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Design of horizontal screens at hydropower facilities for downstream migration of salmon smolts and eels

Research project of The Chair of Hydraulic Engineering

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Short description

In order to provide planners and operators with information on the dimensioning of a horizontal screen as a fish protection device, a research project was initiated jointly by EnBW Energie Baden-Württemberg AG and the Technical University of Darmstadt.

The project work included both the flow- and loss-generating representation and analysis of a realistic inclined rake in the laboratory and in the field at an EnBW hydropower plant and ethohydraulic experiments with salmon smolts and eels, which were again carried out in the laboratory and in the field. In addition, a current field was generated at the inclined rake in the laboratory to investigate the effectiveness of a so-called hybrid rake – a combination of mechanical barrier and behavioral barrier – specifically on eels. To validate these laboratory tests, a similar hybrid barrier was installed at another EnBW power plant and its effectiveness for eels was investigated.

Horizontal screen in laboratory and field use
Horizontal screen in laboratory and field use

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