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| Titel |
Modelling sediment export, retention and reservoir sedimentation in drylands with the WASA-SED model |
| VerfasserIn |
E. N. Mueller, A. Güntner, T. Francke, G. Mamede |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 3, no. 1 ; Nr. 3, no. 1 (2010-04-08), S.275-291 |
| Datensatznummer |
250000806
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| Publikation (Nr.) |
 copernicus.org/gmd-3-275-2010.pdf |
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| Zusammenfassung |
| Current soil erosion and reservoir sedimentation modelling at the meso-scale
is still faced with intrinsic problems with regard to open scaling questions,
data demand, computational efficiency and deficient implementations of
retention and re-mobilisation processes for the river and reservoir networks.
To overcome some limitations of current modelling approaches, the
semi-process-based, spatially semi-distributed modelling framework WASA-SED
(Vers. 1) was developed for water and sediment transport in large dryland
catchments. The WASA-SED model simulates the runoff and erosion processes at
the hillslope scale, the transport and retention processes of suspended and
bedload fluxes in the river reaches and the retention and remobilisation
processes of sediments in reservoirs. The modelling tool enables the
evaluation of management options both for sustainable land-use change
scenarios to reduce erosion in the headwater catchments as well as adequate
reservoir management options to lessen sedimentation in large reservoirs and
reservoir networks. The model concept, its spatial discretisation scheme and
the numerical components of the hillslope, river and reservoir processes are
described and a model application for the meso-scale dryland catchment
Isábena in the Spanish Pre-Pyrenees (445 km2) is presented to
demonstrate the capabilities, strengths and limits of the model framework.
The example application showed that the model was able to reproduce runoff
and sediment transport dynamics of highly erodible headwater badlands, the
transient storage of sediments in the dryland river system, the bed elevation
changes of the 93 hm3 Barasona reservoir due to sedimentation as well as
the life expectancy of the reservoir under different management options. |
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