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| Titel |
Impact of potential and (scintillometer-based) actual evapotranspiration estimates on the performance of a lumped rainfall–runoff model |
| VerfasserIn |
B. Samain, V. R. N. Pauwels |
| 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. 11 ; Nr. 17, no. 11 (2013-11-14), S.4525-4540 |
| Datensatznummer |
250085996
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| Publikation (Nr.) |
 copernicus.org/hess-17-4525-2013.pdf |
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| Zusammenfassung |
Evapotranspiration (ET) plays a key role in hydrological impact studies and
operational flood forecasting models as ET represents a loss of water from a
catchment.
Although ET is a major component of the catchment water balance, the
evapotranspiration input for rainfall–runoff models is often simplified in
contrast to the detailed estimates of catchment averaged precipitation.
In this study, an existing conceptual rainfall–runoff model calibrated for
and operational in the Bellebeek catchment in Belgium firstly has been
validated and its sensitivity to different available potential ET input has
been studied. It has been shown that when applying a calibrated
rainfall–runoff model, the model input should be consistent with the input
used for the calibration process, not only on the volume of ET, but also on
the seasonal pattern. Secondly, estimates of the actual evapotranspiration
based on measurements of a large aperture scintillometer (LAS) have been used
as model forcing in the rainfall–runoff model. From this analysis, it has
been shown that the actual evapotranspiration is a crucial factor in
simulating the catchment water balance and the resulting stream flow.
Regarding the actual evapotranspiration estimates from the LAS, it has been
concluded that they can be considered realistic in summer months. In the
months where stable conditions prevail (autumn, winter and (early) spring),
an underestimation of the actual evapotranspiration is made, which has an
important impact on the catchment's water balance. |
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