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| Titel |
Nitrogen Risk Assessment Model for Scotland: II. Hydrological transport and model testing |
| VerfasserIn |
S. M. Dunn, A. Lilly, J. DeGroote, A. J. A. Vinten |
| 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.205-219 |
| Datensatznummer |
250005497
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| Publikation (Nr.) |
 copernicus.org/hess-8-205-2004.pdf |
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| Zusammenfassung |
| The amount and concentration of N in catchment runoff is strongly controlled
by a number of hydrological influences, such as leaching rates and the rate of transport of N
from the land to surface water bodies. This paper describes how the principal hydrological
controls at a catchment scale have been represented within the Nitrogen Risk Assessment Model
for Scotland (NIRAMS); it demonstrates their influence through application of the model to eight
Scottish catchments, contrasting in terms of their land use, climate and topography. Calculation
of N leaching rates, described in the preceding paper (Dunn et al., 2004), is based on
soil water content determined by application of a weekly water balance model. This model uses
national scale datasets and has been developed and applied to the whole of Scotland using five
years of historical meteorological data. A catchment scale transport model, constructed from a
50m digital elevation model, routes flows of N through the sub-surface and groundwater to the
stream system. The results of the simulations carried out for eight different catchments
demonstrate that the NIRAMS model is capable of predicting time-series of weekly stream flows
and N concentrations, to an acceptable degree of accuracy. The model provides an appropriate
framework for risk assessment applications requiring predictions in ungauged catchments and
at a national scale. Analysis of the model behaviour shows that streamwater N concentrations
are controlled both by the rate of supply of N from leaching as well as the rate of transport
of N from the land to the water.
Keywords: nitrogen, diffuse pollution, hydrology, model, transport, catchment |
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