ID | 52164 |
JaLCDOI | |
Sort Key | 3
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Title Alternative | Debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture
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FullText URL | |
Author |
Kimura, Yuki
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Abstract | The debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture caused by the hard
rain of Typhoon 12 of September, 2011. Furthermore, 11 small landslides occurred in the study area. In this
area, the altitude of mountainous are not so high (150m to 250m) and the amount of precipitation which
producted the debris avalanche was not very serious quantity with 230mm. However the debris avalanche
occurred. One private house collapsed, and the first floor part of the Kitamura Elementary School was buried
due to the debris flow. The purpose of this study is to examine causes of the debris avalanche disaster
occurred in Kitamura area using applied geological technique. The length of the debris avalanche scar is
about 250m, and alluvial fan is formed as a debris slope. The ground is composed of weathered granite and
the bottom of the valley was filled by soils derived from disintegrated granite. There are three small
landslides as head scarps with steep slopes at approximately 30°-35°. The debris avalanche was inferred to
have started as a shallow soil slip at the head by rainfall. 3 major causes are inferred which originated the
debris avalanche in the study area; steep slope, ground composed of weathered granite, existence of sandy
soil which occupied at the bottom of valley.
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Keywords | debris avalanche
steep slope
weathered granite
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Publication Title |
Okayama University Earth Science Report
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Published Date | 2013-12-27
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Volume | volume20
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Issue | issue1
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Publisher | 岡山大学理学部地球科学教室
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Publisher Alternative | Department of Earth Sciences, Faculty of Science, Okayama University
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Start Page | 1
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End Page | 6
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ISSN | 1340-7414
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NCID | AN10506284
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Content Type |
Departmental Bulletin Paper
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OAI-PMH Set |
岡山大学
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language |
Japanese
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Copyright Holders | © 2013 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
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File Version | publisher
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Refereed |
False
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NAID | |
Eprints Journal Name | esr
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