9a407120e4ff48dbcefdd7076d72fa85e9ff2eb787e7bd86af3639701639"> <div class="view view-eva view-menu-item-related-topics view-id-menu_item_related_topics view-display-id-entity_view_2 js-view-dom-id-32bc629e948a8d90dbd2a7f8c6622ce43ce99d7da266ee023293d5189de17484"> <div class="views-row"><div class="taxonomy-term taxonomy-term--type-topic taxonomy-term--view-mode-topic-related-tags ds-1col clearfix"> <div class="topic-tag topic-tag--related"><a href="/fisheries" hreflang="en">Fisheries</a></div> <div class="topic-tag topic-tag--related"><a href="/aquaculture" hreflang="en">Aquaculture</a></div> <div class="topic-tag topic-tag--related"><a href="/oceans" hreflang="en">Oceans</a></div> <div class="topic-tag topic-tag--related"><a href="/coasts" hreflang="en">Coasts</a></div> <div class="topic-tag topic-tag--related"><a href="/coasts/estuaries" hreflang="en">Estuaries</a></div> <div class="topic-tag topic-tag--related"><a href="/antarctica" hreflang="en">Antarctica</a></div> </div> </div> </div> </div> </div> </div> <div> <div class="field field--name-field-grouped-links field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/research">Research</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/antarctica?pt=10#filters">Antarctica</a></div> <div class="field__item"><a href="/aquaculture?pt=10#filters">Aquaculture</a></div> <div class="field__item"><a href="/coasts?pt=10#filters">Coasts </a></div> <div class="field__item"><a href="/research?subtree%5Btopic%5D=6145&subtree%5Bsubtopic%5D=158&created=All">Estuaries</a></div> <div class="field__item"><a href="/fisheries?pt=10#filters">Fisheries </a></div> <div class="field__item"><a href="/oceans?pt=10#filters">Oceans</a></div> </div> </div> </div> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/our-services">Tools & Services</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/aquaculture?pt=13#filters">Aquaculture</a></div> <div class="field__item"><a href="/coasts?pt=13#filters">Coasts</a></div> <div class="field__item"><a href="/our-services?subtree%5Btopic%5D=6145&subtree%5Bsubtopic%5D=158">Estuaries</a></div> <div class="field__item"><a href="/fisheries?pt=13#filters">Fisheries</a></div> <div class="field__item"><a href="/oceans?pt=13#filters">Oceans</a></div> <div class="field__item"><a href="/vessels/niwa-vessels">NIWA Vessels</a></div> </div> </div> </div> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/coasts-and-oceans?pt=27">Frequently visited</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/aquaculture/yellowtail-kingfish">Kingfish aquaculture</a></div> <div class="field__item"><a href="/node/113711">Future Coasts Aotearoa</a></div> <div class="field__item"><a href="/coasts/marine-biosecurity">Marine biosecurity</a></div> <div class="field__item"><a href="/fisheries/ross-sea-toothfish-fishery">The Ross Sea toothfish fishery</a></div> <div class="field__item"><a href="/fisheries/recreational-fishing">Recreational Fishing</a></div> <div class="field__item"><a href="/coasts/marine-identification-guides-and-fact-sheets">Marine identification guides</a></div> <div class="field__item"><a href="/vessels/voyages">Voyages</a></div> <div class="field__item"><a href="/coasts/edna-research-and-services">eDNA research and services</a></div> </div> </div> </div> </div> </div> </div> <div class="layout__region layout__region--second"> <div> <div class="field field--name-field-promoted-page field--type-entity-reference field--label-hidden field__item"> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="card card--mega-menu"> <div class="field field--name-dynamic-token-fieldnode-link-to-source field--type-ds field--label-hidden field__item"><p class="card__link-to-source"><a class="card__link" href="/vessels/kaharoa-ii">Link to source page</a></p> </div> <div class="field field--name-field-promotion-image field--type-entity-reference field--label-hidden field__item"> <img loading="lazy" src="/sites/default/files/styles/card_mega_menu/public/2024-06/kaharoa_II_a25_2024-03-22%2017-50-53_JN_fx%20%28Custom%29.jpeg?h=cf677393&itok=3HCaj-r9" width="614" height="409" alt="Kaharoa II" /> </div> <div class="field field--name-node-title field--type-ds field--label-hidden field__item"><h2> Kaharoa II </h2> </div> <div class="field field--name-field-page-type field--type-entity-reference field--label-hidden field__item">Facility</div> <div class="field field--name-node-post-date field--type-ds field--label-hidden field__item">14 May 2024</div> <div class="field field--name-field-description field--type-string-long field--label-hidden field__item">Kaharoa II sets the standard of excellence for marine research vessels</div> </div> </div> </div> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_1 