著者
Hideaki Goto Yasuhiro Kumahara Shoichiro Uchiyama Yoshiya Iwasa Tomoru Yamanaka Rinako Motoyoshi Shun Takeuchi Sho Murata Takashi Nakata
出版者
Fuji Technology Press Ltd.
雑誌
Journal of Disaster Research (ISSN:18812473)
巻号頁・発行日
vol.14, no.6, pp.894-902, 2019-09-01 (Released:2019-09-01)
参考文献数
12
被引用文献数
7

Record-breaking heavy rainfall in July 2018 caused an extremely large number of slope movements over a broad area of western Japan. We mapped the distribution of slope movements in the southern part of Hiroshima Prefecture through an interpretation of aerial photographs that were acquired after the rainfall by the Geospatial Information Authority of Japan, and counted a total of 8,497 slope-movement starting points. The widespread distribution of slope movements – from Etajima City of Hiroshima Prefecture to Kasaoka City of Okayama Prefecture – suggests that the heavy rain affected a very large area. The starting points of debris flow during this disaster were commonly close to the crest of mountain ranges. We compared the distribution of slope movements to the 24-hr rainfall accumulation during the heaviest rainfall event to clarify the factors that caused regional difference in slope-movement distribution. We found the area of highest density of the slope movements was consistent with the area receiving a cumulative rainfall of >250 mm. This observation indicated that the position of slope-movement starting points was not related to differences in geology.

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山口県東部から広島県西部にかけての広範囲で、11時までの24時間降水量が300mmを超えている。2018年西日本豪雨では24時間降水量が300mmを超えた地域で土石流が多発した。かなり心配。 論文のリンクはこちら。 https://t.co/bjBfbnbcca https://t.co/UQ1hqZPQiY

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