砂防ダム方式渓流取水工について

概要

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This paper is associated with development of a hybrid structure in torrents that serves for streambed water intake as well as debris storage or erosion control dam. Focusing on the intake structure that comprises trashracks(i. e., bar screens) for removal of impurities such as boulders and dead leaves, and sloped deflector or upright stoplog for enhancement of return flow in a water cushion, its hydraulic, properties were experimentally investigated in terms of the quantity of water abstracted from the incoming debris flow. The variable factors considered are length, slope and clearance of the bar, location and height of the deflector, and location of the stoplog. The results show that the flow rate abstracted from the stream depends heavily on the bar slope, and then the slope of 50° is most suitable for preventing the impurities from jamming between the bars. Additionally it is demonstrated that the intake flow rate is more effectively increased by an appropriately located stoplog rather than by the deflector, differing from a conventional sole structure for streambed intake.
日本雨水資源化システム学会の論文