Shigeo HORIUCHI, Shigekiyo TABATA, Shingo ONO, Takahiro ITOH and Takahisa MIZUYAMA
Abstract
In Japan, many of the recent sabo dam constructions have been of the open]type
in consideration of the continuity of sediment routing from upstream to downstream
reach in a river basin. A lot of experimental and numerical research has been
conducted on sediment control using concrete slit dam, slit dam with steel grids
and so on. However, there are a few researches which discuss sediment runoff
and its control near upper parts of the grids, while channel shifting and bars
movements can be active due to deposition after huge volume of sediment is captured
in the storage area of sabo dam.
In the present study, the sediment control function of the ggrid]type sabo high
dam (GHD)", which is defined as a grid]type sabo dam with a height over
15 m, was examined preliminarily using experimental data sets such as dimensionless
sediment runoff volume passing through the check dam. Flume experiments for
sediment control using a kind of gsteel wire]nets" near the vertically
upper parts of the grid were conducted focusing on the simple and the effective
countermeasures for the sediment storage in a sabo dam, and sediment control
in present easy way, in which steel wire nets could be flexible and removable,
was confirmed.
Key wordsFgrid]type check dam, steel nets, debris flow, flume experiment