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| Titel |
Sediment yield model implementation based on check dam infill stratigraphy in a semiarid Mediterranean catchment |
| VerfasserIn |
G. Bussi, X. Rodríguez-Lloveras, F. Francés, G. Benito, Y. Sánchez-Moya, A. Sopeña |
| 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 ; 17, no. 8 ; Nr. 17, no. 8 (2013-08-29), S.3339-3354 |
| Datensatznummer |
250085919
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| Publikation (Nr.) |
 copernicus.org/hess-17-3339-2013.pdf |
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| Zusammenfassung |
| Soil loss and sediment transport in Mediterranean areas are driven by
complex non-linear processes which have been only partially understood.
Distributed models can be very helpful tools for understanding the
catchment-scale phenomena which lead to soil erosion and sediment transport.
In this study, a modelling approach is proposed to reproduce and evaluate
erosion and sediment yield processes in a Mediterranean catchment (Rambla
del Poyo, Valencia, Spain). Due to the lack of sediment transport records
for model calibration and validation, a detailed description of the alluvial
stratigraphy infilling a check dam that drains a 12.9 km2 sub-catchment
was used as indirect information of sediment yield data. These dam infill
sediments showed evidences of at least 15 depositional events (floods) over
the time period 1990–2009. The TETIS model, a distributed conceptual
hydrological and sediment model, was coupled to the Sediment Trap Efficiency
for Small Ponds (STEP) model for reproducing reservoir retention, and it was
calibrated and validated using the sedimentation volume estimated for the
depositional units associated with discrete runoff events. The results show
relatively low net erosion rates compared to other Mediterranean catchments
(0.136 Mg ha−1 yr−1), probably due to the extensive outcrops of
limestone bedrock, thin soils and rather homogeneous vegetation cover. The
simulated sediment production and transport rates offer model satisfactory
results, further supported by in-site palaeohydrological evidences and
spatial validation using additional check dams, showing the great potential
of the presented data assimilation methodology for the quantitative analysis
of sediment dynamics in ungauged Mediterranean basins. |
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