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| Titel |
Parameterization of a numerical 2-D debris flow model with entrainment: a case study of the Faucon catchment, Southern French Alps |
| VerfasserIn |
H. Y. Hussin, B. Quan Luna, C. J. Westen, M. Christen, J.-P. Malet, Th. W. J. Asch |
| 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 ; 12, no. 10 ; Nr. 12, no. 10 (2012-10-18), S.3075-3090 |
| Datensatznummer |
250011144
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| Publikation (Nr.) |
 copernicus.org/nhess-12-3075-2012.pdf |
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| Zusammenfassung |
| The occurrence of debris flows has been recorded for more than a century in
the European Alps, accounting for the risk to settlements and other human
infrastructure that have led to death, building damage and traffic
disruptions. One of the difficulties in the quantitative hazard assessment
of debris flows is estimating the run-out behavior, which includes the
run-out distance and the related hazard intensities like the height and
velocity of a debris flow. In addition, as observed in the French Alps, the
process of entrainment of material during the run-out can be 10–50 times
in volume with respect to the initially mobilized mass triggered at the
source area. The entrainment process is evidently an important factor that
can further determine the magnitude and intensity of debris flows. Research
on numerical modeling of debris flow entrainment is still ongoing and
involves some difficulties. This is partly due to our lack of knowledge of
the actual process of the uptake and incorporation of material and due
the effect of entrainment on the final behavior of a debris flow. Therefore,
it is important to model the effects of this key erosional process on the
formation of run-outs and related intensities. In this study we analyzed a
debris flow with high entrainment rates that occurred in 2003 at the Faucon
catchment in the Barcelonnette Basin (Southern French Alps). The historic
event was back-analyzed using the Voellmy rheology and an entrainment model
imbedded in the RAMMS 2-D numerical modeling software. A sensitivity analysis
of the rheological and entrainment parameters was carried out and the
effects of modeling with entrainment on the debris flow run-out, height and
velocity were assessed. |
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