Technical Report
LEVEE BREACH OF ARAKAWA RIVER IN THE NAKAGAWA RIVER SYSTEM BY TYPHOON HAGIBIS IN 2019
2022 年 10 巻 1 号 p. 96-101
詳細
2022 年 10 巻 1 号 p. 96-101
The heavy rainfall from 10th to 13th October 2019, due to Typhoon Hagibis, caused numerous disasters in various parts of eastern Japan. In Tochigi Prefecture, the maximum one-hour rainfall was 58mm and 52.5mm, and total rainfall for three days was 423mm and 512.5mm at the Shioya and Okunikkou weather station, respectively. Consequently, 27 levee breaches occurred in 13 rivers. In the present study, field survey and numerical simulation were performed to clarify the complicated behavior of inundation flow in Arakawa river in the Nakagawa river system, where the levee breach occurred due to the inundation overflow from the landside to the riverside. Moreover, this flow influenced the opposite-side levee breach.
