Author(s): Markus Aufleger; Barbara Brinkmeier

Linked Author(s): Markus Aufleger

Keywords: Hydropower; Fish protection; Turbine intake; Hybrid system; Electrical pulses

Abstract: Hydropower generation, a significant renewable energy source, presents a notable challenge to aquatic ecosystems during fish migration through turbine intakes. Various strategies, including technical fish protection systems, are being explored to mitigate this issue. The current state-of-the-art involves the use of expensive fine screens placed in front of turbine intakes, which require regular maintenance. At the University of Innsbruck, a hybrid fish protection system has been developed, incorporating both a mechanical and behavioral barrier. This design allows for larger screen gaps or clear widths between the bars (typically 50 mm and above) compared to traditional methods. Ethohydraulic experiments indicate that utilizing electrical pulses as a behavioral barrier, in conjunction with the mechanical barrier, achieves reliable fish retention rates. Initial pilot projects have addressed practical challenges, such as cleaning procedures and long-term operation. This hybrid system provides an alternative with potential benefits for fish, potentially reducing fish mortality and maintenance costs in hydropower facilities. It is ready for practical application, with ongoing projects offering insights. Further research is necessary to refine and promote the technology for wider adoption in the hydropower industry, aiming to contribute to more sustainable energy production and minimize ecological impact.

DOI: https://doi.org/10.3929/ethz-b-000675921

Year: 2024