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Passage Route Survival and Behavior of Juvenile Salmon at Priest Rapids Dam, Columbia River, WA

机译：华盛顿州哥伦比亚河牧师急流坝少年三文鱼的通行路线生存和行为

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Columbia River hydropower is an economic mainstay of the Pacific Northwest. However, it is well known that the construction of hydropower dams has added anthropogenic pressure to Columbia River salmon populations. Juvenile salmon that pass through powerhouse turbines at large hydropower dams display higher mortality rates than salmon passing through alternative routes; thus at Priest Rapids Dam, a top-spill fish bypass was constructed as a safer alternate downstream passage. To investigate the efficacy of this new passage structure, an acoustic telemetry study was conducted in the spring of 2014 to determine the ability of the bypass to collect and safely pass juvenile steelhead and Chinook salmon. The bypass collected 47% of the monitored steelhead and 38% of the monitored yearling Chinook salmon. Analysis of route choice identified forebay temperature, powerhouse discharge, spillway discharge and forebay approach patterns as significant drivers of passage selection. Immediately following dam passage, steelhead and Chinook salmon that used the bypass had higher survival and migrated faster compared to powerhouse route fish. The Priest Rapids Fish Bypass served its intended purpose by reducing the anthropogenic footprint of this hydroelectric facility on migrating juvenile salmon, which will aid the potential recovery of Columbia River salmon.
机译：哥伦比亚河水电是西北太平洋的经济支柱。但是，众所周知，水力发电大坝的建设给哥伦比亚河鲑鱼种群增加了人为压力。在大型水电站大坝中通过动力涡轮机的鲑鱼的死亡率要高于通过替代途径的鲑鱼。因此，在Priest Rapids大坝上，溢流鱼旁路被修建为更安全的下游替代通道。为了研究这种新型通道结构的功效，2014年春季进行了一次声学遥测研究，以确定旁路收集和安全通过幼体刚头和奇努克鲑鱼的能力。旁路收集了47％的被监视的标头和38％的一岁的奇努克鲑鱼。通过对路线选择的分析，可以确定前湾温度，动力厂房排水，溢洪道排水和前湾进近方式是通道选择的重要驱动因素。大坝通过后，与强壮路线的鱼类相比，使用旁路的硬头head和奇努克鲑鱼具有更高的存活率和迁移速度。牧师急流鱼旁路通过减少该水力发电设施在迁移鲑鱼上的人为足迹而达到了预期目的，这将有助于哥伦比亚河鲑鱼的潜在恢复。

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    Hatch Kyle B;

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