マトリックス・アプローチによる崩壊・土石流発生危険度判定の試み : 呉市1967年7月災害を事例として
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概要
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This paper aims to clarify the land conditions under which debris flow and land slip are likely to occur due to heavy rainfall. Kure city which has been repeatedly damaged by debris flow is selected as a study area. The present writer used the Matrix Approach proposed by DeGraff and Romesburg (1980). In this method, the study area is divided into homogeneous units regions according to various combination among geology, slope inclination and slope direction. Then the relation between the occurrence of debris flows in 1967, and the homogenious units regions are examined. As a result, in Yasumiyama mountain, the region with high outbreakability lies in 1) area of coarse granite area in comparison with dike area, and 2) slope inclination between 20 and 40 degree. Homogeneous units regions with high occurrence rate is naturally considered to be dangerous regions against debris flow in future.