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| Titel |
Influence of check dams on debris-flow run-out intensity |
| VerfasserIn |
A. Remaître, Th. W. J. Asch, J.-P. Malet, O. Maquaire |
| 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 ; 8, no. 6 ; Nr. 8, no. 6 (2008-12-12), S.1403-1416 |
| Datensatznummer |
250005912
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1403-2008.pdf |
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| Zusammenfassung |
Debris flows are very dangerous phenomena claiming thousands of lives and
millions of Euros each year over the world. Disaster mitigation includes
non-structural (hazard mapping, insurance policies), active structural
(drainage systems) and passive structural (check dams, stilling basins)
countermeasures. Since over twenty years, many efforts are devoted by the
scientific and engineering communities to the design of proper devices able
to capture the debris-flow volume and/or break down the energy. If
considerable theoretical and numerical work has been performed on the size,
the shape and structure of check dams, allowing the definition of general
design criteria, it is worth noting that less research has focused on the
optimal location of these dams along the debris-flow pathway.
In this paper, a methodological framework is proposed to evaluate the
influence of the number and the location of the check dams on the reduction
of the debris-flow intensity (in term of flow thickness, flow velocity and
volume). A debris-flow model is used to simulate the run-out of the debris
flow. The model uses the Janbu force diagram to resolve the force
equilibrium equations; a bingham fluid rheology is introduced and represents
the resistance term. The model has been calibrated on two muddy debris-flow
events that occurred in 1996 and 2003 at the Faucon watershed (South French
Alps).
Influence of the check dams on the debris-flow intensity is quantified
taking into account several check dams configurations (number and location)
as input geometrical parameters. Results indicate that debris-flow intensity
is decreasing with the distance between the source area and the first check
dams. The study demonstrates that a small number of check dams located near
the source area may decrease substantially the debris-flow intensity on the
alluvial fans. |
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