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Sediment

Geoff Reid

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Sediment is a natural part of our rivers, but too much sediment disrupts ecosystems and harms plants and fish. These resources can help you identify sources of sediment, understand how sediment moves through the landscape, and prevent soil loss.

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Summary

Assessing the Effectiveness of On-Farm Mitigation Actions

This research summary describes how effective on-farm mitigations have been so far, by comparing losses of nitrogen (N), phosphorus (P) and sediment in 1995 and…
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Journal Article

Temperature and Nitrogen Effects on Phosphorus Uptake by Agricultural Stream-Bed Sediments

Climate change will likely increase the growing season, temperatures, and ratio of nitrogen (N) to phosphorus (P) loss from land to water. However, it is…
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Journal Article

Predicting improved optical water quality in rivers resulting from soil conservation actions on land

Soil conservation not only conserves soil but it improves the water clarity of water in rivers. This improvement may be estimated by the methods shown…
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Journal Article

Assessing the Yield and Load of Contaminants with Stream Order: Would Policy Requiring Livestock to Be Fenced Out of High-Order Streams Decrease Catchment Contaminant Loads?

This paper won the JEQ Best Paper Award 2019. Concentration and flow data for 1998 to 2009 were used to calculate catchment load and yields…
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Technical Report

Evaluation of geospatial datasets and recognition of landscape gradients specific to water quality

This study evaluates the landscape relationships and suitability of existing geospatial datasets for the purposes of mapping physiographic water quality units for the Northland region.…
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Technical Report

Evaluation of the physiographic method for the Tasman Region

The work undertaken in this project provides Tasman District Council with a foundation for which the physiographic approach can be applied within the region. The…
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Technical Report

Advice for application of the physiographic method to the West Coast Region

Land and Water Science Ltd. was contracted to provide services to West Coast Regional Council through an Envirolink Small Advice Grant. The aim of the…
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Technical Report

SedNetNZ, SLUI and contaminant generation. Part 1: Sediment and water clarity

Horizons Regional Council asked Manaaki Whenua – Landcare Research to document the use of SedNetNZ in the Horizons region; update the assessment of the impact…
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Guidance

Towards a Physiographic Map: Information for Regional Councils

Physiographic Environments of New Zealand research is developing a cost-effective technique to measure and map (as an integrated physiographic layer) how features of the natural…
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Technical Report

Application of Physiographic Science to the Northland Region: Preliminary Hydrological and Redox Process-Attribute Layers

Water quality outcomes can vary spatially across the landscape, even when there are similar land use pressures. These differences are often the result of natural…
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Method

Tool for relating land use/management to sediment rating curve for the Manawatu catchment

Visual clarity of water is the distance (in metres) through water that objects can be seen. It is variable over time because it depends on…
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Technical Report

SedNetNZ, SLUI and contaminant generation. Part 2: Nitrogen, phosphorus and E. coli

Horizons Regional Council (HRC) requested Manaaki Whenua – Landcare Research (MWLR) to update SedNetNZ for the HRC region and use the results to assess the…
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