Journal of the Japan Society of Erosion Control Engineering, Vol.58,No.4,2005
Sediment disasters caused by typhoon Nabi (T0514) in September, 2005
Yoshinobu TANIGUCHI Taro UCHIDA Hiroshi OMURA Hirotaka OCHIAI
Masahiro KAIBORI Tetsuya KUBOTA Katsuo SASAHARA Takashi JITOUSONO
Osamu SHIMIZU Etsuro SHIMOKAWA Hideki TERADA Yukiyoshi TERAMOTO
Hiromasa HIURA Shinya YOSHIDA
Abstract
Typhoon Nabi (No.14) which hit Japan in September, 2005 exposed her to danger
for many hours. The maximum hourly rainfall was not so great, but continuous rainfall
during 72 hours was over 500mm in each area where suffered from severe damages.
This typhoon caused incidences of 116 debris flows, 185 slope failures, 30 landslides.
On account of that, 19 people were killed in Kagoshima, Miyazaki and Yamaguchi
Prefecture, 3 people were missed in Oita Prefecture, 79 houses were destroyed
completely and 21 houses were partially destroyed in Japan. Especially, severe
damages were caused in Kyushu Region by greatly high continuous rainfall of this
typhoon. Besides this region, 10 debris flows and a landslide occurred in Chugoku
Region (509mm of the maximum continuous rainfall, Yamaguchi Prefecture), and 29
slope failures, 7 debris flows and 3 landslides occurred in Shikoku Region (1203mm
of the maximum continuous rainfall, Tokushima Prefecture). To mention another
feature of disasters by Typhoon Nabi, many large scales of landslides occurred
in Miyazaki Prefecture. Especially a greatly large scale of landslide occurred
on Mt. Wanituka in Tano Town. The total amount is estimated 5.61x106 m3 as collapsed
soil, residual soil is estimated 3.52x106 m3, sediment deposition is estimated
1.08x106 m3.
Key words:Typhoon Nabi, Sediment disaster, slope failure, debris flow, landslide
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