Journal of the Japan Society of Erosion Control Engineering, Vol.59,No.3,2006
Study on new type slit sabo dam development for reduction of slit blockade
by drift woods
Masahiro KATATANI Takashi YAMADA
Abstract
In these years, they construct many sediment discharge control dam (slit sabo
dams) in Hokkaido, but cases drift woods blockade slits of the dams during floods
within the scope of the sabo plan are be confirmed. To reduce this troubles, we
need devices to prevent drift woods from blockading slits with dams itself, and
structures trapping drift woods. In this study, we devised new type dams based
on the actual conditions of slits blockade by drift woods. And we estimated the
function through hydraulic model tests, achieved mentioned below conclusions.
1) We can obtain the equivalent effect of sediment control of an usual slit dam,
with the new type dam whose lower about fifth of slit width was doubled and other
higher slit width was reduced to half.
2) We can reduce slit blockades by drift woods with the new type dam when the
water level is over the top of wider slits. Because drift woods sink and flow
downstream through the wider slit. We need the wider slit is over drift woods
to prevent blockading slits for certain.
Key words:Slit blockade by Drift wood, Convexity]shaped slit dam, Hydraulic model
test, Sediment discharge control, Drift wood discharge
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