Journal of the Japan Society of Erosion Control Engineering, Vol.57,No.4,,2004

Sediment related disasters caused by typhoon Meari (T0421) in Miyagawa village, Mie prefecture on September 29, 2004 (prompt report)

Setsuo HAYASHI, Satoshi TSUCHIYA, Kanji KONDO, Hirofumi SHIBANO, Shinya NUMAMOTO, Ken'ichirou KOSUGI, Takao YAMAKOSHI, Akihiko IKEDA

Abstract

Several slope failures and debris flows occurred on September 29, 2004 in Miyagawa village, Mie prefecture. The geological background around Miyagawa village consists of metamorphic rocks of Sambagawa belt and sedimentary rocks of Chichibu belt, and the bedrocks near the surface were strongly weathered. The heavy rainfalls caused by the typhoon Meari (T0421) triggered these sediment disasters. Cumulative rainfalls at several rain gauges in Miyagawa village were about 600-700mm, and hourly rainfalls were about 100-125mm/h around 8:00 to 10:00 a.m. Cumulative rainfall in Miyama town located at southern side of Miyagawa village exceeded 1,000mm and the maximum hourly rainfall reached to 150mm/h (8:00-9:00a.m.). Therefore, many slope failures and debris flows occurred from 8:00 to 12:00 a.m. As a result of these heavy rainfalls, six deaths and one missing person were recorded and 44 houses or sheds were completely broken or lost.

Key words:typhoon Meari, sediment related disasters, slope failure, debris flow, Miyagawa village

Japan Society of Erosion Control Engineering
Sabo Kaikan, 2-7-5 Hirakawa-cho, Chiyoda-ku,
Phone +81-3-3222-0747 Fax +81-3-3230-6759
http://www.jsece.or.jp/
Mail jimu@jsece.or.jp