js-view-dom-id-3082ea09f7af6175fb21c90af2c66e7d9acf966f7931760c90b9d16d11cc3a77"> <div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_2 js-view-dom-id-6f20f28bfb8d20a0e0307b9c20a02880a930f4890906f28ca61e3c0b9c33c18e"> </div> </div> </div> </div> </div> </div> </div> </li> <li class="site__header__menu__item--primary"> <a href="/freshwater" title="We provide public information on river, lake, and groundwater conditions across New Zealand including water quantity and quality." class="site__header__menu__link--primary" data-drupal-link-system-path="node/114353">Freshwater</a> <div class="menu_link_content menu-link-contentmain view-mode-default menu-dropdown menu-dropdown-0 menu-type-default"> <div class="layout layout--twocol-section layout--twocol-section--75-25"> <div class="layout__region layout__region--first"> <div> <div class="field field--name-title field--type-string field--label-hidden field__item"><h1 class="menu-link-content__heading">Freshwater</h1> </div> </div> <div> <div class="field field--name-description field--type-string field--label-hidden field__item"><div class="menu-link-content__description">We provide public information on river, lake, and groundwater conditions across New Zealand including water quantity and quality.</div> </div> </div> <div> <div class="field field--name-link field--type-link field--label-hidden field__item menu-link-content__section-link"> <a href="/freshwater"> Explore all </a> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-topics view-id-menu_item_topics view-display-id-entity_view_1 js-view-dom-id-ce233703a2e4d8b8f3beb657ccf1f549c69363dc11b32667805f3fd74077fc7b"> <div class="view view-eva view-menu-item-topics view-id-menu_item_topics view-display-id-entity_view_2 js-view-dom-id-70e777f855a99bc4d9b88b01d37bb2a008d9c62106b7ce611ecb8dcc7d782813"> <div class="views-row"><div class="taxonomy-term taxonomy-term--type-topic taxonomy-term--view-mode-topic-children-tags ds-1col clearfix"> <div class="views-element-container"><div class="view view-eva view-topic-children view-id-topic_children view-display-id-entity_view_1 js-view-dom-id-103555cf1466d8c47a9f53d24850c3f5a09fd8725e8c24fc5623881e65d6197b"> </div> </div> </div> </div> </div> </div> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-related-topics view-id-menu_item_related_topics view-display-id-entity_view_1 js-view-dom-id-0cff24d43787b323ecc3b2a3feb76741c543bab6797700d33f3c74c414634acc"> <div class="view view-eva view-menu-item-related-topics view-id-menu_item_related_topics view-display-id-entity_view_2 js-view-dom-id-be4bb702a4d576df2c5171f80f040f524631edcf1684bf2b44a1f0fa6afc7626"> <div class="views-row"><div class="taxonomy-term taxonomy-term--type-topic taxonomy-term--view-mode-topic-related-tags ds-1col clearfix"> <div class="topic-tag topic-tag--related"><a href="/freshwater/ecological-monitoring" hreflang="en">Ecological monitoring</a></div> <div class="topic-tag topic-tag--related"><a href="/freshwater/ecotoxicology" hreflang="en">Ecotoxicology</a></div> <div class="topic-tag topic-tag--related"><a href="/freshwater/freshwater-fish" hreflang="en">Freshwater fish</a></div> <div class="topic-tag topic-tag--related"><a href="/freshwater/freshwater-invertebrates" hreflang="en">Freshwater invertebrates</a></div> <div class="topic-tag topic-tag--related"><a href="/freshwater/freshwater-quality" hreflang="en">Freshwater quality</a></div> <div class="topic-tag topic-tag--related"><a href="/freshwater/freshwater-restoration" hreflang="en">Freshwater restoration</a></div> </div> </div> </div> </div> </div> </div> <div> <div class="field field--name-field-grouped-links field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/freshwater?pt=10">Research</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/freshwater/research-projects/investigating-ecological-impacts-on-freshwater-insects-from-led-streetlight-conversions">Investigating ecological impacts on freshwater insects from LED streetlights</a></div> <div class="field__item"><a href="/freshwater/research-projects/effective-mitigation-systems-to-manage-contaminant-losses">Effective mitigation systems to manage contaminant losses</a></div> <div class="field__item"><a href="/te-kuwaha/research-projects/cultural-keystone-species-co-management-and-restoration-of-our-freshwater-taonga-species">Cultural Keystone Species</a></div> <div class="field__item"><a href="/freshwater/research-projects/freshwater-bioremediation-using-native-mussels-focussed-on-shallow-eutrophic-lakes">Freshwater bioremediation using native mussels</a></div> <div class="field__item"><a href="/freshwater/research-projects/hauraki-integrated-land-water-modelling">Hauraki Integrated