One-dimensional Finite Volume Simulation Of
Real Debris Flow Events
Author(s)
L. Schippa & S. Pavan
Abstract
A numerical model for the simulation of mud flow and debris flow is presented.
It is based on an alternative formulation of conservative balance equations, in
which source terms are mathematically reorganized in order to guarantee an
improved computational stability over complex geometry channels. For
numerical implementation, the first order Godunov scheme with Roe’s
approximation is used. Source terms are computed with Euler’s method and
added by splitting. Such a simple basic scheme has been chosen to underline that
the improved numerical stability depends on the proposed mathematical
formulation, and not on a sophisticated numerical scheme. The correct wet-dry
front velocity and propagation mechanism have been verified with standard
dam-break test cases, and particular attention has been directed to the celerity
computation inside the Roe’s scheme when dealing with irregularly shaped
cross-sections. The numerical model has already been verified with analytical
tests and laboratory experiments. In this work, the model is applied to two real
events that occurred in North-Eastern Italy. The first is a debris flow that took
place in the Upper Boite Valley, in the proximity of Cortina d’Ampezzo, in
1998, the second is a mud flow event located in the Stava Creek Valley in 1985.
These events have been chosen thanks to the wide documentation and significant
amount of field data available, which include topographical surveys, flow
velocity measures and flow depth estimations.
Keywords: mud flow, debris flow, wave propagation, source terms.
Keywords
mud flow, debris flow, wave propagation, source terms
Related Book
Other papers in this volume
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