TWO-DIMENSIONAL NUMERICAL MODEL BASED ON UNSTRUCTURED FINITE VOLUME METHOD USING APPROXIMATE RIEMAN SOLVER FOR SEDIMENT TRANSPORT

Abstract

Numerical models for 2D free-surface flows and sediment transport are developed. The models are based on finite volume method using HLL (Harten, Lax and van Leer(1983)) numerical flux, which are based on approximate Riemann solver. These models deal with the system equation formed by the 2D shallow water equations and the Exner equation as a coupled or decoupled system. These models are verified against two experimental data of unsteady dam-break flow over erodible bed. It shows that the models can reproduce the complex behavior of the flows and sediment transport with reasonable accuracy.