EFFECT OF SEDIMENT YIELD ON INUNDATION FLOW ANALYSIS IN HILLSIDE CITIES

Abstract

An inundation flow model in hillside cities considering the effects of sediment is developed. In this model, the hydrographs of discharge and sediment concentration calculated in the mountainous area are imposed as the boundary conditions of urban area. In urban area, the two-dimensional inundation flow analysis based on the unstructured meshes is conducted. The above model is applied to Ikuta River basin in Kobe. The obtained results are much severer than those of the case without consideration of sediment. Therefore considering sediment is found out to be very important for inundation flow analysis in the river basin with much sediment yield.