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The Hydraulic Design of The Dalles 8/9 Spillwall

机译：Dalles 8/9溢洪道的水力设计

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The spillway is the primary downstream migrant juvenile salmon passage route past The Dallesrndam. To improve juvenile fish passage survival through The Dalles spillway, the pier betweenrnSpillbays 8 and 9 will be extended approx imately 800 feet downstream (8/9 Spillwall). This willrncreate a safe conveyance channel for juvenile salmon to pass from the forebay basin and shelfrnto the main channel thalweg downstream of the dam. Biological studies suggest that thernprimary cause of low survival at The Dalles is predation, and significant percentages of juvenilernfish passing over the spillway end up in predator prone regions.rnThe location of the spillwall was determined in a 1:80 general physical model where dye wasrnused to evaluate downstream juvenile egress conditions. Hydraulic loads on the wall wererncomputed using the form drag equation and data collected from a 1:36 sectional model usedrnduring the original dam design effort in the 1950s. As a secondary check, momentum analysesrnwere also applied. The hydraulic loads were ultimately checked using a Computational FluidrnDynamics (CFD) model of the spillwall. The hydraulic loads from the CFD model were slightlyrnless than those computed using the form drag equation.rnThe methodology used to locate the spillwall and compute the hydraulic loads will be presentedrnand will include the comparison between the hydraulic loads.
机译：溢洪道是经过达勒斯丹大坝的主要下游移民少年鲑鱼通过路线。为了提高通过Dalles溢洪道的幼鱼通过的存活率，rnSpillbays 8和9之间的码头将向下游延伸约800英尺（8/9 Spillwall）。这将为幼鲑从前湾盆地和架子到大坝下游的主要海藻通道建立一个安全的输送通道。生物学研究表明，达勒斯郡低存活率的主要原因是捕食，并且相当大比例的幼鱼通过溢洪道最终位于掠食者易发地区.rn溢洪道的位置是在1:80的一般物理模型中确定的，其中染料被染成评估下游青少年的出口状况。使用形式阻力方程来计算墙体上的水力载荷，并从1950年代最初的大坝设计工作中使用的1:36截面模型收集数据。作为辅助检查，还应用了动量分析。最终使用溢流墙的计算流体动力学（CFD）模型检查了液压负载。 CFD模型中的液压载荷比使用形式阻力方程计算的液压载荷略小。将介绍用于定位溢洪墙和计算液压载荷的方法，并将包括液压载荷之间的比较。

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