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| Titel |
Seasonal evaluation of the land surface scheme HTESSEL against remote sensing derived energy fluxes of the Transdanubian region in Hungary |
| VerfasserIn |
E. L. Wipfler, K. Metselaar, J. C. Dam, R. A. Feddes, E. Meijgaard, L. H. Ulft, B. Hurk, S. J. Zwart, W. G. M. Bastiaanssen |
| 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. 4 ; Nr. 15, no. 4 (2011-04-20), S.1257-1271 |
| Datensatznummer |
250012750
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| Publikation (Nr.) |
 copernicus.org/hess-15-1257-2011.pdf |
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| Zusammenfassung |
The skill of the land surface model HTESSEL is assessed to reproduce
evaporation in response to land surface characteristics and atmospheric
forcing, both being spatially variable. Evaporation estimates for the 2005
growing season are inferred from satellite observations of the Western part
of Hungary and compared to model outcomes. Atmospheric forcings are obtained
from a hindcast run with the Regional Climate Model RACMO2. Although HTESSEL
slightly underpredicts the seasonal evaporative fraction as compared to
satellite estimates, the mean, 10th and 90th percentile of this
variable are of the same magnitude as the satellite observations. The
initial water as stored in the soil and snow layer does not have a
significant effect on the statistical properties of the evaporative
fraction. However, the spatial distribution of the initial soil and snow
water significantly affects the spatial distribution of the calculated
evaporative fraction and the models ability to reproduce evaporation
correctly in low precipitation areas in the considered region. HTESSEL
performs weaker in dryer areas. In Western Hungary these areas are situated
in the Danube valley, which is partly covered by irrigated cropland and
which also may be affected by shallow groundwater. Incorporating (lateral)
groundwater flow and irrigation, processes that are not included now, may
improve HTESSELs ability to predict evaporation correctly. Evaluation of the
model skills using other test areas and larger evaluation periods is needed
to confirm the results.
Based on earlier sensitivity analysis, the effect of a number of
modifications to HTESSEL has been assessed. A more physically based
reduction function for dry soils has been introduced, the soil depth is made
variable and the effect of swallow groundwater included. However, the
combined modification does not lead to a significantly improved performance
of HTESSEL. |
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