Hydraulic design aspects of rock-weir fishways with notch for habitat connectivity

IF 4.6 Q2 ENVIRONMENTAL SCIENCES
A. Baki, D. Zhu, A. Harwood, A. Lewis, Katie Healey
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引用次数: 9

Abstract

Abstract Nature-like fishways have been installed at many migration barriers in recent years to mitigate the effects of human development and habitat fragmentation on fish. The design of these fishways determines the flow characteristics and ultimately the success of these passage facilities. This study numerically investigates the hydraulic properties associated with small passage openings (notch) that are provided in rock-weir-type fishways. Two distinct flow regimes, weir and transitional, were identified. The rock-weir with notch ensured suitable hydraulics for fish migration and sufficient fish resting areas in weir pools. A dimensionless weir coefficient was introduced to existing depth–discharge relationships to compute the weir flow more accurately. A reduction factor for the maximum velocity was also proposed as a function of discharge. This study optimized the design of rock-weir fishways considering passage notches based on fish resting zones, volumetric dissipated power, and performance for upstream fish migration.
带槽口的岩堰鱼道的水力设计
近年来,为了减轻人类发展和栖息地破碎化对鱼类的影响,在许多洄游屏障上设置了类似自然的鱼道。这些鱼道的设计决定了这些通道设施的流动特性,并最终决定了这些通道设施的成功。本研究用数值方法研究了岩石堰型鱼道中与小通道开口(缺口)相关的水力特性。确定了两种不同的流动形式,堰式和过渡式。带缺口的岩堰确保了适合鱼类洄游的水力和堰池中足够的鱼类休息区域。在已有的深度-流量关系中引入无因次堰系数,以便更准确地计算堰流量。提出了最大流速的折减系数作为流量的函数。基于鱼类休止区、体积耗散功率和上游鱼类洄游性能,优化了岩堰鱼道的通道缺口设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
7.10
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