A three dimensional numerical model was developed to predict the behavior of fine solids carried by flood water into a reservoir. The model is based on the standard k-ε turbulence model using the Boussinesq approximation and combined with a diffusion equation in which the settlement of fine solids is taken into account by using their terminal velocity relative to the surroundings. The model feasibility is tested for a flood caused by a typhoon in the reservoir where the authors have conducted detailed field measurements on turbidity current and sedimentation: the travel of fine solids in the reservoir during the flood was simulated for the whole process from the inflow at the upstream end to the deposition at the bottom of the reservoir. The calculation results successfully reproduced the observed profiles of turbidity currents and the spatial distribution of deposited sediment.
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