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| Titel |
SEPAL – a simple GIS-based tool to estimate sediment pathways in lowland catchments |
| VerfasserIn |
J. Kiesel, B. Schmalz, N. Fohrer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Transdisciplinary concepts and modelling strategies for the assessment of complex environmental systems ; Nr. 21 (2009-08-10), S.25-32 |
| Datensatznummer |
250014526
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| Publikation (Nr.) |
 copernicus.org/adgeo-21-25-2009.pdf |
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| Zusammenfassung |
| Even though soil loss in the lowlands imposes not as much a restriction on
land use and agricultural productivity as in erosion affected mountainous
areas, the input of fine sediment into the rivers and streams is a concern
due to water quality issues and substrate siltation. Drains, river banks and
agricultural fields are the three main sources of fine sediment in lowland
regions. For a successful implementation of measures to decrease sediment
input a well-founded knowledge of the individual entry pathways is
essential. To assess the importance of possible entry pathways, a GIS based
methodology (SEPAL) has been established combining the ABAG, a river bank
erosion formula and a regression approach to include the contributions of
drains. SEPAL has been applied on a study catchment in Northern Germany. The
results show that 15% of the sediment input into the river comes from
agricultural drains, 71% from river banks and 14% from adjacent
fields. A comparison of the results with field-mapping and -sampling shows
that the approach is plausible. The calculated total annual sediment input
is 616 t yr−1, while the measured suspended sediment load is
636 t yr−1. It can be concluded that the methodology is suitable for
estimating sediment entry pathways and annual sediment loads in lowland
catchments as a base for modelling projects and further investigations.
However, further work is necessary for gaining sound knowledge about
uncertainties and especially about the processes forcing sediment input from
drains. |
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