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Innovative configuration of vertical slot fishway to enhance fish swimming conditions

Journal of Hydrodynamics 2022年第5期34卷 917-933页

作者： Mohammad Ahmadi Alban Kuriqi Hossein Mohammad Nezhad Amir Ghaderi mirali mohammadi Department of Civil Engineering Faculty of EngineeringShabestar BranchIslamic Azad UniversityShabestarIran CERIS Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal Civil Engineering Department University for Business and TechnologyPristinaKosovo Department of Civil Engineering Faculty of EngineeringUrmia UniversityUrmiaIran Department of Civil Engineering Faculty of EngineeringUniversity of ZanjanZanjanIran

A vertical slot fishway(VSF)is among the most effective and commonly used fishway structures to enable fish to pass through artificial barriers such as dams and weirs in the ***,such structures need further improvements in providing better swimming conditions for fish inside the pool and enhancing attraction at the ***,the main objective of this study was to investigate the influence of slope and whether integrating some cylinder structures inside the fishway could enhance further attraction and provide better swimming conditions for *** study consists of several numerical simulations,first considering the fishway without cylinder elements while testing three different slopes under two different ***,the same numerical simulations were conducted,considering cylinder elements of different diameters and arrangements inside the *** numerical model was validated by comparing computed velocities with those measured experimentally from the *** results show that the maximum velocity and turbulent kinetic energy(TKE)in the main jet increase as the discharge increases on the same *** flow velocity and TKE decrease in the areas inside the pool and between the two *** cylinder elements inside the fishway reduces the principal flow’s maximum ***,inside the pool,low-velocity regions were expanding.A comparison between the design with a cylinder and the simple VSF indicates that the presence of a cylinder reduced the maximum velocities for the smallest and highest slopes by 6.21%and 9.86%on average,***,in terms of TKE,cylinders inside the fishway could provide better performance than simple VSF,mainly for low-flow ***,this study’s solution-oriented findings provide insights that could help design cost-effective fishways by improving particularly fish attraction to the fishway.

关键词： Ecohydraulic energy dissipation fish-pass fishway turbulent kinetic energy(TKE)

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DISTRIBUTION OF LOCAL FRICTION IN AN OPEN CHANNEL

DISTRIBUTION OF LOCAL FRICTION IN AN OPEN CHANNEL

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第九次河流泥沙国际学术大会

作者： mirali mohammadi Dept. of Civil Eng. Faculty of Eng. The University of Urmia Urmia 57169-33111 Iran Dept. of Civil Eng. Faculty of Eng. The Islamic Azad University Khoy Unit Khoy Iran

＜正＞In open channels, estimation of the local and global friction factor is one of the most important tasks and it sometimes is very difficult. This difficulty arises from the existence of the secondary flow cells and the boundary induced turbulence, both of which affect the distributions of depth-averaged velocity and boundary shear stress, and consequently the local friction factors. A series of measurements was undertaken for velocity and boundary shear stress in fully developed turbulent uniform flow for a smooth open channel. Equations relating the transverse distribution of apparent shear force across the channel boundary for various flow conditions are presented. The experimental overall friction factors were evaluated from the stage-discharge relationships applying the Darcy-Weisbach equation. Using the measured local depth-averaged velocity, Ud, and me local bed shear stress, τb, the local depth-averaged bed friction factor,fb, can be calculated for each lateral position by applying fb=8τb/ρUd 2 . The lateraldistribution of local depth-averaged friction factors show that the distributions are close together for low flow discharges in both sub critical and supercritical flows, but they are more variable for the higher flow discharges. In other words, the normalized local friction factors, fb/f, illustrate that the discrepancy in the higher flow rates are larger than the lower flow rates. More importantly, the Figures show that the local friction factor values tend towards a more constant distribution at high flow rates as the Froude numbers increase. It can also be seen that the local friction factor is found to be decreased from the sidewalls to the channel centerline.

关键词： Open channel flow Friction factor Depth-averaged velocity Boundary shear stress

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