山口県防府市における土石流発生域の地形・地質的特性と過去の土石流・崩壊発生サイクル(<特集>近年における斜面災害)

概要

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Hofu area has dissected landforms of weathered Hiroshima-type granite bedrock and gentle stream beds in gradient. During the heavy rainfall period in July 2009 many slope failures and debris flows occurred. Unstable debris are located on slopes and stream beds, where debris flow cones progressively formed due to past debris flows. In Tsurugi River the biggest sediment movement occurred in the 2009 disaster allowed to understand that debris flows of similar magnitude occurred more than three times in the past. This is based on the micro-topographic analysis done using detailed topographic map and field survey. It is important to examine possibility of sediment disaster and its occurrence cycle in order to prevent disasters in the future. Micro topographic analysis using detailed topographic map, historical documents research and interpretation are effective tools to inspect the history of past disasters in a particular area.
社団法人地盤工学会の論文
2013-09-01