Flow Structure of Open-channel Flow with a Backward-Facing Step with a Slope

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  • 斜め段落ち部を有する開水路流れの構造
  • ナナメ ダンオチ ブ オ ユウスル カイスイロ ナガレ ノ コウゾウ

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Abstract

At the location where a backward-facing step or, in the river engineering sense, a drop structure is installed in an open-channel, flow separates and generates a relatively large recirculating region while actively shedding separation vortices in the downstream direction. The shedding of the vortices can be reduced by installing a mild slope at the downstream side of the step, by which the downstream and the upstream flows are more smoothly connected with less energy loss at the step. It is also advantageous for fish to run upstream through the structure when the streamlines are smooth. In this study, the flow at the step with various slope angles are examined experimentally by using the image analysis method with a high speed video camera. It was made clear that a characteristic vortex structure affecting the water surface configuration is generated for a mild slope condition.

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