土石流の発生に関わる渓床堆積物と降雨条件についての検討

概要

論文の詳細を見る
The occurrence of debris flow is generally known to be caused by the heavy rainfall. However, there is a possibility that prime factors, such as the debris deposits in the channel, also influence the occurrence of debris flow. The aim of this paper is to evaluate the influence of the prime factors on the rainfall threshold. In 1998, debris flow observation system was installed in Ichinosawa upper catchment of Ohya collapse, the initiation area of debris flow. Field researches show that the occurrence of debris flows cause changes in the quality and the quantity of debris deposits and the rain-runoff process of the catchment. Rainfall threshold were estimated by threat score. There was no significant difference between the threshold before and after the first debris flow of the year. Threat score can be useful to evaluate the influence of the prime factors.
日本自然災害学会の論文
2004-05-30