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Numerical modelling of free surface flows on round vertical slot fish passes

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2019
Koçal, Çiğdem
Dams and weirs built on the rivers block the flow and prevent fishes from migrating along the river. To overcome this problem, fish passes can be built at those blocked locations along the river by providing a gently sloped channel with low flow rates and enough water depth to allow fish to ascend. Considering the design process, understanding the hydrodynamics inside fish pass structures is important. By using three dimensional numerical simulations, parameters like flow rates, velocity, turbulence and water depth inside the fish pass can be obtained. In this study, a relatively new type of vertical slot fish pass called round vertical slot fish pass is investigated numerically and adopted to Uzungöl Weir-1. Comparing with the previous study of Özkaya (2014) on conventional vertical slot fish passes, it was observed that round vertical slot fish passes have advantage in terms of lower turbulent kinetic energy values inside the resting pools. It is also shown that with numerical modelling different design alternatives can be tested easily without the need of expensive physical models.