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| Titel |
Modelling nitrogen and phosphorus loads in a Mediterranean river catchment (La Tordera, NE Spain) |
| VerfasserIn |
F. Caille, J. L. Riera, A. Rosell-Melé |
| 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 ; 16, no. 8 ; Nr. 16, no. 8 (2012-08-03), S.2417-2435 |
| Datensatznummer |
250013403
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| Publikation (Nr.) |
 copernicus.org/hess-16-2417-2012.pdf |
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| Zusammenfassung |
| Human activities have resulted in increased nutrient levels in many rivers
all over Europe. Sustainable management of river basins demands an
assessment of the causes and consequences of human alteration of nutrient
flows, together with an evaluation of management options. In the context of
an integrated and interdisciplinary environmental assessment (IEA) of
nutrient flows, we present and discuss the application of the nutrient
emission model MONERIS (MOdelling Nutrient Emissions into River Systems) to
the Catalan river basin, La Tordera (north-east Spain), for the period
1996–2002. After a successful calibration and verification process
(Nash-Sutcliffe efficiencies E=0.85 for phosphorus and E=0.86 for nitrogen),
the application of the model MONERIS proved to be useful in estimating
nutrient loads. Crucial for model calibration, in-stream retention was
estimated to be about 50 % of nutrient emissions on an annual basis.
Through this process, we identified the importance of point sources for
phosphorus emissions (about 94% for 1996–2002), and diffuse sources,
especially inputs via groundwater, for nitrogen emissions (about 31% for
1996–2002). Despite hurdles related to model structure, observed loads, and
input data encountered during the modelling process, MONERIS provided a good
representation of the major interannual and spatial patterns in nutrient
emissions. An analysis of the model uncertainty and sensitivity to input
data indicates that the model MONERIS, even in data-starved Mediterranean
catchments, may be profitably used by water managers for evaluating
quantitative nutrient emission scenarios for the purpose of managing
river basins. As an example of scenario modelling, an analysis of the changes
in nutrient emissions through two different future scenarios allowed the
identification of a set of relevant measures to reduce nutrient loads. |
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