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Establishing "good ecological status" by reducing the nitrogen load of Norsminde Fjord

Establishing "good ecological status" by reducing the nitrogen load of Norsminde Fjord Henrik Skovgaard Consultant to Environment Centre Aarhus Ministry of the Environment E-mail: hnsk@cowi.dk. Headlines. The EU Water Frame Directive and environmental objectives

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Establishing "good ecological status" by reducing the nitrogen load of Norsminde Fjord

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  1. Establishing "good ecological status" by reducing the nitrogen load of Norsminde Fjord Henrik Skovgaard Consultant to Environment Centre Aarhus Ministry of the Environment E-mail: hnsk@cowi.dk

  2. Headlines • The EU Water Frame Directive and environmental objectives • Study area, Norsminde Fjord • Data for a model set up • Agwaplan definition of good ecological status • Possible reduction targets for the nitrogen load

  3. Reference conditions and ecological status High status Good status Moderate status Poor status Bad Status Reference condition Undisturbed condition At least good status in surface water

  4. Environmental indicators in surface water (WFD) Biological and chemical indicators (obligatory) • Plankton algae • Rooted plants • Bottom fauna • Fish • Hazardous substances Supportive indicators • Nitrogen and phosphorus • Salinity • Oxygen • Visability

  5. Area: 1,90 km2 Catchment area: 101 km2 Land use: 80% agriculture Norsminde Fjord and catchment area

  6. Environmental problems in Norsminde Fjord Too many nutrients Macroalgae drive out the natural rooted vegetation Toxic plankton algae Sludge

  7. Annual nitrogen load of Norsminde Fjord

  8. Measured and modelled nitrogen concentration in Norsminde Fjord in 2005

  9. Reference condition, present status and two scenarios representing good ecological status in Norsminde Fjord.

  10. Action plan Environmental objective Measure n Measure 4 Distance from objective Measure 3 Measure 2 Measure 1 Baseline

  11. Present and scenario 2 load of nitrogen from the main inlet Rævs Å. Agwaplan target 129 tons/y 65 tons/y

  12. Hydrodynamic model Water balance Temperature Salinity Ecological model Oxygen Nitrogen and phosphorus Plankton algae (chlorophyll) Macroalgae Rooted vegetation (seagrass) Validation of the hydrodynamic and ecological model (MIKE 3)

  13. Scenario calculations in the water plan in order to obtain good ecological status (Mike 3 model) • 2005 situation with normalized water flow • Baseline 2015 with measures already implemented • Varying N and P loads (percentage reduction compared to 2005) • N30/P15 • N50/P25 • N60/P25 • N80/P40 Biological indicator. Depth distribution of eelgrass.

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