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...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/508853 2024-01-14T09:59:20+01:00 Protection and Guidance of Downstream Moving Fish with Electrified Horizontal Bar Rack Bypass Systems Meister, Julian id_orcid:0 000-0002-2715-6780 Moldenhauer-Roth, Anita id_orcid:0 000-0002-2902-4028 Beck, Claudia id_orcid:0 000-0001-9021-1378 Selz, Oliver M. Peter, Armin Albayrak, Ismail id_orcid:0 000-0002-4613-6726 Boes, Robert id_orcid:0 000-0002-0319-976X 2021 application/application/pdf https://hdl.handle.net/20.500.11850/508853 https://doi.org/10.3929/ethz-b-000508853 en eng MDPI info:eu-repo/semantics/altIdentifier/doi/10.3390/w13192786 info:eu-repo/semantics/altIdentifier/wos/000809850600001 info:eu-repo/grantAgreement/SBFI/H2020/727830 http://hdl.handle.net/20.500.11850/508853 doi:10.3929/ethz-b-000508853 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Water, 13 (19) behavioral barrier downstream fish movement Ecohydraulics electric barrier Fish behavior fish guidance structure Fish protection pulsed direct current info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftethz https://doi.org/20.500.11850/50885310.3929/ethz-b-00050885310.3390/w13192786 2023-12-18T00:50:49Z 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 parallel to the rack. Fish injuries of variable severeness due to the electrification were observed. The results highlight the potential of hybrid barriers for the protection of downstream moving fish. However, fish injuries due to electricity may occur; and reporting applied voltage, electrode geometry, resulting electric field strength and the pulse pattern of the electrified rack setup is necessary to ensure comparability among studies and to avoid injuries. ISSN:2073-4441 Article in Journal/Newspaper Anguilla anguilla ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
behavioral barrier downstream fish movement Ecohydraulics electric barrier Fish behavior fish guidance structure Fish protection pulsed direct current |
spellingShingle |
behavioral barrier downstream fish movement Ecohydraulics electric barrier Fish behavior fish guidance structure Fish protection pulsed direct current Meister, Julian id_orcid:0 000-0002-2715-6780 Moldenhauer-Roth, Anita id_orcid:0 000-0002-2902-4028 Beck, Claudia id_orcid:0 000-0001-9021-1378 Selz, Oliver M. Peter, Armin Albayrak, Ismail id_orcid:0 000-0002-4613-6726 Boes, Robert id_orcid:0 000-0002-0319-976X Protection and Guidance of Downstream Moving Fish with Electrified Horizontal Bar Rack Bypass Systems |
topic_facet |
behavioral barrier downstream fish movement Ecohydraulics electric barrier Fish behavior fish guidance structure Fish protection pulsed direct current |
description |
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 parallel to the rack. Fish injuries of variable severeness due to the electrification were observed. The results highlight the potential of hybrid barriers for the protection of downstream moving fish. However, fish injuries due to electricity may occur; and reporting applied voltage, electrode geometry, resulting electric field strength and the pulse pattern of the electrified rack setup is necessary to ensure comparability among studies and to avoid injuries. ISSN:2073-4441 |
format |
Article in Journal/Newspaper |
author |
Meister, Julian id_orcid:0 000-0002-2715-6780 Moldenhauer-Roth, Anita id_orcid:0 000-0002-2902-4028 Beck, Claudia id_orcid:0 000-0001-9021-1378 Selz, Oliver M. Peter, Armin Albayrak, Ismail id_orcid:0 000-0002-4613-6726 Boes, Robert id_orcid:0 000-0002-0319-976X |
author_facet |
Meister, Julian id_orcid:0 000-0002-2715-6780 Moldenhauer-Roth, Anita id_orcid:0 000-0002-2902-4028 Beck, Claudia id_orcid:0 000-0001-9021-1378 Selz, Oliver M. Peter, Armin Albayrak, Ismail id_orcid:0 000-0002-4613-6726 Boes, Robert id_orcid:0 000-0002-0319-976X |
author_sort |
Meister, Julian |
title |
Protection and Guidance of Downstream Moving Fish with Electrified Horizontal Bar Rack Bypass Systems |
title_short |
Protection and Guidance of Downstream Moving Fish with Electrified Horizontal Bar Rack Bypass Systems |
title_full |
Protection and Guidance of Downstream Moving Fish with Electrified Horizontal Bar Rack Bypass Systems |
title_fullStr |
Protection and Guidance of Downstream Moving Fish with Electrified Horizontal Bar Rack Bypass Systems |
title_full_unstemmed |
Protection and Guidance of Downstream Moving Fish with Electrified Horizontal Bar Rack Bypass Systems |
title_sort |
protection and guidance of downstream moving fish with electrified horizontal bar rack bypass systems |
publisher |
MDPI |
publishDate |
2021 |
url |
https://hdl.handle.net/20.500.11850/508853 https://doi.org/10.3929/ethz-b-000508853 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Water, 13 (19) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3390/w13192786 info:eu-repo/semantics/altIdentifier/wos/000809850600001 info:eu-repo/grantAgreement/SBFI/H2020/727830 http://hdl.handle.net/20.500.11850/508853 doi:10.3929/ethz-b-000508853 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/50885310.3929/ethz-b-00050885310.3390/w13192786 |
_version_ |
1788058502632046592 |