The dynamics of fish stranding have not been academically investigated within the context of physical adjustments to rivers for habitat enhancement purposes. River projects may aim to help fish populations but instead may function as attractive nuisances reducing populations because of unaccounted-for stranding risk. This study applies a novel algorithm to predict spatially explicit, meter-resolution fish stranding risk at a river rehabilitation site in California to address three scientific questions. Postproject disconnected wetted area predictions were validated against water surface elevation measurements and time lapse photography of flow reductions and stranding events. A comparison of preproject, final design, and postproject topographies revealed that the occurrence and severity of stranding events is highly sensitive to side-channel topographic structure and postproject morphodynamic change. Even with moderate flows, side-channel exits tend to close off by bars built across them via bedload transport. Implications for river management practices and river rehabilitation project design are discussed.

中文翻译：

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横向河流连通性和鱼类搁浅风险的自动分析。第 2 部分：幼年奇努克鲑鱼搁浅在河流修复地点

在为改善栖息地目的而对河流进行物理调整的背景下，尚未对鱼类搁浅的动态进行学术研究。河流项目可能旨在帮助鱼类种群，但由于下落不明的搁浅风险，可能会起到减少种群数量的吸引力。本研究应用了一种新颖的算法来预测加利福尼亚河流修复地点的空间明确、米级分辨率的鱼类搁浅风险，以解决三个科学问题。根据水面高程测量值和流量减少和搁浅事件的延时摄影，对项目后断开的润湿面积预测进行了验证。项目前期、最终设计的比较，和项目后地形显示搁浅事件的发生和严重程度对侧通道地形结构和项目后形态动力学变化高度敏感。即使有温和的流量，侧通道出口也往往会被通过床载运输建造的栅栏封闭。讨论了河流管理实践和河流修复项目设计的影响。