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Related Experiment Videos

Modelling diffuse nutrient flow in eutrophication control scenarios.

B Arheimer1, L Andersson, M Larsson

  • 1Swedish Meteorological and Hydrological Institute, SE-601 76 Norrköping, Sweden.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|April 1, 2004
PubMed
Summary
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Changed agricultural practices offer the most cost-effective method for reducing nitrogen pollution. Constructed wetlands show limited impact, while fish removal can decrease lake algae without increasing downstream nutrient loads.

Area of Science:

  • Environmental Science
  • Water Resource Management
  • Eutrophication Control

Background:

  • The Swedish Water Management Research Programme (VASTRA) aims to develop tools for efficient eutrophication control under the EU Water Framework Directive.
  • Current research focuses on modeling nutrient flows, with nitrogen models developed and phosphorus models under construction (e.g., HBV-P).

Purpose of the Study:

  • To assess the effectiveness of various strategies for reducing nutrient transport and eutrophication in Swedish water bodies.
  • To provide scientifically-backed scenarios for implementing the EU Water Framework Directive in Sweden.

Main Methods:

  • Interdisciplinary collaboration involving actor-games and focus group evaluations.
  • Scenario analysis using developed nitrogen and phosphorus flow models.

Related Experiment Videos

  • Modeling different measure strategies in a pilot catchment (Rönne å) for VASTRA phase II.

    • Main Results:

    • Changed agricultural practices are identified as the most effective and economical method for reducing nitrogen transport to the sea.
    • Constructed agricultural wetlands demonstrate a limited impact on riverine nitrogen transport due to natural hydrometeorological factors.
    • Removing planktivorous fish effectively reduces lake algal concentrations without increasing downstream nutrient loads.

    Conclusions:

    • Agricultural practice modification is a key strategy for cost-effective nitrogen reduction.
    • The effectiveness of constructed wetlands is region-specific and influenced by hydrological dynamics.
    • Ecological engineering approaches, like fish removal, offer targeted eutrophication management in lakes.