平成21年7月中国・九州北部豪雨による山口県防府市土砂災害

概要

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A heavy rainstorm caused by a stationary front (Bai-u front) attacked Chugoku district and northern Kyushu district in late July 2009. Extra-ordinary intense rainstorm was recorded in Hofu city and Yamaguchi city of Yamaguchi Prefecture from 6am-12am of July 21, which could occur once in a period of 200-600 years statistically. It induced many debris flow disasters in Hofu city, claiming lives of 14 residents. Most of the debris flows were triggered by small-scale debris slides at the head of the stream, then scraping torrent deposits to increase its mass. Authors organized investigation team and conducted joint field investigation of debris flows on July 27 and July 31-August 1. This preliminary report includes the characteristics of the heavy rainstorm and general description of debris slide-debris flow sites.
2009-08-31