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| Titel |
Experimental and numerical study on the design of a deposition basin outlet structure at a mountain debris cone |
| VerfasserIn |
B. Gems, M. Wörndl, R. Gabl, C. Weber, M. Aufleger |
| 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 Sciences ; 14, no. 2 ; Nr. 14, no. 2 (2014-02-04), S.175-187 |
| Datensatznummer |
250118268
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| Publikation (Nr.) |
 copernicus.org/nhess-14-175-2014.pdf |
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| Zusammenfassung |
Mountain debris cones in the Alpine region often provide space for dense
population and cultivation. Hence, a great number of buildings are exposed
to torrential hazards. In order to protect the settlement areas against
flooding and overbank sedimentation, torrent defence structures are
implemented at various locations within catchments. Directly at the debris
cones, these protection measures often include a deposition basin at the fan
apex and/or a confined channel that passes through the settlement.
The work presented within this paper deals with the effect of specific outlet
structure layouts, situated at the lower end of a selected deposition basin,
on bed-load transport processes and flood protection. A case study analysis
was accomplished comprising a 3-D numerical model (FLOW-3D) and a physical
scale model test (1 : 30). The subject of investigation was the deposition
basin of the Larsennbach torrent in the Austrian Northern Limestone Alps. The
basin is situated on a large debris cone and opens out into a paved channel.
Since the basin is undersized and the accumulation of sediment in the outlet
section reduces the available cross section during floods, adjoining
settlements are considerably endangered of lateral overtopping of both clear
water and sediment. Aiming for an upgrade in flood protection, certain
layouts for a "closing-off structure" at the outlet were tested within this
project. For the most efficient design layout, its effect on flood
protection, a continuous bed-load output from the basin and the best possible
use of the retention volume are pointed out. The simple design of the
structure and the key aspects that have to be taken into consideration for
implementation are highlighted. |
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