研究ノート
土砂災害に関する大雨の豪雨度と崩壊個数の関係
キーワード:
evaluation of heavy rainfall,
amount of heavy rainfall,
local rainfall,
antecedent rainfall,
triggering rainfall
2019 年 72 巻 4 号 p. 15-20
詳細
2019 年 72 巻 4 号 p. 15-20
We previously proposed the degree of rainfall (H) as an indicator to evaluate heavy rainfall that causes sediment-related disasters. This indicator was introduced by using two factors for local rainfall : antecedent rainfall and triggering rainfall. Although the proposed degree of heavy rainfall (H) is useful to classify and evaluate extreme torrential rainfall in various places, the effectiveness as a factor to determine sediment-related disasters has yet to be evaluated. To clarify this relationship, we examined the relationship between the number of slope failure occurrence areas (n) and the degree of rainfall (H) for major heavy rain by year in Kure City from 1951 to 1972. There is a strong relationship (n=aHb, a=3.39, b=4.3 coefficient of determination : R2=0.94), suggesting that slope failure strongly depends on the degree of heavy rainfall (H). Consequently, the degree of heavy rainfall (H) is a useful indicator to evaluate and analyze heavy rainfall causing sediment-related disasters.
