Comparisons of Levee Breach and Successive Disasters in Floodplain between Bangladesh and Japan

Abstract

Flood disaster is caused by levee breach due to high river flow and consequences as huge damage occurs in the inhabitants inside the levees. Thus it is important to recognize the process of levee breaching and inundation; and we have attempted to do through numerical simulation. As for simulation scheme, schematic model area is considered with main channel, levee and floodplain composed of same materials. The channel and flow parameters are selected in conformity with the typical model field of Bangladesh as well as Japan. And RIC-Nays, a two-dimensional numerical model for flood flow and morphology is utilized in this study upon confirmation through other numerical study. Based on the calculated results, evolution process of levee breach and inundation of water and sedimentation in the floodplain are investigated. Levee breach is considered to initiate in the middle of the levee with crest opening.