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OLW_Estuaries_final.pdf (7.7 MB)

From mountains to the sea: values and science for an informed kaitiaki/guardian - land

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posted on 2024-06-21, 03:59 authored by Alexander Herzig, Andrew Neverman, Robbie Price, Michelle Barnes
This project aimed to assess the impacts and implications of meeting contaminant reduction targets for estuaries on catchment land-use and management. The objectives were to:
  • Estimate the time distribution of contaminant loads at sub-annual scales.
  • Estimate catchment contaminant loads to all case-study estuaries, i.e. Kaipara Harbour, New River, and Waihi, and to all New Zealand estuaries under changed climate and mitigations.
  • Identify catchment land-use scenarios for a range of contaminant reduction targets for estuaries.
The project found the adoption of feasible mitigation options in combination with targeted moderate land-use change will be able to sustain a significantly improved ecological health of New Zealand estuaries and rivers. Increased effort implementing sediment mitigation measures is required to keep up with climate-driven exacerbation of sediment generation, especially in soft-rock hill country. For estuaries susceptible to eutrophication or whose catchments exceed NPS-FM bottom lines for one or more contaminants, implementing P and sediment mitigation measures alongside N mitigation measures targeting a 60% N reduction could sustain a considerably improved ecological health of estuaries and rivers.

Funding

Funded by the New Zealand Ministry for Business, Innovation and Employment's Our Land and Water National Science Challenge (Toitū te Whenua, Toiora te Wai) as part of project Healthy Estuaries

History

Publication date

2021-09-07

Language

  • English

Does this contain Māori information or data?

  • No

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