Land-Water Modelling</a></div> <div class="field__item"><a href="/freshwater/research-projects/snow-and-ice-network">Snow and Ice Network</a></div> </div> </div> </div> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/freshwater?pt=13">Services</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/freshwater/our-services/climate-change-freshwater-impacts-assessments">Climate change freshwater impacts assessments</a></div> <div class="field__item"><a href="/our-science/freshwater/our-services/specialist-analytical-services">Specialist analytical services</a></div> <div class="field__item"><a href="/freshwater/our-services/flow-assessment-and-management">Flow assessment and management</a></div> <div class="field__item"><a href="/freshwater/our-services/freshwater-data-online">Freshwater databases online</a></div> <div class="field__item"><a href="/freshwater/our-services/freshwater-species-and-habitat-management">Freshwater species and habitat management</a></div> <div class="field__item"><a href="/freshwater/our-services/stormwater-management">Stormwater management</a></div> <div class="field__item"><a href="/freshwater/our-services/catchment-modelling">Catchment modelling</a></div> <div class="field__item"><a href="/freshwater/our-services/water-quality-monitoring-and-advice">Water quality monitoring and advice</a></div> </div> </div> </div> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/freshwater?pt=13">Tools & Resources</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/freshwater/management-tools/riparian-buffer-design-guide">Riparian Buffer Design Guide</a></div> <div class="field__item"><a href="/freshwater/management-tools/restoration-tools/constructed-wetland-guidelines">Constructed wetland guidelines</a></div> <div class="field__item"><a href="/freshwater/freshwater-update/freshwater-update-80-march-2019/the-new-zealand-water-model-nzwam-%E2%80%93-a-new-water-modelling-approach">The New Zealand Water Model (NZWaM) </a></div> <div class="field__item"><a href="/freshwater/tools/biosecurity">Biosecurity tools</a></div> <div class="field__item"><a href="/freshwater/management-tools/environmental-flow-tools">Environmental flow tools</a></div> <div class="field__item"><a href="/freshwater/management-tools/fish-passage-assessment-tool">Fish Passage Assessment Tool</a></div> <div class="field__item"><a href="/freshwater/management-tools/environmental-flow-tools/new-zealand-streamflow-depletion-model">New Zealand streamflow depletion model</a></div> <div class="field__item"><a href="/freshwater/our-services/catchment-modelling/clues-catchment-land-use-for-environmental-sustainability-model">CLUES – Catchment Land Use for Environmental Sustainability model</a></div> </div> </div> </div> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a href="https://niwa.co.nz/freshwater/freshwater-programme-overview">Programmes</a></h2> <div class="field field--name-field-links field--type-link field--label-hidden field__items"> <div class="field__item"><a href="/freshwater/programme-overview/freshwater-species-ecology-and-management">Freshwater species ecology and management</a></div> <div class="field__item"><a href="/freshwater/programme-overview/Hydrological-observations-and-predictions">Hydrological observations and predictions</a></div> <div class="field__item"><a href="/freshwater/programme-overview/environmental-flows">Environmental flows</a></div> <div class="field__item"><a href="/freshwater/programme-overview/causes-and-effects-of-water-quality-degradation">Causes and effects of water quality degradation</a></div> <div class="field__item"><a href="/freshwater-biosecurity">Freshwater biosecurity</a></div> <div class="field__item"><a href="/freshwater/programme-overview/mitigation-systems">Mitigation systems</a></div> </div> </div> </div> </div> </div> </div> <div class="layout__region layout__region--second"> <div> <div class="field field--name-field-promoted-page field--type-entity-reference field--label-hidden field__item"> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="card card--mega-menu"> <div class="field field--name-dynamic-token-fieldnode-link-to-source field--type-ds field--label-hidden field__item"><p class="card__link-to-source"><a class="card__link" href="/freshwater/freshwater-invertebrate-identification-and-e-guides">Link to source page</a></p> </div> <div class="field field--name-field-promotion-image field--type-entity-reference field--label-hidden field__item"> <img loading="lazy" src="/sites/default/files/styles/card_mega_menu/public/2023-02/Mayfly-image-NIWA.jpg?h=999433cf&itok=sCEv1D1n" width="614" height="409" alt="Image of mayflies [from NIWA Benthic Macroinvertebrates Field Identification Guide]" /> </div> <div class="field field--name-node-title field--type-ds field--label-hidden field__item"><h2> Freshwater invertebrate identification and e-guides </h2> </div> <div class="field field--name-field-page-type field--type-entity-reference field--label-hidden field__item">Education Resource</div> <div class="field field--name-node-post-date field--type-ds field--label-hidden field__item">06 February 2023</div> <div class="field field--name-field-description field--type-string-long field--label-hidden field__item">Downloadable and printable guides on identification of common freshwater invertebrates found in New Zealand waterways and lakes.