ABSTRACT
A heavy rainfall generated by a stationary front in rainy season attacked northern Kyushu district in July 3-14, 2012. Extreme rainfall event was recorded particularly in Aso city of Kumamoto prefecture, which could occur in a return period of 130 years statistically. It induced flood inundation and/or debris flow disasters in this river basin, and resulted in the number of killed or missing people 25. In this paper, we investigated the flood inundation in detail by hydraulic model experiments and clarified the main factors that affect death or injury to people during floods, which include flow velocity, flow depth, and the degree to which people are exposed to the flood on evacuation routes.
