Journal of the Japan Society of Erosion Control Engineering, Vol.59,No.5,2007
Research on sediment yield and sediment discharge which considers timing
of sediment yield
Toshihiro HASHINOKI Takahisa MIZUYAMA Kazuyuki SATOH Masato MURAKAMI
Abstract
A large]scale sediment]related disaster was occurred in the Hime River drainage
area in July, 1995. To understand the timing of this sediment movement, the hearing
to the person in charge of the local disaster prevention was investigated. As
a result, it was occurred the timing of the sediment yield had concentrated around
18 o'clock July 11 in each tributary. But only Nakaya River was occurred the sediment
yield in the early morning, July 12. Moreover, the scouring Tsukitsuki gate at
the main river was 16:00]17:00 of the 11th before the sediment yield of each tributary
concentrated, the cause of damage to the building in the vicinity at Hime River
spa is due to the sedimentation, and no water discharge increase. The reproduction
calculation considered the timing of sediment yield. As a result, the streambed
from the No.8 Shita]himekawa bridge point to Ohdokoro River rose in the maximum
by about 10m, and was corresponding to an almost actual phenomenon. As for the
variation of riverbed, it has been understood that not only the sediment discharge
but also the timing of the sediment yield is greatly related from the tributary.
Key words:hearing investigation, timing of sediment movement, Hime River
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