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| Titel |
Evaluating the importance of surface soil contributions to reservoir sediment in alpine environments: a combined modelling and fingerprinting approach in the Posets-Maladeta Natural Park |
| VerfasserIn |
L. Palazón, L. Gaspar, B. Latorre, W. H. Blake, A. Navas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 2 ; Nr. 5, no. 2 (2014-09-08), S.963-978 |
| Datensatznummer |
250115338
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| Publikation (Nr.) |
 copernicus.org/se-5-963-2014.pdf |
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| Zusammenfassung |
| Soil in alpine environments plays a key role in the development of ecosystem
services and in order to maintain and preserve this important resource,
information is required on processes that lead to soil erosion. Similar to
other mountain alpine environments, the Benasque catchment is characterised
by temperatures below freezing that can last from November to April, intense
rainfall events, typically in spring and autumn, and rugged topography which
makes assessment of erosion challenging. Indirect approaches to soil erosion
assessment, such as combined model approaches, offer an opportunity to
evaluate soil erosion in such areas. In this study (i) the SWAT (Soil and
Water Assessment Tool) hydrological and erosion model and (ii) sediment
fingerprinting procedures were used in parallel to assess the viability of a
combined modelling and tracing approach to evaluate soil erosion processes in
the area of the Posets-Maladeta Natural Park (central Spanish Pyrenees). Soil
erosion rates and sediment contribution of potential sediment sources defined
by soil type (Kastanozems/Phaeozems; Fluvisols and Cambisols) were assessed.
The SWAT model suggested that, with the highest specific sediment yields,
Cambisols are the main source of sediment in the Benasque catchment and
Phaeozems and Fluvisols were identified as the lowest sediment contributors.
Spring and winter model runs gave the highest and lowest specific sediment
yield, respectively. In contrast, sediment fingerprinting analysis identified
Fluvisols, which dominate the riparian zone, as the main sediment source at
the time of sampling. This indicates the importance of connectivity as well
as potential differences in the source dynamic of material in storage versus
that transported efficiently from the system at times of high flow. The
combined approach enabled us to better understand soil erosion processes in
the Benasque alpine catchment, wherein SWAT identified areas of potential
high sediment yield in large flood events but sediment fingerprinting
identified areas that, due to high connectivity, contribute more to
channel-stored sediment deposits. |
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