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

Andrea M. Deganutti, Pia R. Tecca and Giuseppe Nigro
Comparative numerical modelling of a debris-flow fan in the eastern Italian Alps (in Geology and geomorphology of alluvial and fluvial fans; terrestrial and planetary perspectives, D. Ventra (editor) and L. E. Clarke (editor))
Special Publication - Geological Society of London (June 2017) 440 (1): 201-213

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.


ISSN: 0305-8719
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 440
Serial Issue: 1
Title: Comparative numerical modelling of a debris-flow fan in the eastern Italian Alps
Title: Geology and geomorphology of alluvial and fluvial fans; terrestrial and planetary perspectives
Author(s): Deganutti, Andrea M.Tecca, Pia R.Nigro, Giuseppe
Author(s): Ventra, D.editor
Author(s): Clarke, L. E.editor
Affiliation: CNR, Research Institute for Hydrological and Geological Hazard Prevention, Padua, Italy
Pages: 201-213
Published: 20170613
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 51
Accession Number: 2017-074516
Categories: Engineering geologyGeomorphology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N46°24'27" - N46°24'27", E13°01'03" - E13°01'03"
Secondary Affiliation: University of Padova, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201739
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