Operative Approaches For Debris Flow
Modelling And Hazard Assessment,
Laures Watershed, Valle D’Aosta, Italy
Author(s)
M. Segato, L. Mao, M. Coccato, M. A. Lenzi & V. D’Agostino
Abstract
Here is presented a comparative application of different simple methods for
preliminary hazard mapping in debris flow prone areas. The analysis is carried
out in the Laures fan, a 17.2 km 2 basin in the Western Italian Alps. The applied
methods support increasing complexities, starting from the use of a simplified
hydraulic approach for the identification of the critical cross-sections and the
overflow volume to the use of a 2-D model that provides a hazard map from the
overlay of maximum flow thickness and velocity maps. If integrated with a deep
knowledge of the fan area, the first approach allows a reasonable preliminary
debris flow hazard mapping. The use of a 2-D hydrodynamic model is
recommended if inhabited area or important communications are located in the
fan, thus a more accurate hazard mapping is required.
Keywords: alps, debris flow, hazard mapping, 2-D model.
1 Introduction
Debris flows are one of the most hazardous natural phenomena in the European
Alps. Debris flows frequently reaches the mountains alluvial fans, where
commonly houses, infrastructures, and crops are located, and where the channel
slope becomes milder thus allowing debris deposition and causing backwater
effects and upstream flooding. Even if these events regularly cause loss of life,
and disruption of livelihood and communications, in Europe there are still no
uniform approach and available quantitative techniques for limit this hazard.
Keywords
alps, debris flow, hazard mapping, 2-D model.
Related Book
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