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Simulation of Debris Flow in Erodible Channels

Author(s): Giorgio Rosatti; Aronne Armanini; Luigi Fraccarollo

Linked Author(s): Aronne Armanini, Giorgio Rosatti

Keywords: Debris flow; Cfd; Finite volumes; Godunov’s method

Abstract: In this paper we present a two-dimensional model, developed at CUDAM, University of Trento, aimed at the study of debris flows on mobile bed. The mathematical model is based on a two-phase description of the flow with immediate adaptation of the transport to the local flow conditions and uses a rheological closure valid in the grain-inertia regime. The relevant system of partial differential equations is solved numerically by means of a Godunov-type, finite volume scheme, second order accurate in space and in time. It uses an approximated Riemann solver of LHLL type, which takes into account the non-conservative terms, and an implicit discretization of the bed shear-stress source terms. Two real-case applications show the capability of the code.

DOI:

Year: 2007

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