GEOGRAPHICAL SCIENCES
Online ISSN : 2432-096X
Print ISSN : 0286-4886
ISSN-L : 0286-4886
On Evaluation of Outbreakability of Debris Flow by means of a Matrix Approach : A Case Study on 1967 Hazerd in Kure City
Kazunari MAKINO
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1982 Volume 37 Issue 3 Pages 157-164

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Abstract

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.

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この記事はクリエイティブ・コモンズ [表示 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by/4.0/deed.ja
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