Author(s): Carl Robert Kriewitz; Jill Lucas; Adriano Lais
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Abstract: An important aspect of the process of water body restoration deals with the recreation of the flow continuum. This includes enabling the up-and downstream migration of fish, which can be hindered by run-of-river power plants. Currently especially the downstream migration that is vital to the preservation of quite a few European fish species is negatively affected. The revised Water Protection Act introduced in January 2011 in Switzerland demands that the major damages caused by men to the Swiss river ecosystems will have to be rectified within the next 20years. This is a great challenge for the energy companies and cantons alike. The Laboratory of Hydraulics, Hydrology and Glaciology (VAW) conducted hydraulic model tests on a future wate power station at the Aare River planned to supply the natural river arm with an increased discharge of 40 m3/s. To facilitate a safe downstream fish migration a horizonta guidance screen with a bypass system was tested Simultaneously the intake structure was optimized fo optimal turbine performance and it was found that both processes went hand in hand. The article gives an overview of the project and presents the hydraulic model test results.
Year: 2012