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| Titel |
Remotely sensed latent heat fluxes for model error diagnosis: a case study |
| VerfasserIn |
J. M. Schuurmans, F. C. Geer, M. F. P. Bierkens |
| 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 ; 15, no. 3 ; Nr. 15, no. 3 (2011-03-04), S.759-769 |
| Datensatznummer |
250012679
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| Publikation (Nr.) |
 copernicus.org/hess-15-759-2011.pdf |
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| Zusammenfassung |
| This study shows that remotely sensed ETact is useful in hydrological
modelling for the procedure of model calibration and shows it potential to
update soil moisture predictions. Comparison of modeled and remotely sensed
ETact together with the outcomes of our data assimilation procedure points
out potential model errors, both conceptual and flux-related. Assimilation
of remotely sensed ETact results in a realistic spatial adjustment of soil
moisture, except for the area where the model suffers from conceptual errors
(forest with deep groundwater levels). By using operational (i.e. available
for community in practice) data and models we aim to show the potential and
limitations of using remotely sensed ETact in the practice of hydrological
modelling. We use satellite data of both ASTER and MODIS for the same two
days in the summer of 2006 that, in association with the Surface Energy
Balance Algorithm for Land (SEBAL), provides us the spatial distribution of
daily ETact. The model, used by the local water board, is a physically based
distributed hydrological model of a small catchment (70 km2) in The
Netherlands that simulates the water flow in both the unsaturated and
saturated zone. Model outcomes of ETact show values that are at least 20%
lower than those estimated by SEBAL, which is due to the fact that different
evapotranspiration methods are used. The spatial pattern of ETact from the
hydrological model resembles the soil map, whereas the ETact from SEBAL
resembles the land use map. As both ASTER and MODIS images were available
for the same days, this study provides an opportunity to compare the worth
of these two satellite sources. It is shown that, although ASTER provides
better insight in the spatial distribution of ETact due to its higher
spatial resolution than MODIS, they appeared in this study just as useful. |
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