</div> </div> </div> </div> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_1 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class="menu-link-content__heading">Te Kūwaha</h1> </div> </div> <div> <div class="field field--name-description field--type-string field--label-hidden field__item"><div class="menu-link-content__description">Working together with hapū, iwi, Māori communities and Māori business to deliver tailored science.</div> </div> </div> <div> <div class="field field--name-link field--type-link field--label-hidden field__item menu-link-content__section-link"> <a href="/te-kuwaha-and-maori"> Explore all </a> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-topics view-id-menu_item_topics view-display-id-entity_view_1 js-view-dom-id-9e953d85e5b92a6f47a98cb19ae636b3738a0567b1587264ce956573c6c1733a"> <div class="views-row"><div class="taxonomy-term taxonomy-term--type-topic taxonomy-term--view-mode-topic-children-tags ds-1col clearfix"> <div class="views-element-container"><div class="view view-eva view-topic-children view-id-topic_children 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field--type-ds field--label-hidden field__item">19 January 2023</div> <div class="field field--name-field-description field--type-string-long field--label-hidden field__item">NIWA’s Te Kūwaha Graduate Internship programme has been established to help support and create tangible pathways for the next generation of Māori researchers. </div> </div> </div> </div> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_1 js-view-dom-id-ee032b1cae969e147572e4ef28a95f2ce8a35b8414d085550eb71f9d0d63f233"> <div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_2 js-view-dom-id-4b139599e0d381cd4866a896521875249f512d91d34d8a278227384e63264bde"> </div> </div> </div> </div> </div> </div> </div> </li> <li class="site__header__menu__item--primary"> <a href="/pacific" title="We provide applied science and environmental 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class="view view-eva view-menu-item-related-topics view-id-menu_item_related_topics view-display-id-entity_view_1 js-view-dom-id-ca896907ad1e4442dce6b9759fe3b77c221c3b0c0bcee1515ea66aab2f0fbbed"> <div class="view view-eva view-menu-item-related-topics view-id-menu_item_related_topics view-display-id-entity_view_2 js-view-dom-id-777932b944a6ec699ba40df72a29747d7fac66c163f03e6ecccc8e2444aca58c"> <div class="views-row"><div class="taxonomy-term taxonomy-term--type-topic taxonomy-term--view-mode-topic-related-tags ds-1col clearfix"> <div class="topic-tag topic-tag--related"><a href="/pacific/pacific-rim-partnerships" hreflang="en">Pacific Rim partnerships</a></div> </div> </div> </div> </div> </div> </div> <div> <div class="field field--name-field-grouped-links field--type-entity-reference-revisions field--label-hidden field__items"> <div class="field__item"><div class="paragraph paragraph--type-grouped-links paragraph--view-mode-default ds-1col clearfix"> <h2><a 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field--name-node-post-date field--type-ds field--label-hidden field__item">30 January 2023</div> <div class="field field--name-field-description field--type-string-long field--label-hidden field__item">NIWA will be determining the impact of fisheries on the aquatic environment. This will inform an ecosystem-based approach to fisheries management and the development methods to mitigate this impact.</div> </div> </div> </div> </div> </div> <div> <div class="views-element-container"><div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_1 js-view-dom-id-b9c8f531382ec592b7ec2d46830bdde8f3e40949499bd555e56ee8d5a86aae6b"> <div class="view view-eva view-menu-item-related-content view-id-menu_item_related_content view-display-id-entity_view_2 js-view-dom-id-5bbf3ba29ce5ad443060d5b6dc9cdd40077d4f213dd5d35a6217f79f2ba3d675"> </div> </div> </div> </div> </div> </div> </div> </li> </ul> </nav> <nav role="navigation" aria-labelledby="block-niwa-secondarymenublock-menu" id="block-niwa-secondarymenublock"> <h2 class="visually-hidden" id="block-niwa-secondarymenublock-menu">Secondary menu</h2> <ul class="site__header__menu__list--secondary"> <li data-disable-flyout="0" class="site__header__menu__item--secondary"> <a href="/about-niwa" title="Decision makers at all levels are seeking evidence-based analysis and advice from environmental experts. 