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首页> 外文期刊>Journal of the American Water Resources Association >REACH SCALE HYDRAULIC ASSESSMENT OF INSTREAM SALMONID HABITAT RESTORATION
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REACH SCALE HYDRAULIC ASSESSMENT OF INSTREAM SALMONID HABITAT RESTORATION

机译：进行鲑鱼栖息地恢复的大规模水力评估

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摘要

This study investigates the use of a two-dimensional hydrodynamic model (River2D) for an assessment of the effects of instream large woody debris and rock groyne habitat structures. The bathymetry of a study reach (a side channel of the Chilliwack River located in southwestern British Columbia) was surveyed after the installation of 11 instream restoration structures. A digital elevation model was developed and used with a hydrodynamic model to predict local velocity, depth, scour, and habitat characteristics. The channel was resurveyed after the fall high-flow season during which a bankfull event occurred. Pre-flood and post-flood bathymetry pool distributions were compared. Measured scour was compared to predicted shear and pre-flood and post-flood fish habitat indices for coho salmon (Oncorhynchus kisutch) and steelhead trout (O. mykiss) were compared. Two-dimensional flow model velocity and depth predictions compare favorably to measured field values with mean standard errors of 24 percent and 6 percent, respectively, while areas of predicted high shear coincide with the newly formed pool locations. At high flows, the fish habitat index used (weighted usable area) increased by 150 percent to 210 percent. The application of the hydrodynamic model indicated a net habitat benefit from the restoration activities and provides a means of assessing and optimizing planned works.
机译：这项研究调查了使用二维水动力模型（River2D）来评估河道内大块木屑和gro沟生境结构的影响。在安装了11个河道修复结构后，对研究河段（位于不列颠哥伦比亚省西南部的奇利瓦克河的一条河道）进行了测深。开发了一种数字高程模型，并将其与水动力模型一起用于预测局部速度，深度，冲刷和栖息地特征。在秋季发生高流量季节之后，对该渠道进行了重新调查。比较了洪水前和洪水后的测深池分布。将测得的冲刷量与预测的剪切力进行比较，并比较了银大麻哈鱼（Oncorhynchus kisutch）和硬头鳟鱼（O. mykiss）的洪水前和洪水后栖息地指数。二维流动模型的速度和深度预测值与实测值具有良好的比较，平均标准误差分别为24％和6％，而预测的高剪切面积与新形成的水池位置相吻合。高流量时，使用的鱼类栖息地指数（加权可用面积）增加了150％，达到210％。水动力模型的应用表明，恢复活动为栖息地带来了净收益，并为评估和优化计划的工作提供了一种手段。

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