A Study On Debris Flow Disasters Along Japanese Railways And Its Critical Rainfalls

Abstract

In the year 2004 in Japan, a huge number of disasters occurred due to heavy rainfalls during annual rainy seasons, and typhoons hit in Japan more than ever. An area on the Yosan line in Shikoku Japan Railway suffered especially from serious slope failures after being hit four times by Typhoons. In this paper, we introduce an example of the debris flow that took place in the area; and clarify the causes of such disasters in view of the geological and geographical features of the area. It also shows that an evaluation of the critical rainfalls, which caused debris flow with an analysis of rainfalls observed at that time.