2020 Volume 76 Issue 1 Pages 346-351
The heavy rainfall from 10th to 13th October 2019 in various parts of eastern Japan occurred due to Typhoon Hagibis and caused numerous disasters. In Tochigi Prefecture, the maximum 1-hour rainfall was 58mm and 52.5mm, and total rainfall for 3 days was 423mm and 512.5mm at the Shioya and Okunikkou weather station respectively. 27 levee breach in 13 rivers occurred due to this heavy rainfall. The field survey and numerical simulation were performed to clarify behavior of the inundation in Arakawa river in Nakagawa river system. The levee breach occurred due to the overflow of inundation flow from landside to riverside. Moreover, this flow influenced the opposite-side levee breach.
PROCEEDINGS OF HYDRAULIC ENGINEERING
