POTENTIAL FOR SIMULTANEOUS INUNDATION IN MULTIPLE BASINS UNDER CLIMATE CHANGE ~A CASE STUDY OF KANTO REGION~

Abstract

 This study examined the possibility of large-scale inundation occurring in multiple watersheds. The Kanto region was used as a study case, and d4PDF (5 km, SI-CAT), a large-scale ensemble climate prediction data set, was used. Events that exceeded the designed rainfall were defined as rainfall events that could cause inundation, and were compared with other basins during periods when up to three days (two days) of annual rainfall occurred in the reference basin. As a result, in the future climate, rainfall events that generate the maximum annual climate will be prominent in the basins that are close to each other, but they also tend to increase in the entire Kanto region, increasing the possibility of simultaneous flooding.