Author(s): Hannes Zoschg; Bernhard Zeiringer; Gunther Unfer; Ruben Tutzer; Markus Aufleger

Linked Author(s): Hannes Zöschg, bernhard zeiringer, Günther Unfer, Ruben Tutzer, Markus Aufleger

Keywords: Fish Protection; Hydropower Plant; CFD; Fish Passage

Abstract: When migrating downstream, fish usually follow the main current, which typically leads them to the turbines of hydropower plants (HPPs). When fish pass through the turbines, they can be injured or even killed. To prevent fish damage, fish guidance structures (FGS) in combination with bypass-systems provide a safe downstream migration corridor. However, the fish guiding efficiency (FGE) as well as the fish protection efficiency (FPE) of such structures are largely dependent on species- and site-specific conditions. In the design of new HPPs as well as in the ecological adaption of existing ones, there is no general solution for the implementation of FGS. Instead, the “trial and error” approach is often used. To investigate the influence of specific geometric and hydraulic parameters of HPPs on downstream migrating fish, a 3D numerical approach using the software ANSYS Fluent 19 was applied in this study. The flow conditions upstream of simplified HPPs were simulated and evaluated regarding FGE and FPE. Based on a parameter analysis, general results were derived, e.g. concerning the effects of rake angle or design type of HPPs. Furthermore, the present study illustrates the importance of investigating the flow conditions and evaluating FGE and FPE in the planning of appropriate measures at HPPs.

DOI: https://doi.org/10.3850/IAHR-39WC2521711920221816

Year: 2022