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| Titel |
Physical and numerical modelling of a bedload deposition area for an Alpine torrent |
| VerfasserIn |
R. Kaitna, M. Chiari, M. Kerschbaumer, H. Kapeller, J. Zlatic-Jugovic, M. Hengl, J. Huebl |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 6 ; Nr. 11, no. 6 (2011-06-01), S.1589-1597 |
| Datensatznummer |
250009479
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| Publikation (Nr.) |
 copernicus.org/nhess-11-1589-2011.pdf |
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| Zusammenfassung |
| Floods including intensive bedload transport represent a severe hazard to
the often densely populated alluvial fans of small Alpine watersheds. In
order to minimize the risk of future inundation, an existing bedload
deposition area on the fan upstream of the village Vorderberg in southern
Austria is planned for reconstruction. The suggested concept for protection
measures includes dividing the area into three similar sections of reduced
slope. The three sections are to be separated by a block ramp. To test this
concept and to optimize the sedimentation process, an analysis was performed
by using both a physical scale model (1:30) and a numerical simulation
tool (SETRAC). Four configurations for the section-outlet were tested based
on three flood scenarios. The results support the general protection concept
and suggest a minimum construction configuration, including a woody debris
filter. Employing a physical scale model for analysing small watershed
processes is rarely found in literature. This contribution represents an
applied study and provides quantitative information on bedload deposition
and outflow from a deposition area. We test a novel simulation tool for
bedload transport on the steep slopes against the measurements in the laboratory and
show that the combination of physical and numerical modelling is a valuable
tool to evaluate the efficiency of planned measures for torrent hazard
mitigation. |
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