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A Novel Approach to Fish Behavior Evaluation Using Split-beam Hydroacoustic Techniques

机译：裂束水声技术评价鱼类行为的新方法

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The Walla Walla District Corps of Engineers installed and began testing a prototype surface bypass and collector (SBC) at Lower Granite Dam (LGR) on the Snake River, Washington, in spring 1996. The purpose of the SBC was to provide surface flow to attract migrating juvenile salmon and bypass the project turbines. In this study, we deployed split-beam hydroacoustic equipment to evaluate true fine-scale behavior (a component of observed movement) of the juvenile salmonids as they approached the SBC structure and associated flow net. Results indicate that there were slight differences between the SBC configurations in the YZ plane (vertical/horizontal normal to the SBC). Fish behavior with flow effects removed was positively rheotactic, with movement up and toward the forebay. The actual or apparent fish movement was slightly up and toward the dam. This novel approach to split-beam hydroacoustics may be applied at any structure to evaluate fine-scale fish velocity components relative to flow or other stimuli affecting fish behavior.
机译：沃拉沃拉地区工程师团于1996年春季在华盛顿州蛇河的下花岗岩坝（LGR）上安装并开始测试原型地表旁路和集水器（SBC）。SBC的目的是提供地表水以吸引迁移幼鲑并绕过项目涡轮机。在这项研究中，我们部署了分束水声设备来评估少年鲑鱼接近SBC结构和相关流网时的真实细尺度行为（观察到的运动的一部分）。结果表明，YZ平面中的SBC构型之间存在细微差异（垂直/水平法向于SBC）。去除流动效应后的鱼类行为是积极的风向标，向上和向前湾移动。实际或明显的鱼类运动略微向上并向水坝移动。这种用于分离束水声的新颖方法可以应用于任何结构，以评估相对于水流或影响鱼类行为的其他刺激的细尺度鱼类速度分量。

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