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| Titel |
Application of the SWAT model to an endorheic watershed in the Central Spanish Pre-Pyrenees: Methodological approach and preliminary results |
| VerfasserIn |
Leticia Gaspar, Sue White, Ana Navas, Manuel López-Vicente, Leticia Palazón |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072141
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| Zusammenfassung |
| Modelling runoff and sediment transport at watershed scale are key tools to predict
hydrological and sediment processes, identify soil sediment sources and estimate sediment
yield, with the purpose of better managing soil and water resources. This study aims to apply
the SWAT model in an endorheic watershed in the Central Spanish Pre-Pyrenees, where
there have been a number of previous field-based studies on sediment sources and
transfers.
The Soil and Water Assessment Tool (SWAT) is a process based semi-distributed
watershed scale hydrologic model, which can provide a high level of spatial detail by
allowing the watershed to be divided into sub-basins. This study addresses the challenge of
applying the SWAT model to an endorheic watershed that drains to a central lake, without
external output, and without a network of permanent rivers. In this case it has been shown that
the SWAT model does not correctly reproduce the stream network when using automatic
watershed delineation, even with a high resolution Digital Elevation Model (5 x 5
metres). For this purpose, different approaches needed to be considered, such as i)
user-defined watersheds and streams, ii) burning in a stream network or iii) modelling
each sub-watershed separately. The objective of this study was to develop a new
methodological approach for correctly simulating the main hydrological processes in an
endorheic and complex karst watershed of the Spanish Pre-Pyrenees. The Estanque
de Arriba Lake watershed (74 ha) is an endorheic system located in the Spanish
Central Pre-Pyrenees. This watershed holds a small and permanent lake of fresh
water (1.7 ha) and is a Site of Community Importance (European NATURA 2000
network). The study area is characterized by an abrupt topography with altitude
range between 679 and 862 m and an average slope gradient of 24 %. Steep slopes
(> 24 %) occupy the northern part of the watershed, whereas gentle slopes ( |
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