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| Titel |
Technical Note: Alternative in-stream denitrification equation for the INCA-N model |
| VerfasserIn |
J. R. Etheridge, F. Birgand, M. R. Burchell II, A. Lepistö, K. Rankinen, K. Granlund |
| 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 ; 18, no. 4 ; Nr. 18, no. 4 (2014-04-16), S.1467-1473 |
| Datensatznummer |
250120336
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| Publikation (Nr.) |
 copernicus.org/hess-18-1467-2014.pdf |
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| Zusammenfassung |
| The Integrated Catchment model for Nitrogen (INCA-N) is a semi-distributed,
process based model that has been used to model the impacts of land use,
climate, and land management changes on hydrology and nitrogen loading. An
observed problem with the INCA-N model is reproducing low nitrate–nitrogen
concentrations during the summer growing season in some catchments. In this
study, the current equation used to simulate the rate of in-stream
denitrification was replaced with an alternate equation that uses a mass
transfer coefficient and the stream bottom area. The results of simulating
in-stream denitrification using the two different methods were compared for a
one year simulation period of the Yläneenjoki catchment in Finland. The
alternate equation (Nash–Sutcliffe efficiency = 0.61) simulated
concentrations during the periods of the growing season with the lowest flow
that were closer to the observed concentrations than the current equation
(Nash–Sutcliffe efficiency = 0.60), but the results were mixed during
other portions of the year. The results of the calibration and validation of
the model using the two equations show that the alternate equation will
simulate lower nitrate–nitrogen concentrations during the growing season
when compared to the current equation, but promote investigation into other
errors in the model that may be causing inaccuracies in the modeled
concentrations. |
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