Journal of the Japan Society of Erosion Control Engineering
Online ISSN : 2187-4654
Print ISSN : 0286-8385
ISSN-L : 0286-8385
Sediment-related disasters in Kisawa-Village and Kaminaka-Town in Tokushima Prefecture, Japan, induced by the heavy rainfall of the Typhoon Namtheun in 2004 (prompt report)
Hiromasa HIURAMasahiro KAIBORIAkira SUEMINEYoshifumi SATOFUKADaizo TSUTSUMI
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2004 Volume 57 Issue 4 Pages 39-47_1

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Abstract

From the end of July to August 2, 2004, the 10th Typhoon (called Namtheun) has damaged to the area around Kisawa Village and Kaminaka Town in Tokushima Prefecture, Japan. There were geologically sediment rocks and a lot of faults in these areas. Especially, on August 1, 2004, it brought extraordinarily heavy rainfall more than 1, 114mm of the daily rainfall-record in Japan onto these areas and a lot of slope failures and debris flows occurred. In the Shiraishi area, in Kaminaka Town, as many residents have paid attention to the occurrence of abnormal phenomena and most of them have opportunely evacuated, no lives were lost by debris flows. In the Azue area, in Kisawa-Village, the tendency of expansion of the landslide area was recognized. The areas, where large-scale debris flows and slope failures occurred, coincided with the areas, where both of a large quantity of cumulative rainfall and large rainfall intensity were brought. However, the critical values of rainfall, which had been related to the occurrence of sedimentrelated disaster, were two to four times greater than those in the cases of granite area in Hiroshima district in Japan.

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