Author(s): Qi Zhang; Jiayue Shi; Weiyang Zhao; Juping Huang; Shanlin Xu

Linked Author(s): Qi Zhang, Weiyang Zhao, Juping Huang

Keywords: Fish migration; Euler-Lagrange coupled; Vertical slot fishway; OpenFOAM; Agent-based

Abstract: The migration of fish is widely disturbed and even blocked by hydraulic buildings. To minimize the disturbance of hydraulic buildings on fish migration, fish passage facilities are built along the river and operated on-demand, providing an alternative way for migratory fish. However, the influential factors of fish movement are still unclear, which leads to difficulties in designing the functional artificial fish passage facilities. In this work, a two-way coupled Euler-Lagrange coupled approach is employed to simulate the fish movement in a vertical slot fishway. The drag force and the motive force by fish itself are both modeled based on the literatures. And the model parameters are calibrated with the swimming performance test of Asian carp. The simulated fish trajectory in a vertical-slot fishway (VSF) has many characteristics in agreement with the experimental results, e.g., the trajectory is partially random due to turbulent vortices shedding, and the fish tend to rest behind the vertical baffle and spend the most time there. The results also show that the maximum velocity is the single most important hydrodynamic factor that determines the success rate of upstream migration. The simulation method proposed in this work gave an insight as to how fish moved in artificial turbulence flow and act as a predictive tool of the fishway design and operation.

DOI: https://doi.org/10.3850/IAHR-39WC252171192022630

Year: 2022