Laboratory study on behavioral responses of hybrid sturgeon, Acipenseridae, to wake flows induced by cylindrical bluff bodies
Laboratory study on behavioral responses of hybrid sturgeon, Acipenseridae, to wake flows induced by cylindrical bluff bodies
复制标题
杂交鲟对圆柱形钝体尾流行为反应的实验室研究
DOI：
10.1016/j.scitotenv.2021.149403
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发表时间：
2021
影响因子：
9.8
通讯作者：
Chen Xiaoqi
中科院分区：
文献类型：
--
作者：
Zha Wei;Zeng Yuhong;Katul Gabriel;Li Qian;Liu Xiaoguang;Chen Xiaoqi
流动与圆柱状结构的相互作用产生了鱼类在自然环境中经常经历的相干和周期性湍流，影响了鱼类的机动和游泳稳定性。本研究评估了杂交鲟（Acipenser dabryanus♀×Acipenser baerii♂）与直径2 ~ 6 cm的d形圆柱体诱导的尾流相互作用时的行为反应。采用二维粒子图像测速仪（PIV）测量了d形圆柱体诱导的尾流流体动力学，并通过相机记录了鱼的行为。分析了水动力空间占用和游动行为，结果表明，由于存在最低速度和相对较低的湍流，圆柱体后区域具有鱼类首选站持区特征。鲟鱼采用独特的游泳步态（Kármán gaiting或spill），以响应圆柱体尾流和相关的鱼类游泳运动学彼此不同。Kármán捕鱼和溢出显著依赖于速度、涡量和雷诺剪应力，并随湍流长度尺度与标准鱼长（Lu/Lfish）之比的变化而变化，这凸显了圆柱涡结构对鱼保持站和游泳稳定性的重要性。预计这些结果可以为鱼类在自然栖息地中可能喜欢占据的位置提供见解，并为鱼类友好型项目的设计和优化提供建议。
Interaction between flow and cylindrical-shaped structures generates coherent and periodic turbulent flow that is frequently experienced by fish in natural environments, influencing fish maneuvering and swimming stability. The current study evaluated the behavioral responses of hybrid sturgeon (Acipenser dabryanus♀ ×Acipenser baerii♂) when interacting with the wake flows induced by a D-shaped cylinder, with diameter ranging from 2 to 6 cm. A two dimensional Particle Image Velocimetry (PIV) was used to measure the wake flows hydrodynamics induced by D-shaped cylinders, and the fish behavior was recorded by camera. Hydrodynamic space occupancy together with swimming behaviors were analyzed, and the result shows that due to the presence of lowest velocity and relatively low turbulence, the regions behind cylinder were characterized by the preferred station holding zone for fish. Sturgeon adopted distinctive swimming gaits (Kármán gaiting or spill) in response to the cylinder wake flow and the associated fish swimming kinematics differed from each other. Kármán gaiting and spill significantly depended on velocity, vorticity and Reynolds shear stress, and varied according to the ratio of turbulence length scale to standard fish length (Lu/Lfish), which highlights the importance of cylinder vortex structure in influencing fish holding station and swimming stability. It is envisioned that these results can provide insights into the positions where fish may prefer to occupy in natural habitats and recommendations for the design and optimization of fish-friendly projects.