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首页> 外文期刊>River Research and Applications >PASSAGE EFFICIENCY OF OFFSET AND STRAIGHT ORIFICES FOR UPSTREAM MOVEMENTS OF IBERIAN BARBEL IN A POOL-TYPE FISHWAY
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PASSAGE EFFICIENCY OF OFFSET AND STRAIGHT ORIFICES FOR UPSTREAM MOVEMENTS OF IBERIAN BARBEL IN A POOL-TYPE FISHWAY

机译：池式鱼道中伊比利亚扁豆上游运动的偏移和直线运动的通行效率

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摘要

Although coarse fish species are frequently the predominant taxa found in rivers, they are often neglected in fish passage studies. Detailed knowledge on the impact of hydraulics on the movements and swimming performance of these species is very limited. In this study, offset and straight orifices in a pool-type fishway prototype were tested in terms of their suitability for Iberian barbel's (Luciobarbus bocagei) upstream movements. The effects of water velocity and turbulence descriptors on fish swimming performance were herein also analysed. Overall, the offset configuration was found to have a significantly higher rate of fish passage success (68%) than the straight arrangement (28%). The time taken to successfully negotiate the fishway was also significantly lower when it featured an offset configuration, particularly for small adults. Of all analysed hydraulic parameters, Reynolds shear stress (RSS) seemed to be the one that most strongly influenced the movements of Iberian barbel within the fishway. The findings provide evidence that the barbel's swimming performance and capacity to successfully migrate upstream through a fishway strongly depend on the arrangement of orifices and turbulence, in particular RSS, within a fish pass. More detailed research focusing on other 'weak' swimmers is recommended to improve future designs of pool-type fishways suitable for other coarse species.
机译：尽管粗鱼类通常是河流中发现的主要分类单元，但在鱼类通过研究中却经常被忽略。关于水力对这些种类的运动和游泳性能的影响的详细知识非常有限。在这项研究中，对池型鱼道原型中的偏置孔和直孔进行了测试，以证明它们适合伊比利亚通天河上游运动。本文还分析了水速和湍流描述符对鱼游泳性能的影响。总体而言，发现偏移配置的鱼通过成功率（68％）比直线排列（28％）高得多。采用偏心配置时，成功协商鱼道所需的时间也大大减少，特别是对于成年成年鱼。在所有分析的水力参数中，雷诺剪切应力（RSS）似乎是最影响伊比利亚通向鱼道内运动的一种。这些发现提供了证据，表明通天的游泳性能和成功通过鱼道向上游迁移的能力在很大程度上取决于鱼道内孔口和湍流的布置，特别是RSS。建议对其他“弱”型游泳者进行更详细的研究，以改进将来适用于其他粗物种的池型鱼道的设计。

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