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| Titel |
Nitrogen Risk Assessment Model for Scotland: I. Nitrogen leaching |
| VerfasserIn |
S. M. Dunn, A. J. A. Vinten, A. Lilly, J. DeGroote, M. A. Sutton, M. McGechan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 8, no. 2 ; Nr. 8, no. 2, S.191-204 |
| Datensatznummer |
250005496
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| Publikation (Nr.) |
 copernicus.org/hess-8-191-2004.pdf |
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| Zusammenfassung |
| The Nitrogen Risk Assessment Model for Scotland (NIRAMS) has been developed
for prediction of streamwater N concentrations draining from agricultural land in Scotland.
The objective of the model is to predict N concentrations for ungauged catchments, to fill
gaps in monitoring data and to provide guidance in relation to policy development. The model
uses nationally available data sets of land use, soils, topography and meteorology and has
been developed within a Geographic Information System (GIS). The model includes modules to
calculate N inputs to the land, residual N remaining at the end of the growing season, weekly
time-series of leached N and transport of N at the catchment scale. This paper presents the
methodology for calculating N balances for different land uses and for predicting the time
sequence of N leaching after the end of the growing season. Maps are presented of calculated
residual N and N leaching for the whole of Scotland and the spatial variability in N leaching
is discussed. The results demonstrate the high variability in N leaching across Scotland. The
simulations suggest that, in the areas with greatest residual N, the losses of N are not
directly proportional to the amount of residual N, because of their coincidence with lower
rainfall. In the companion paper, the hydrological controls on N transport within NIRAMS are
described, and results of the full model testing are presented.
Keywords: nitrogen, diffuse pollution, agriculture, leaching, land use, model, national,
catchment |
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