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132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"></path> </svg> </div> </div> </div> </a> </li> </ul> </div> </nav> </div> </div> </header> <main class="site__main"> <a id="main-content" tabindex="-1"></a> <div class="site__main__content"> <div> <div data-drupal-messages-fallback class="hidden"></div> <div id="block-niwa-content"> <header class="page__title-banner--with-out"> <div class="page__title-banner__promotion-image"> <div class='page__title-banner__promotion-image' style='background-image: url(https://niwa.co.nz/sites/default/files/styles/banner/public/Hauraki%20Gulf.jpg?h=1eb1bf41&itok=43V773HO)'></div> </div> <div class="page__title-banner-wrapper"> <div class="page__title-banner__text-box"> <div class="page__title"> <h1 class="page__title__text"> Hauraki Integrated Land-Water Modelling </h1> </div> <div class="page__summary"> <p class="page__summary__text">The Inner Hauraki Gulf/Tīkapa Moana ecosystem is facing proliferations of algae, de-oxygenation, reduced pH (acidification), reduced water clarity, and muddier sediments arising from historical and future land-derived contaminant inputs.</p> </div> <nav class="page__title-banner__icon-menu"> <a href="/oceans" class="field-group-link icon-menu__button" title="Oceans" hreflang="en"> <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0px" y="0px" viewBox="0 0 509.3 520.2" style="enable-background:new 0 0 509.3 520.2;" xml:space="preserve"> <style type="text/css"> .st0{display:none;} .st1{display:inline;} </style> <g id="Layer_1" class="st0"> <g id="Layer_5"> <path class="st1" d="M186.3,74.1c7.8-3.6,12.2-12.2,10.5-20.7L191.1,25L236.5,59c2.9,2.2,6.3,3.4,9.9,3.7 c27.6,2,51.5,13.5,70.4,27.7c20.8,15.6,35.6,34.3,42.8,46.8c-7.2,12.4-22,31.2-42.8,46.8c-18.9,14.1-42.8,25.8-70.4,27.7 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field--label-hidden field__item"><div class="wp-block-drupalmedia-drupal-media-entity"></div> <h2>The Issue</h2> <p>The Inner Hauraki Gulf/Tīkapa Moana ecosystem is facing proliferations of algae, de-oxygenation, reduced pH (acidification), reduced water clarity, and muddier sediments arising from historical and future land-derived contaminant inputs. These effects are likely to be exacerbated by continued inputs and climate change. Freshwater systems feeding the Gulf, such as those in the Hauraki Plains, also face stressors such as deoxygenation and excessive macrophyte growth. Regional planning initiatives have called for predictive integrative models to help identify contaminant load limits for the Hauraki Gulf land-freshwater-marine system. These models need to incorporate the effects of climate change and mitigation systems used to reduce contaminant loads.</p> <h2>Objectives</h2> <p>To address these management needs, NIWA is trialling the use of coupled land, river and marine models to predict contaminant loads and mixing, and impacts on aquatic ecosystems, and to address management questions, as depicted in the diagram below.</p> <div class="wp-block-drupalmedia-drupal-media-entity"><div class="media media--type-image media--view-mode-default ds-1col clearfix"> <div class="field--image"> <a href="/sites/default/files/G1.png"><img src="/sites/default/files/styles/portrait/public/G1.png?itok=Tivv85ki" width="600" height="294" loading="lazy" /> </a> </div> </div> </div> <p> </p> <h2>The approach</h2> <p>The modelling approach extends and couples models for land generation of contaminants, river transport and effects, and marine transport and eutrophication to address management needs. The models will use existing and new environmental datasets to test and parameterise the models. Model development and application is planned for a four-year period to 2024, although future extensions are also envisaged.</p> <p>In the first year of the project, existing models were coupled and applied to scenarios of source load reduction and climate change. The models were:</p> <p>WRTDS - A statistical method to calculate daily time-series of river loading from historical monthly measurements</p> <p>CLUES – A catchment model of annual average nutrient generation and transport</p> <p>Rating curve disaggregation – A statistical method to derive daily catchment load estimates from mean annual loads and flows, which were predicted with the hydrological model TopNet.