著者

沼本 晋也 鈴木 雅一 太田 猛彦

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.51, no.6, pp.3-12, 1999-03-15 (Released:2010-04-30)

参考文献数

27

被引用文献数

2

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We investigated the trends in the number of persons killed or missing by sediment disasters such as landslides and debris flows in the last fifty years in Japan. Since sediment disasters initiated by earthquakes and volcanic activity occurred intermittently and the deaths and missings caused by them were much less than caused by rainfall-triggered sediment disasters, it is appropriate to discuss trends in the number of persons killed or missing by heavy-rainfall related sediment disasters compared with trends in rainfall-triggered disasters including flood disasters. The number of persons killed or missing by both sediment disasters and heavy-rainfall related disasters has apparently been decreasing. The number of persons killed or missing by heavy-rainfall related disasters calculated as a ten-year running average exceeded 1000 persons/year in the 1950 s, 300 persons/year in the late 1960 s, and 100 persons/year in the 1990 s. Furthermore, the ratio of heavy-rainfall related sediment disaster victims to the heavy-rainfall related disaster victims has decreased from 2/3 in the 1970 s to 2/5 after the 1980 s.