Zur Verringerung von Fischschäden in Turbinen mittels Verhaltensbeeinflussung

Theoretical considerations and observations suggest a strong influence of fish behaviour on resulting damage rates during turbine passage. This opens perspectives for an innovative technique to reduce fish damage by targeted behaviour manipulation, referred to as "IDA". Live fish turbine passage experiments have been conducted to clarify the actual influence of fish behaviour. Three competitive test series with uninfluenced fish, with fish under medical narcosis and with fish influenced by an electric-field-based IDA prototype were conducted at a 35 kW Kaplan turbine at the Hydraulic Engineering Lab of Technical University of Munich in Obernach. The results confirm an influence of fish behaviour on damage rates in consistency with modelling considerations. The findings emphasis the relevance of more detailed considerations of fish damage in turbines and suggest further research in this field. In the given setup the IDA related damage rates were significantly reduced to about 55% compared to normal, uninfluenced fish passage. The IDA technique can provide further increased efficiency for larger turbine sizes and can be of special interest for economically compatible, ecological improvements at existing plants.