2018年西日本豪雨における小田川の洪水氾濫プロセス

抄録

The western Japan heavy rain in 2018 caused huge flood in lower area of Oda River flowing near Mabi town, Kurashiki city, Okayama prefecture. This study aims to clarify the flood process in Oda River. For this, we conducted flood simulation using a coupled 1D and horizontally 2D hydraulic models for analyzing flows in rivers and flood plain, respectively. The results showed that high inundation depth and large rising-speed of the water level occurred due to a large amount of flooding water from breach points and the blockage effect of the levee in the tributaries of Oda River. It should be noted that the such a flood process affected the human damages in the flood disaster.