CONSTRUCTION OF QUASI TWO-DIMENSIONAL NUMERICAL MODEL FOR FLOOD FLOWS AND FLOOD FLOWS ANALYSIS IN THE HIKOSAN RIVER

Abstract

Quasi two-dimensional numerical model for flood flows was constructed. The model was based on two-dimensional shallow water equations and the flux by the normal direction of the boundary of control volume was used to deal with flow in river network like a one-dimensional model. The model was also based on flux-difference splitting scheme. The model was verified against observed water level and flood mark on the flood event in the Hikosan River and was compared with numerical results by 2D flood flow model. It shows that the quasi-2d model can reproduce the behavior of flood flows in the Hikosan River with reasonable accuracy.