A Study On Debris Flow Disasters Along
Japanese Railways And Its Critical Rainfalls
Author(s)
S. Watanabe, T. Sugiyama, O. Nunokawa, T. Fujii, K. Okada
& H. Mitsunaka
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.
Keywords: debris flow, maximum hourly rainfall, continuous rainfall, critical
rainfall.
1 Introduction
In Japan, most railways suffered from severe natural environments such as heavy
rainfalls due to typhoons and annual rainy season causing slope failures. In order
to secure safe train operations during such heavy rainfalls, the railways have
imposed strict operational restrictions to prevent presumable accidents. Despite a
large number of natural disasters occurred in the past, grave accidents i.e.
derailments and vehicle overturning have scarcely occurred by appropriate
operational restrictions.
In the year of 2004 in Japan, heavy rainfalls due to annual rainy season and
typhoons caused a huge number of disasters. Especially, the area on Yosan line
under jurisdiction of Shikoku Japan Railway Company suffered from serious
slope failures four times due to Typhoons.
Keywords
debris flow, maximum hourly rainfall, continuous rainfall, critical
rainfall.
Related Book
Other papers in this volume
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