</p> <p>SWAT – A dynamic physics-based catchment model, was applied to predict changes in nutrient loading due to climate change scenario in a small dairy catchment (Toenepi)</p> <p>Delwaq – A river hydraulics and contaminant transport model was coupled with SWAT in a related project.</p> <p>ROMS – A sophisticated model for coastal hydrodynamics and eutrophication</p> <p>A strategic plan for further modelling and associated data collection was developed in the first year of the programme, based on input from a workshop with Waikato Regional Council and Auckland Council.</p> <h2>Results</h2> <p>The results of the first year of the programme have been documented in a<a href="/sites/default/files/Hauraki%20land-water%20modelling%20report%2016%20FINAL.pdf"> project report</a>. </p> <p>The pilot modelling study demonstrated the feasibility of linking catchment and coastal models to predict coastal eutrophication responses over a decadal time-scale, and using these models to assess implications of nutrient source reduction and climate change.</p> <p>Some example preliminary findings are (see figure below):</p> <ul> <li>Nitrogen loading is dominated by the Waihou and Piako catchments (73% of catchment loading to the gulf), although loading per unit catchment area is more evenly spread across rivers.</li> <li>The climate change scenario indicated reductions in catchment nitrogen loading associated with runoff reductions. This is a preliminary result based on a single scenario. Since predicted river flows and loading decreased by the same magnitude, the concentrations will not change much overall.</li> <li>Catchment loading reductions required to meet river bottom-line nitrogen targets at monitoring sites were modest (16%), leading to only small reductions in algal concentrations in the Gulf. The catchment reductions are preliminary results based on simplified modelling, and depend on the selection and locations of target concentrations.</li> </ul> <div class="wp-block-drupalmedia-drupal-media-entity"><div class="media media--type-image media--view-mode-default ds-1col clearfix"> <div class="field--image"> <a href="/sites/default/files/G2.JPG"><img src="/sites/default/files/styles/portrait/public/G2.JPG?itok=lDFsVKdo" width="600" height="449" loading="lazy" /> </a> </div> </div> </div> <p>Examples of preliminary model results. a) Distribution of total nitrogen (TN) loading for each river input to the coast. b) Boxplot of the distribution of daily nitrogen loads for a dairy subcatchment for a baseline and climate change scenario. c) Spatial distribution of mean algal chlorophyll concentrations under a load reduction and a baseline scenario.</p> <p>Most of the required data collection is underway or anticipated to be undertaken by Regional Councils or NIWA. NIWA is planning a survey of benthic health to inform the development of a benthic health model. </p> <p>An ambitious programme for model development has been proposed to address high-priority needs (see figure below), including application in a conjunctive land-water limit-setting context.</p> <div class="wp-block-drupalmedia-drupal-media-entity"><div class="media media--type-image media--view-mode-default ds-1col clearfix"> <div class="field--image"> <a href="/sites/default/files/SS1.JPG"><img src="/sites/default/files/styles/portrait/public/SS1.JPG?itok=tKqFm8Xr" width="600" height="366" loading="lazy" /> </a> </div> </div> </div> <p> </p> <h2>Work plan for the 2021-24 period.</h2> <p>Several opportunities to expand the scope of work beyond the proposed programme have also been identified. Iwi liaison has been initiated at the ‘inform’ level, but it is anticipated that there will be deeper engagement in the future. Interactions with Regional Councils will continue, including investigation of co-funding opportunities to complete the work programme, and application of the integrated modelling approach to other catchment-estuary systems.</p> </div> </div> </div> <div class="field field--name-dynamic-block-fieldnode-book-pages field--type-ds field--label-hidden field__item"><div class="views-element-container"><div class="book-cards card-grid js-view-dom-id-64dedea7e6e23f022462c9604be682e1906037a6f10affee32b434db5db22d9f"> <header> <div class="js-view-dom-id-dee7769c354ce3330def932d225920fcf9719fd30831ebaff2c89f6168f2d3a2"> </div> </header> </div> </div> </div> <div class="contacts"> <h2 class="contacts__label">NIWA Contacts</h2> <div > <div class="views-element-container"><div class="contacts--items contacts__items js-view-dom-id-7415db3bff49eca7341319f4b0fda6b9ca19d9edd7b21a695e0831a40ae8c9c1"> <div> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div 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