Models simulating nutrient transport at the catchment scale are frequently used for source apportionment and thereby for finding cost-efficient management strategies for water quality improvements. One typical modelling approach at the catchment scale is the use of leaching coefficients (mass per unit flow of water) to compute the nutrient input based on land-use information. In this study two different such model approaches, the lumped Fyrismodel and the distributed HBV-N-D model, were compared based on simulations for the River Fyris catchment in central Sweden. A major difference between the models were different assumptions of specific runoff variations between different land-use classes. These differences had a considerable effect on the computed source apportionment. The higher specific runoff from agricultural areas in the HBV-N-D model compared to the Fyrismodel resulted in a larger contribution of agricultural areas to the total nitrogen export. These results demonstrate the importance of the assumptions of the spatial variation of specific runoff on source apportionment HBV-N-D model estimations.
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Research Article|
August 01 2007
Nitrogen source apportionment modeling and the effect of land-use class related runoff contributions
G.A. Lindgren;
G.A. Lindgren
1Department of Environmental Assessment, Swedish University of Agricultural Sciences, 750 07, Uppsala, Sweden
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S. Wrede;
S. Wrede
2Department of Physical Geography and Quaternary Geology, Stockholm University, SE 10691, Stockholm, Sweden
3Water Resources Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2600 GA Delft, The Netherlands
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J. Seibert;
J. Seibert
*
2Department of Physical Geography and Quaternary Geology, Stockholm University, SE 10691, Stockholm, Sweden
*Corresponding author. E-mail: [email protected]
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M. Wallin
M. Wallin
1Department of Environmental Assessment, Swedish University of Agricultural Sciences, 750 07, Uppsala, Sweden
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Hydrology Research (2007) 38 (4-5): 317–331.
Article history
Received:
December 21 2006
Accepted:
August 22 2007
Citation
G.A. Lindgren, S. Wrede, J. Seibert, M. Wallin; Nitrogen source apportionment modeling and the effect of land-use class related runoff contributions. Hydrology Research 1 August 2007; 38 (4-5): 317–331. doi: https://doi.org/10.2166/nh.2007.015
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