Numerical Modelling Of Transient Flows With
High Sediment Concentrations
Author(s)
B. J. Dewals, S. Erpicum & M. Pirotton
Abstract
The main purpose of the present paper is to describe and discuss the
development, validation and application of a numerical model designed to handle
transient flows with high sediment transport rates. The model considers nonequilibrium
transport (i.e. accounting for loading/unloading delay) and is
numerically as well as physically totally coupled. The closure relations needed to
evaluate the exchange fluxes between the fixed bottom and the flowing mixture
(erosion and deposition rates) are also detailed in the paper. Finally, the model is
validated against experimental data collected in the framework of the European
project IMPACT.
Keywords: sediment transport, depth-averaged flow modelling, finite volume,
erosion rate, dam break on an erodible topography.
1 Introduction
Conventional models for flow and sediment transport usually consider a weak
numerical and physical coupling between the sub-models for hydrodynamics and
for sediment transport. However, in numerous cases of intense transport
conditions, such as debris flows but also flows caused by dam breaks occurring
in erodible valleys, the above-mentioned loose coupling is not valid. In
particular, many historical dam break events in the world are known to have
induced highly erosive flows, which in turn caused significant scouring in the
downstream valley, both in the floodplains and on other structures (e.g. dam
breaching in cascade).
For the purpose of modelling such flows, characterized by extremely high
sediment loads, the sub-models for hydrodynamics and sediment transport need
Keywords
sediment transport, depth-averaged flow modelling, finite volume,
erosion rate, dam break on an erodible topography.
Related Book
Other papers in this volume
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