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| Titel |
Modelling catchment hydrology within a GIS based SVAT-model framework |
| VerfasserIn |
R. Ludwig, W. Mauser |
| 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 ; 4, no. 2 ; Nr. 4, no. 2, S.239-249 |
| Datensatznummer |
250001631
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| Publikation (Nr.) |
 copernicus.org/hess-4-239-2000.pdf |
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| Zusammenfassung |
| The physically-based soil-vegetation-atmosphere-transfer model PROMET
(PRocess-Oriented Model for Evapo Transpiration) developed at the Institute of Geography,
University of Munich, is applied to the Ammer basin (approx. 600 km2 ) in the
alpine foreland of Germany. The hourly actual evapotranspiration rate is calculated for
a 14-year time series. A rainfall-runoff model, based on an enhanced distributed TOPMODEL
structure, is linked to the SVAT-model in order to provide a hydrological model covering
the water-cycle at the basin scale in a 30m-resolution. The model is driven with
meteorological data taken from regular synoptic stations of the German Weather Service.
Soil physical and plant physiological parameters for the SVAT model were either measured
at the test site or taken from literature. The topographical parameters were derived from
detailed digital terrain analysis. The study intends to combine, within a GIS-based model
framework, the understanding and application of physical processes inherent in the basin
such as the spatial distribution and temporal evolution of evapotranspiration and runoff
patterns. The influence of an evapotranspiration coefficient ETcoeff,
implemented in the formulation of the soil-topographic-index, to account for seasonal
dynamics in distributed runoff formation due to the annual course of vegetation activity
is investigated. The SVAT model shows convincing results in the long-term water balance
description with a mean annual deviation of less then 6% over a fourteen year time period.
Introducing the evapotranspiration-soil-topographic-index αET leads
to a considerable improvement; the runoff model component simulating the daily runoff over
the year reaches an efficiency of ε = 0.92.
Keywords: Water cycle; Geographic Information System; SVAT; TOPMODEL |
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