Simulation-driven design with computational fluid dynamics has been used to evaluate the flow downstream of a hydropower\r\nplant with regards to upstream migrating fish. Field measurements with an Acoustic Doppler Current Profiler were performed, and\r\nthe measurements were used to validate the simulations. The measurements indicate a more unstable flow than the simulations,\r\nand the tailrace jet from the turbines is stronger in the simulations. A fishway entrance was included in the simulations, and the\r\nsubsequent attraction water was evaluated for two positions and two angles of the entrance at different turbine discharges. Results\r\nshow that both positions are viable and that a position where the flow from the fishway does not have to compete with the flow\r\nfrom the power plant will generate superior attraction water. Simulations were also performed for further downstream where the\r\nflow from the turbines meets the old river bed which is the current fish passage for upstream migrating fish. A modification of the\r\nold river bed was made in the model as one scenario to generate better attraction water. This considerably increases the attraction\r\nwater although it cannot compete with the flow from the tailrace tunnel.
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