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| Titel |
Rheological investigation and simulation of a debris-flow event in the Fella watershed |
| VerfasserIn |
M. A. Boniello, C. Calligaris, R. Lapasin, L. Zini |
| 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 (2010-05-10), S.989-997 |
| Datensatznummer |
250008149
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| Publikation (Nr.) |
 copernicus.org/nhess-10-989-2010.pdf |
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| Zusammenfassung |
| To set an approach for the future territorial planning, the
Geological Survey of Friuli Venezia Giulia Region, through the
researchers of Trieste University, started a program of debris-flow
risk analysis using Flo-2D software as tool to delimit the hazardous
areas. In the present paper, as a case study, a debris flow, called
Fella sx, occurring in a torrent catchment was analyzed. The choice
was due to the abundance of information about past events, inundated
areas, rain fall, geology and to its representativeness. An initial
back-analysis investigation identified a couple of representative
rheological parameters. Riverbed samples were collected, sieve
analyses were performed and rheological tests were carried out on
the fraction finer than 0.063 mm using a rotationally controlled
stress rehometer equipped with the serrated parallel plate geometry.
The shear dependent behaviour was examined at different
concentrations ranging from 33 to 48%, by weight. Viscosity data
treatment was performed to determine the most suitable rheological
model to provide the best approximation of the debris-flow
behaviour. The rheological parameters, derived from experimental
data, were used and compared with those obtained through the
back-analysis and with the real inundated area. Data obtained
through rheological analysis are useful in constructing scenarios of
future events where no data for back-analysis are available. |
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