Investigation of debris flow and damaged areas of 2014 Hiroshima landslide disaster

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  • TSUCHIDA Takashi
    Institute of Engineering, Graduate School of Engineering, Hiroshima University
  • MORIWAKI Takeo
    National Institute of Technology, Kure College
  • KUMAMOTO Naoki
    Department of Civil Engineering and Urban Design, Hiroshima Institute of Technology
  • ICHII Koji
    Institute of Engineering, Graduate School of Engineering, Hiroshima University
  • KANO Seiji
    National Institute of Technology, Kure College
  • NAKAI Shinji
    Disaster Prevention Department, Fukken Co., Ltd.

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  • 2014年広島豪雨災害において土石流が発生した渓流の状況と被害に関する調査

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On 20th August, 2014, a series of slope failures and debris flows were occurred around city of Hiroshima , Japan due to the torrential rainfall. Debris flows took place at 107 valleys and slope failures occurred at almost 59 locations between 3 am to 4 am. This calamitous event costs 74 lives and left 44 injured. This report consists of the investigation results and considerations of the debris flows and slopes failures in the affected areas. The investigated damages were compared with the damages predicted in the field survey which was carried out to designate the restricted area and the special restricted area due sediment-related disaster. It was found that the volumes of debris flows and the damages were much larger than those predicted in the survey, and the problems of the field survey and the designation system were discussed.

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