3D FLUID ANALYSIS FOR BRIDGE RUNOFF IN FLOOD FLOW

Abstract

 In recent years, the damage of bridge runoff in flood flow has increased. Therefore, it is necessary to investigate its mechanism and to reveal its countermeasures. In order to reveal the mechanism of bridge runoff, this paper has been investigating a mechanism of a bridge runoff in flood flow during the 2020 concentrated heavy rain at Kumamoto in Japan, by using a 3-dimensional numerical simulation method taking account for the river shape, the river bed shape and bridge. It has been found from flood forces acting on the bridge obtained by the 3-dimensional simulation that a bridge runoff mechanism can be estimated.