NUMERICAL SIMULATIONS IN A ALLUVIAL CHANNEL NETWORK

摘要

A numerical model, which is capable of simulating scouring and deposition behaviors in a channel network, is developed in this study. The model treats suspended load and bed load separately ,and hence is able to simulate the depositional behavior of the suspended sediment under a nonequilibrium process. The model solves the de Saint Venant equation, and thus can be applied to unsteady flow conditions. An internal boundary condition based on the sediment transport capacity was proposed to distribute the incoming sediment load into the downstream links. The application of this model to the Tanhsui River system in Taiwan gave very convincing results.