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| Titel |
On the use of the calibration-based approach for debris-flow forward-analyses |
| VerfasserIn |
M. Pirulli |
| 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 ; 10, no. 5 ; Nr. 10, no. 5 (2010-05-12), S.1009-1019 |
| Datensatznummer |
250008151
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1009-2010.pdf |
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| Zusammenfassung |
In the present paper the problem of modeling the propagation of potential
debris flows is tackled resorting to a numerical approach. In particular,
numerical analyses are carried out with the RASH3D code, based on a
single-phase depth-averaged continuum mechanics approach.
Since each numerical analysis requires the selection of a rheology and the
setting of the rheological input parameters, a calibration-based approach,
where the rheological parameters are constrained by systematic adjustment
during trial-and-error back-analysis of full-scale events, has been assumed.
The back-analysis of a 1000 m3 debris flow, located at Tate's Cairn, Hong
Kong, and the forward-analysis of a 10 000 m3 potential debris flow,
located in the same basin have been used to investigate the transferability
of back-calculated rheological parameters from one case to another. Three
different rheologies have been tested: Frictional, Voellmy and Quadratic.
From obtained results it emerges that 1) the back-calculation of a past event
with different rheologies can help in selecting the rheology that better
reproduces the runout of the analysed event and, on the basis of that
selection, can give some indication about the dynamics of the investigated
flow, 2) the use of back-calculated parameters for forward purposes requires
that past and potential events have similar characteristics, some of which
are a function of the assumed rheology. Among tested rheologies, it is
observed that the Quadratic rheology is more influenced by volume size than
Frictional and Voellmy rheologies and consequently its application requires
that events are also similar in volume. |
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