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Related Concept Videos

Testing Water Quality01:14

Testing Water Quality

When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...

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Related Experiment Video

Updated: Jul 5, 2026

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
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Using the R Package, nsink, to assess landscape N removal in coastal catchments.

Dorothy Q Kellogg1, Jeffrey W Hollister2, Chester L Arnold3

  • 1Department of Natural Resources Science, University of Rhode Island, Kingston, Rhode Island, 02881, USA.

F1000Research
|November 25, 2024
PubMed
Summary

The N-Sink tool identifies natural landscape features that remove nitrogen from waterways, helping managers understand how land use impacts coastal water quality. This approach aids in evaluating land management decisions for better nitrogen mitigation strategies.

Keywords:
GISNitrogenRcatchmentlandscape N sinknsinkwater resourceswatershed

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Area of Science:

  • Environmental Science
  • Ecosystem Management
  • Water Quality Assessment

Background:

  • Excess nitrogen loading degrades coastal ecosystems and estuarine water quality.
  • Land management decisions in watersheds directly influence downstream nitrogen delivery.
  • Natural landscape features like wetlands and streams act as nitrogen sinks, removing it from aquatic systems.

Purpose of the Study:

  • To introduce the N-Sink approach and the associated R package for identifying and evaluating landscape nitrogen sinks.
  • To provide a tool for managers to understand the impact of land use on nitrogen delivery to coastal waters.
  • To facilitate better decision-making regarding land use and nitrogen mitigation.

Main Methods:

  • Utilizes widely available GIS data to identify landscape sinks within catchments (HUC-12 or larger).
  • Estimates the nitrogen removal potential of identified sinks.
  • Maps nitrogen removal efficiency, transport, and delivery using static maps and interactive flowpath analysis.

Main Results:

  • The R package 'nsink' facilitates data acquisition, processing, and visualization of nitrogen sinks.
  • Static maps illustrate nitrogen removal efficiency and delivery.
  • Interactive exploration of flowpaths with detailed nitrogen removal data is available.

Conclusions:

  • N-Sink is a decision support tool for local decision-makers and NGOs to understand land use impacts on nitrogen delivery.
  • It aids in evaluating proposed development, zoning, and land acquisition/restoration projects.
  • Facilitates investigation of trade-offs among different nitrogen reduction strategies.