Author(s): Takashi Inoue; Yuka Yamamura; Yasuo Nihei
Linked Author(s):
Keywords: Bridge damage; Floods; Risk assessment; Local scour; 2018 Western Japan Floods
Abstract: The 2018 Western Heavy Rainfall caused huge floods across a wide area of western Japan on July 5–8, 2018, followed by significant damage to people and their homes. In the Misasa River, which is a branch of the Oota River, Hiroshima prefecture, Japan, 22 out of 94 bridges were damaged by the flooding. The purpose of this study is to examine the characteristics of the bridge failures in the Misasa River. We also propose an index suitable for bridge damage assessment under heavy rainfall based on the longitudinal distribution of bridge damage in the Misasa River. From the results, it is statistically clear that the characteristics of the bridge damage can be related to the non-dimensional cross-sectional area (= cross-sectional area / upstream catchment area) and girder thickness / hydraulic radius. An evaluation procedure for bridge damage risk using these indicators is also examined on a trial basis.
Year: 2020