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[P-45] Investigation of typhoon no. 19 induced flood damages and historical characteristics of flood hazards around Yoshida River in Miyagi Prefecture, Japan

*Masakazu Hashimoto¹ (1. International Research Institute of Disaster Science, Tohoku University, Japan)

Keywords:Investigation of typhoon no. 19

Typhoon no. 19/(Typhoon Hagibis) which was one of the strongest to make landfall in Japan in several decades caused severe flooding in eastern Japan in October 2019. The Yoshida River that flows through Miyagi Prefecture also suffered severely from the flooding. In this context, we examined the historical background of the flood inundation due to a dyke breach at Kasukawa area in Osato-cho, Miyagi prefecture. In order to understand the flooding processes and the damage scenario, we conducted a field survey of the affected area. Historical data and documents were collected and analyzed especially regarding the flood in 1986. Additionally, we alsoperformed numerical simulations to further understand the floodand inundation characteristics considering both with and without dyke breach. This study revealed clear change in the historical flood hazard and also depicted the impact of dyke breach in increasing the extent of the flood damage.