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| Titel |
Spatial and temporal predictions of soil moisture patterns and evaporative losses using TOPMODEL and the GASFLUX model for an Alaskan catchment |
| VerfasserIn |
P. F. Quinn, B. Ostendorf, K. Beven  , J. Tenhunen |
| 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 ; 2, no. 1 ; Nr. 2, no. 1, S.51-64 |
| Datensatznummer |
250000393
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| Publikation (Nr.) |
 copernicus.org/hess-2-51-1998.pdf |
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| Zusammenfassung |
| By using topographic indices as derived from a Digital
Terrain Models (DTM), it is possible to represent the heterogeneity within a landscape.
This heterogeneity can reflect both long term evolutionary patterns seen in a landscape
and the short term forcing of flow dynamics during storm events. By spatial analysis, the
linkage between the geomorphological- hydrological-plant physiological phenomena can be
examined. In this study, a direct link will be established between the
topographically-driven hydrological phenomena and the eco-physiological response. The
topographic distribution function of TOPMODEL is used to control the spatial and temporal
flux of the channel flow and water table. The plant physiological model GAS-FLUX is used
to give a spatially and temporally dissaggregated species-sensitive estimate of
evapotranspiration flux. Evapotranspiration is sensitive to the vegetation phonology, to
tundra community physiology and to the temperature regime. A simple linking of TOPMODEL
and the GAS-FLUX model is applied to a summer snow-free period to the Imnavait catchment,
Alaska (2.2 km2). A species-sensitive evapotranspiration model proved to give the highest
quality results when validated against flow observations. Predicted dynamics of variable
source area and the component hydrological processes are illustrated. |
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