首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Sensitivity of the downward to sweeping velocity ratio to the bypass flow percentage along a guide wall for downstream fish passage
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Sensitivity of the downward to sweeping velocity ratio to the bypass flow percentage along a guide wall for downstream fish passage

机译:向下游鱼通道沿着导墙向下扫描速度比对扫描速度的敏感性

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摘要

Partial-depth impermeable guidance structures (or guide walls) are used as a method to assist in the downstream passage of fish at a hydroelectric facility. However, guide walls can result in a strong downward velocity causing the approaching fish to pass below the wall and into the direction of the turbine intakes. The objective of this study was to describe how the ratio of the vertical velocity to the sweeping velocity magnitude changes along the full length and depth of a guide wall under a wide range of bypass flow percentages within a power canal. This paper focused on two guide wall configurations, each set at an angle of 45 degrees to the approaching flow field and at a depth of 10 and 20 ft (3.05 and 6.10 m). The hydraulic conditions upstream of each guide wall configuration were shown to be impacted by a change in the bypass flow percentage, not only near the bypass but also at upstream sections of the guide wall. Furthermore, the effect of changing the bypass flow percentage was similar for both guide wall depths. In both cases, the effect of increasing the bypass flow percentage was magnified closer to the bypass and deeper in the water column along the guide wall.
机译:部分深度不可渗透的引导结构(或引导壁)用作有助于在水力发电机械的下游通道的方法。然而,引导壁可以产生强烈的向下速度,导致接近的鱼在墙壁下方通过并进入涡轮机进口的方向。本研究的目的是描述垂直速度与扫描速度幅度的比率沿着引导壁的全长和深度在动力运河内的各种旁路流量百分比下变化。本文集中在两个引导墙体配置上,每个纸张均以45度的角度设定为接近流场,深度为10和20英尺(3.05和6.10米)。显示每个导向墙体配置上游的液压条件被旁通流量百分比的变化影响,不仅在旁路附近而且也是在引导壁的上游部分附近。此外,对于两个引导墙深度相似,改变旁通流量百分比的效果。在这两种情况下,增加旁通流量百分比的效果沿着导向墙更靠近旁路和深度的旁路。

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