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Book Chapter

Comparative numerical modelling of a debris-flow fan in the Eastern Italian Alps

By
Andrea M. Deganutti
Andrea M. Deganutti
Research Institute for Hydrological and Geological Hazard Prevention-CNR, Cso Stati Uniti 4, 35127, Padova, Italy
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Pia R. Tecca
Pia R. Tecca
Research Institute for Hydrological and Geological Hazard Prevention-CNR, Cso Stati Uniti 4, 35127, Padova, Italy
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Giuseppe Nigro
Giuseppe Nigro
Department of Geosciences, University of Padova, Via Gradenigo 6, 35131 Padova, Italy
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Published:
January 01, 2018

Abstract

Knowledge of rheology can reduce damage caused by debris flows, providing a means to delineate hazard-prone areas and to estimate the dangerous effects of these phenomena. The application of numerical models of debris-flow propagation and deposition for hazard prediction requires detailed topographical, hydrological and rheological data, which are not always available. The large Rivoli Bianchi Fan on the Eastern Italian Alps is mainly built from sediment transported by debris flows along the Citate Torrent and its tributaries. We compared the results of numerical simulations performed with two different single-phase, non-Newtonian, two-dimensional models, FLO-2D and IDRA2D-DF, to test their reliability in simulating the behaviour of debris flows on alluvial fans. Data from field topographic surveys and from rain gauges were used as input for the boundary conditions, referring to the Rivoli Bianchi Fan as an example location. The commercial FLO-2D model creates a more accurate representation of the hazard-prone zone in terms of flooded area, but the results in terms of runout distances and deposit thickness are similar to those obtained through the open-source IDRA2D-DF. Parameters obtained through back analysis with both models can be cautiously applied to predict hazard in areas of similar geology, morphology and climate.

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Contents

Geological Society, London, Special Publications

Geology and Geomorphology of Alluvial and Fluvial Fans: Terrestrial and Planetary Perspectives
CONTAINS OPEN ACCESS

D. Ventra
D. Ventra
Utrecht University, the Netherlands
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L. E. Clarke
L. E. Clarke
University of Gloucestershire, UK
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Geological Society of London
Volume
440
ISBN electronic:
9781786203809
Publication date:
January 01, 2018

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