Abstract
A two-dimensional numerical model for a bed variation is constructed based on the finite-volume method (FVM), flux-difference splitting (FDS) and unstructured grid system. In the model, the effect of gravity associated with the slope angle in longitudinal and lateral directions on the sediment transport, mechanism of slope-collapse so as to keep the local slope angle be equaled to or less than the angle of response and technique of treatment of mobile as well as fixed bed are considered. The model verified against the experimental data of a channel formation process during flushing sediments through the reservoir. It shows that the model has ability to reproduce the channel formation process, but the more improvement is needed to predict the channel formation process with reasonable accuracy.
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