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| Titel |
Comparison of flow resistance relations for debris flows using a one-dimensional finite element simulation model |
| VerfasserIn |
D. Naef, D. Rickenmann, P. Rutschmann, B. W. McArdell |
| 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 ; 6, no. 1 ; Nr. 6, no. 1 (2006-02-27), S.155-165 |
| Datensatznummer |
250003289
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| Publikation (Nr.) |
 copernicus.org/nhess-6-155-2006.pdf |
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| Zusammenfassung |
| This paper describes a one-dimensional finite element code for debris flows
developed to model the flow within a steep channel and the stopping
conditions on the fan. The code allows the systematic comparison of a wide
variety of previously proposed one-phase flow resistance laws using the same
finite element solution method. The one-dimensional depth-averaged equations
of motion and the numerical model are explained. The model and
implementation of the flow resistance relations was validated using
published analytical results for the dam break case. Reasonable agreement
for the front velocities and stopping location for a debris-flow event in
the Kamikamihori torrent in Japan can be achieved with turbulent flow
resistance relations including "stop" terms which allow the flow to come
to rest on a gently sloping surface. While it is possible to match the
overall bulk flow behavior using relatively simple flow resistance
relations, they must be calibrated. A sensitivity analysis showed that the
shape of the upstream input hydrograph does not much affect the flow
conditions in the lower part of the flow path, whereas the event volume is
much more important. |
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