FLOWING-DOWN PROMOTING DAM STRUCTURE AND FLOWING-DOWN PROMOTING METHOD OF DEPOSIT SEDIMENT IN DAM WATER RESERVOIR

摘要

PROBLEM TO BE SOLVED: To solve the problems of increasing cost since there are many in points difficult to carry out sediment by geographical conditions of a dam site, the road conditions, or the like, when recovering and discharging the sediment deposited in a dam water reservoir by dredging; and hindering the dam water reservoir function, for requiring many days for recovering a water level, when trying to flow down by tractive force by lowering the water level.;SOLUTION: A pair of dam means 22 are arranged in a sediment deposit area B in the dam water reservoir 2 for gathering flowing water to the central part side of a river channel by narrowing the flow passage cross-sectional area of the river channel of the water reservoir 2. The pair of dam means 22 are arranged at a prescribed interval on both sides of a river channel central part, and are arranged in large numbers at a proper interval along the river channel central part. The flowing water at river water increasing time being high in an inflow speed into the water reservoir, is used so as not to reduce the speed by the dam means 22. The sediment deposited in an upstream part in the water reservoir 2 is made to flow down up to a dischargeable area from a sand removal gate 8 of a dam bank body 6 without lowering the water level.;COPYRIGHT: (C)2005,JPO&NCIPI