New publication in the field of ethohydraulics

29/06/2020
Fish swimming in an experimental flume Copyright: IWW

A new research item in the research group energy and environment has been pubished this month. The article "Development and evaluation of an empirical equation for the screening effect of bar racks" has been pubished online on june 29th 2020 in the Journal of Ecohydraulics.

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Elena-Maria Klopries

Senior scientific staff

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+49 241 80 25271

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Anna Wilmink

Scientific staff

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+49 241 80 25530

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Fish protection at hydropower plants

Passage through hydropower plants can cause severe injuries for downstream migrating fish. Bar racks and bypass systems can help to protect fish from turbine-induced mortality if they are designed correctly following guidelines. Currently, it is not possible to assess how effective bar racks are that do not meet design criteria for fish protection.

We introduced the screening effect as a performance parameter for bar racks and developed an equation for determining the screening effect of bar racks for silver eels based on an empirical approach. The equation contains geometrical parameters regarding the bar rack as well as biological parameters regarding eels. With the results of ethohydraulic studies, we showed that the equation is not applicable for roach and Atlantic salmon smolts but rather species-specific. The results can help to perform biological evaluations and plan retrofitting measures of non-optimal bar racks.

The research project Orientation and sounding behaviour of fish in front of screens at hydro power intakes (acronym OVeR) was financed by innogy SE and financially supported by the District Council of Cologne and the Ministry for Environment, Agriculture, Conservation and Consumer Protection of the State of North Rhine-Westphalia (MULNV) within the programme Living Waters in North Rhine-Westphalia. The ethohydraulic studies have been conducted in cooperation with the office for environmental planning, water management and fisheries.

Please find the publication here.