SERIAL DISASTER IN NATSUI RIVER, HUKUSHIMA PREFECTURE DUE TO TYPHOON NO. 19 AND NO. 21, 2019

Abstract

 Continuous disasters occurred during short terms would cause more severe flood damage. In the present study, to consider how we should make disaster recovery, we investigated the disaster damages by the floods of Natsui River occurred due to the Typhoon No. 19 and No. 21 in 2019 based on the field surveys and numerical simulation. The field surveys clarified that the inundation area due to the Typhoon No. 19 was approximately 20 times of that due to the Typhoon No. 21 and the overflow due to the Typhoon No. 21 were confirmed at the same point where the levee collapsed due to the Typhoon No. 19. On the other hand, the numerical simulation indicates that it could be possible to occur the comparable inundation disaster with when flooding due to the Typhoon No. 19. Our results suggest that it is important to establish a strategy to evaluate flood risks and to develop a rapid restoration method of collapsed instructure in the future.