Articles | Volume 10, issue 5
Nat. Hazards Earth Syst. Sci., 10, 989–997, 2010
https://doi.org/10.5194/nhess-10-989-2010

Special issue: Documentation and monitoring of landslides and debris flows

Nat. Hazards Earth Syst. Sci., 10, 989–997, 2010
https://doi.org/10.5194/nhess-10-989-2010

  10 May 2010

10 May 2010

Rheological investigation and simulation of a debris-flow event in the Fella watershed

M. A. Boniello1, C. Calligaris1, R. Lapasin2, and L. Zini1 M. A. Boniello et al.
  • 1Geosciences Department, University of Trieste, Trieste, Italy
  • 2DiCAMP, University of Trieste, Trieste, Italy

Abstract. 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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