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Features of Slope-Movements due to Heavy Rainfalls in the SHIRASU Region of Southern Kyushu HARUYAMA, Motohisa open access erosion landslide Shirasu site investigation specal soil volcamic soil Baiu-fronts and typhoons passing through southern Kyushu and its adjacent area often bring about extraordinarily heavy rainfall, and, consequently, result dangerous floods and collapses of hill-slopes with Shirasu. Shirasu, which is widely distributed over souhern Kyushu, is very susceptible to water erosion and ready to collapse. This paper deals with the failure of hill-slope that occurs in the period of heavy rainfall. In this paper, the author classifies the failure of hill-slope into ten basic types according to the features of slope-movements and describes their causes for failures briefly. The hill-slopes with Shirasu are likely to be led to the most frequent collapses in the event of the rainfall exceeding about 300 mm during a spell of rain and in less than several hours after the time when the maximum hourly rainfall has occurred. 鹿児島大学 Kagoshima University 1974 eng departmental bulletin paper VoR http://hdl.handle.net/10232/00003747 https://ir.kagoshima-u.ac.jp/records/3755 04530853 AA00732376 Memoirs of the Faculty of Agriculture, Kagoshima University 10 151 163 https://ir.kagoshima-u.ac.jp/record/3755/files/KJ00000010631.pdf application/pdf 1.6 MB 2016-10-27 1974-03-20