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| Titel |
Assessing potential debris flow runout: a comparison of two simulation models |
| VerfasserIn |
M. Pirulli, G. Sorbino |
| 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. 4 ; Nr. 8, no. 4 (2008-08-29), S.961-971 |
| Datensatznummer |
250005666
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| Publikation (Nr.) |
 copernicus.org/nhess-8-961-2008.pdf |
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| Zusammenfassung |
| In the present paper some of the problems related to the application of the
continuum mechanics modelling to debris flow runout simulation are
discussed.
Particularly, a procedure is proposed to face the uncertainties in the
choice of a numerical code and in the setting of rheological parameter
values that arise when the prediction of a debris flow propagation is
required.
In this frame, the two codes RASH3D and FLO2D are used to numerically
analyse the propagation of potential debris flows affecting two study sites
in Southern Italy.
For these two study sites, a lack in information prevents that the
rheological parameters can be obtained from the back analysis of similar
well documented debris flow events in the area. As a prediction of the
possible runout area is however required by decision makers, an alternative
approach based on the analysis of the alluvial fans existing at the toe of
the two studied basins is proposed to calibrate rheological parameters on
the safe side.
From the comparison of the results obtained with RASH3D (where a Voellmy and
a Quadratic rheologies are implemented) and FLO2D (where a Quadratic
rheology is implemented) it emerges that, for the two examined cases,
numerical analyses carried out with RASH3D assuming a Voellmy rheology can
be considered on the safe side respect to those carried out with a Quadratic
rheology. |
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