In the last years, numerical modelling has emerged as a useful tool for landslide runout analysis and risk assessment. Several of the developed models have in-cluded innovations that have significantly advanced both the ability to simulate real events and the understanding of rapid landslide processes. However, it is here evidenced that in both interpreting run-out results and evaluating numerical model performances a particular care is necessary. To this aim, the continuum-mechanics based code RASH3D is used to back-analyse the case of the Baio Dora debris flow. Carried-out analyses are intended to highlight the influence that some factors like 1) Digital Elevation Model (DEM) resolution; 2) rheological law; and 3) entrainment process can have on numerical results. In particular, it is observed that a low resolution DEM can make fail all the at-tempts of selecting and calibrating the more appropriate rheology. On the other side, the selection of a wrong rheology can give a unrealistic run-out path, that is the moving mass can go as far taking a completely incorrect flowing direction. Fi-nally, it emerges that the entrainment of channel path material can significantly change the mobility of a flow, through rapid changes of both the flow volume and rheology.

On the use of numerical models for flow-like landslide simulation / Pirulli, Marina; Scavia, Claudio; Tararbra, M.. - STAMPA. - 2:(2015), pp. 1625-1628. (Intervento presentato al convegno XII Congress of the International Association of Engineering Geology and the Environment (IAEG) tenutosi a Torino nel 15-19 Settembre 2014) [10.1007/978-3-319-09057-3_289].

On the use of numerical models for flow-like landslide simulation

PIRULLI, MARINA;SCAVIA, Claudio;
2015

Abstract

In the last years, numerical modelling has emerged as a useful tool for landslide runout analysis and risk assessment. Several of the developed models have in-cluded innovations that have significantly advanced both the ability to simulate real events and the understanding of rapid landslide processes. However, it is here evidenced that in both interpreting run-out results and evaluating numerical model performances a particular care is necessary. To this aim, the continuum-mechanics based code RASH3D is used to back-analyse the case of the Baio Dora debris flow. Carried-out analyses are intended to highlight the influence that some factors like 1) Digital Elevation Model (DEM) resolution; 2) rheological law; and 3) entrainment process can have on numerical results. In particular, it is observed that a low resolution DEM can make fail all the at-tempts of selecting and calibrating the more appropriate rheology. On the other side, the selection of a wrong rheology can give a unrealistic run-out path, that is the moving mass can go as far taking a completely incorrect flowing direction. Fi-nally, it emerges that the entrainment of channel path material can significantly change the mobility of a flow, through rapid changes of both the flow volume and rheology.
2015
9783319090566
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2543292
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