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Modelling instream nitrogen variability in the Dee catchment, NE Scotland
A J Wade1, C Soulsby, S J Langan
1Department of Geography, University of Reading, UK.
The Science of the Total Environment
|March 3, 2001
Summary
The Integrated Nitrogen in CAtchments (INCA) model simulated streamwater nitrate-nitrogen (NO3-N) in the River Dee. Reducing fertilizer application decreased NO3-N, while increased nitrogen deposition raised it, informing catchment management strategies.
Area of Science:
- Environmental science
- Hydrology
- Biogeochemistry
Background:
- Nitrogen (N) pollution impacts aquatic ecosystems.
- Catchment modeling is crucial for understanding nutrient dynamics.
Purpose of the Study:
- Apply the Integrated Nitrogen in CAtchments (INCA) model to the River Dee.
- Assess the impact of nitrogen deposition and land use on streamwater nitrate-nitrogen (NO3-N).
Main Methods:
- Utilized the INCA model for simulation.
- Analyzed annual mean streamwater NO3-N concentrations and loads.
- Explored scenarios of reduced fertilizer application and increased N deposition.
Main Results:
- The INCA model successfully simulated observed annual mean streamwater NO3-N concentrations.
- A 20% fertilizer reduction predicted a 5% decrease in NO3-N.
- A 50% increase in N deposition predicted a 15% increase in NO3-N.
Conclusions:
- INCA is a valuable tool for predicting nitrogen dynamics in catchments.
- Model results provide insights for land use and N deposition management.
- Identified limitations and areas for future model improvement.