昭和 58 年 7 月山陰豪雨による山口県下の河川災害と土石流災害の調査研究

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This paper reports the properties of flood and debris flow disasters in northern Yamaguchi Prefecture caused by a storm of the Showa 58.7 San-in Goou. The disasters concentrated on Tamagawa and Susa regions. The concentration reflected a localized heavy rain in these areas. Most of the Flood disasters occurred in small sized rivers and branches of about 2∿5km length. The slope of the river bed at which the disasters occurred is no more than about 0.05. A debris flow of Kouyamagawa suggests a prevention measure of this disaster. After the debris flow broke a bank of a bending point and flowed down a protected low-land, it flowed into a reservoir located immediately downward from the broken point. The debris flow loosed its energy by deposition of sediment in the resevoir. The disaster at the area located downward, therefore, was greatly reduced.
山口大学の論文