Abstract
Numerical simulations for flood flows and bed variation in a diversion of a river were performed using a quasi-three dimensional numerical model. The vertically averaged and moment equations was used as governing equations to allow for the incorporation of pre-assumed linear distribution of horizontal velocity distributions. The model is based on finite volume method using HLLC(Harten, Lax and van Leer and Contact(2004)) numerical flux, which is one of a Riemann solver. The model is verified against two experimental data of flows and bed variation in a diversion of a river. It shows that the model has ability to reproduce the flow and bed variation in a diversion of a river, but the more improvement is needed to predict reasonable accuracy.
