Journal of the Japan Society of Erosion Control Engineering, Vol.59,No.1,2006
Experimental study of process and outflow rate when landslide dams outburst
Akira ODA Takahisa MIZUYAMA Yuji HASEGAWA Toshio MORI Koushin KAWADA
Abstract
The processes of outbursts of a landslide dam, consisting of sand, and a mixture
of sand and bentonite were observed through flume experiments. The discharge rate
of the outflow overflowing the top of the dam was measured. As a result, it was
observed that there were a number of peaks appearing in the flow discharge hydrograph
during the outbursts. The maximum discharge rate was observed at its first peak
when the vertical erosion rate was most intensive. The value was then in a range
from a few to a few tens times the inflow rate. These peak flow discharge rates
were evaluated through the equation of Tabata et al. The second and the following
peaks were caused by horizontal erosion in the eroded channel. Further, we also
found that the temporal variations of the outbursts on the landslide dam were
affected greatly by the adhesive qualities of the landslide dam earth.
Key words: landslide dam, outburst, outflow rate, experiment
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