ID 74535
Title Transcription
2004 ネン タイフウ 21 ゴウ ゴウウ ニヨリ カガワケン セイサン チイキ デ ハッセイ シタ シャメン ホウカイ ノ チシツ チケイテキ トクチョウ
Title Alternative
Geological and geomorphological features of slope failures caused by heavy rainfall associated with Typhoon 0421 in Seisan Area, Kagawa Prefecture
Author
Nishiyama, Ken-ichi Laboratory of Geology, Institute of Socio-Arts and Sciences, University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Hirota, Hajime Taiyo Industrial Co., Ltd
Takenaka, Yuta Mitani Sekisan Co., Ltd
Okada, Kenji Japan Meteorological Agency
Keywords
Slope failure
Critical rainfall
Izumi Group
Weathered profile
soil water index
Content Type
Departmental Bulletin Paper
Description
Many slope failures and debris flows triggered by heavy rainfall associated with Typhoon 0421 occurred in Seisan area, Kagawa Prefecture, Japan. Critical rainfall to trigger the slope failure is 65mm/h, 150mm/3h, total precipitation 250mm, and soil water index 180. Many slope failures occurred at side-slope and/or debris filled floor of 1-order valley in mountain slopes consisting of alternating beds of sandstone and mudstone (Izumi Group). Field evidence suggests that rainwater penetrated into permeable weathered sandstone layer lying on poor permeable mudstone layer. Many slope failures occurred at weathered sandstone layer because of low strength and a rise in the groundwater level. The occurrences of slope failures were controlled by weathered profile of alternating beds of sandstone and mudstone.
Journal Title
徳島大学総合科学部自然科学研究 = Natural Science Research, The University of Tokushima
ISSN
09146385
NCID
AN10065859
Volume
24
Issue
4
Start Page
75
End Page
85
Sort Key
75
Published Date
2010
EDB ID
FullText File
language
jpn
departments
Science and Technology