Journal of the Japan Society of Erosion Control Engineering, Vol.59,No.6,2007
Reproduction of the flood that occurred by outburst of Takaiso]yama landslide
dam
Yoshifumi SATOFUKA, Kousuke YOSHINO, Kiichiro OGAWA, Toshio MORI,
Takahisa MIZUYAMA and Junichiro TAKAHAMA
Abstract
It is necessary to estimate immediately a flood hydrograph, peak discharge in
particular for appropriate preparedness downstream when landslide dams are formed.
Some studies have been carried out, however they were seldom applied to real landslide
dam outbreaks because there aren't field data to be compared. The flood mark data
of Takaiso]yama Landslide dam outbreak happened in 1892 was found and analyzed
recently. A flood hydrograph estimation method based on erosion and sediment transport
equations developed for debris flow was applied to the flood. Flood depth was
well explained, estimated flow velocity was larger than reported values though.
The winding channel may be a reason of the disagreement.
Key words:landslide dam, outbreak, Takaiso]yama, erosion, sediment transport,
debris flow, simulation
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