Author(s): Nika Jahangiri; Cumhur Ozbey; Mehmet Salih Turker And Serhat Kucukali

Linked Author(s):

Keywords: Vertical slot fish pass; Prototype measurements; Turbulent kinetic energy; Numerical modeling

Abstract: The vertical profiles of the resultant velocity and turbulent kinetic energy were analyzed at the vertical slot fish pass located at the Cataloluk Small Hydropower Plant in the Ceyhan River Basin of Turkey. In this regard, a hybrid model covering the prototype measurements and numerical modeling was employed for the cases with and without brush blocks. For both cases, numerical results were validated with both prototype measurements by using the Large Eddy Simulation (LES) with a mesh size of 0.01 m. We employed the Darcy-Forchheimer porous media approach to model the brush blocks in the simulations. We obtained satisfactory results for the prediction of turbulent kinetic energy in all simulated cases. Also, it was revealed that, due to the plunging effect, the spatially-averaged turbulent kinetic energy within the pool tended to increase as the vertical distance from the bed increased. However, the spatially-averaged local resultant velocity was numerically shown to remain almost constant throughout the vertical profile in the pool, which is also consistent with the field observations. This finding indicates the necessity of 3D modeling of the turbulent flow characteristics at the vertical slot fish passes, rather than 2D modeling as in the existing studies.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P2000-cd

Year: 2025