Protection and Guidance of Downstream Moving Fish with Electrified Horizontal Bar Rack Bypass Systems ...

Horizontal bar rack bypass systems (HBR-BS) are characterized by a horizontal bar rack (HBR) with narrow clear bar spacing of 10–20 mm and an adjacent bypass (BS) to efficiently protect and guide downstream moving fish at water intakes. The small bar spacing may lead to operational challenges, such...

Full description

Bibliographic Details
Main Authors: Meister, Julian, Moldenhauer-Roth, Anita, Beck, Claudia, Selz, Oliver M., Peter, Armin, Albayrak, Ismail, Boes, Robert
Format: Article in Journal/Newspaper
Language:English
Published: ETH Zurich 2021
Subjects:
behavioral barrier
downstream fish movement
Ecohydraulics
electric barrier
Fish behavior
fish guidance structure
Fish protection
pulsed direct current
Anguilla anguilla
Online Access:https://dx.doi.org/10.3929/ethz-b-000508853
http://hdl.handle.net/20.500.11850/508853
Description
Summary:Horizontal bar rack bypass systems (HBR-BS) are characterized by a horizontal bar rack (HBR) with narrow clear bar spacing of 10–20 mm and an adjacent bypass (BS) to efficiently protect and guide downstream moving fish at water intakes. The small bar spacing may lead to operational challenges, such as clogging and high head losses. This study investigated whether combining an HBR with a low-voltage electric field (e-HBR) allows one to increase the clear bar spacing while maintaining a high standard of fish protection and guidance efficiency. To this end, an HBR-BS with 20 mm bar spacing and an e-HBR-BS with 20 and 51 mm bar spacing were tested with spirlin (Alburnoides bipunctatus) and European eel (Anguilla anguilla) in a laboratory flume. The racks were electrified with 38 V pulsed direct current. The protection efficiency of the e-HBR with 51 mm was 96% for spirlin and 86% for eels, which are similar results to those of the HBR with 20 mm. Some eels passed through the e-HBR, but only when they were ... : Water, 13 (19) ...

Similar Items