Journal of the Japan Society of Erosion Control Engineering, Vol.56,No.6,2004

Debris flows triggered by the 10th Typhoon recurred on August 8th2003 in Fujiwara Town, Mie Prefecture

Shinya NUMAMOTO, Kanji KONDO, Setsuo HAYASHI, Toshihiko NISHIMOTO, Sokichi MAEGAWA

Abstract

Debris flows recurred on August 8th 2003 in Fujiwara town, Mie prefecture where debris flows have occurred in2002 since occurring in 1999. The debris flows occurring at Nishinogaito stream and Kotaki‐stream, were trigged by the 10th typhoon which caused total rainfall 333mm, maximum hourly rainfall 43mm and maximum 10‐minute rainfall 19mm. The debris flows may occur when the maximum 10‐minute rainfall was recorded because of response of debris flow sensors. By the field survey, it is revealed that sediment deposition at uppermost gravel sediment zone was eroded, and accumulated as results of the behavior of flow at midstream. At Nishinogaito stream, especially, an unstable sediment deposition still remains.

Key words:debris flow, recurrence, typhoon, heavy rainfall, Fujiwara town

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