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| Titel |
Three perceptions of the evapotranspiration landscape: comparing spatial patterns from a distributed hydrological model, remotely sensed surface temperatures, and sub-basin water balances |
| VerfasserIn |
T. Conradt, F. Wechsung, A. Bronstert |
| 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 ; 17, no. 7 ; Nr. 17, no. 7 (2013-07-25), S.2947-2966 |
| Datensatznummer |
250018947
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| Publikation (Nr.) |
 copernicus.org/hess-17-2947-2013.pdf |
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| Zusammenfassung |
| A problem encountered by many distributed hydrological modelling
studies is high simulation errors at interior gauges when the model is
only globally calibrated at the outlet. We simulated river runoff in
the Elbe River basin in central Europe (148 268 km2) with
the semi-distributed eco-hydrological model SWIM (Soil and Water Integrated Model). While
global parameter optimisation led to Nash–Sutcliffe efficiencies of
0.9 at the main outlet gauge, comparisons with measured runoff series
at interior points revealed large deviations. Therefore, we compared
three different strategies for deriving sub-basin evapotranspiration:
(1) modelled by SWIM without any spatial calibration,
(2) derived from remotely sensed surface temperatures, and
(3) calculated from long-term precipitation and discharge data. The
results show certain consistencies between the modelled and the remote
sensing based evapotranspiration rates, but there seems to be no
correlation between remote sensing and water balance based
estimations. Subsequent analyses for single sub-basins identify
amongst others input weather data and systematic error amplification
in inter-gauge discharge calculations as sources of uncertainty.
The results encourage careful utilisation of different data sources
for enhancements in distributed hydrological modelling. |
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