Development of low-voltage electrified fish guidance racks for safe downstream fish migration
Downstream moving fish may have to pass through turbines or spillways of run-of-river hydropower plants, which can result in life-threatening injuries and thereby impact whole populations or species. Fish guidance structures such as a vertical curved-bar rack (CBR) or horizontal bar rack (HBR) in co...
Published in: | Proceedings of the 39th IAHR World Congress |
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International Association for Hydro-Environment Engineering and Research (IAHR)
2022
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Online Access: | https://doi.org/10.3850/IAHR-39WC25217119202292 |
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fteawag:oai:dora:eawag_32227 2023-12-24T10:08:22+01:00 Development of low-voltage electrified fish guidance racks for safe downstream fish migration Moldenhauer-Roth, Anita Selz, Oliver M. Albayrak, Ismail Unterberger, Felix Boes, Robert Michael Ortega-Sánchez, Miguel 2022 https://doi.org/10.3850/IAHR-39WC25217119202292 eng eng International Association for Hydro-Environment Engineering and Research (IAHR) Proceedings of the 39th IAHR world congress eawag:32227 isbn: 978-90-832612-1-8 doi:10.3850/IAHR-39WC25217119202292 fish downstream migration fish protection fish behavior electrified horizontal bar rack electrified curved bar rack Proceedings Paper Text 2022 fteawag https://doi.org/10.3850/IAHR-39WC25217119202292 2023-11-27T00:54:32Z Downstream moving fish may have to pass through turbines or spillways of run-of-river hydropower plants, which can result in life-threatening injuries and thereby impact whole populations or species. Fish guidance structures such as a vertical curved-bar rack (CBR) or horizontal bar rack (HBR) in combination with a bypass can safely guide many fish species and different life stage (i.e. sizes) around hydropower plants, thereby providing a safe downstream fish passage route. An HBR acts as a physical barrier for the fish due to narrow bar spacings, while a CBR creates turbulent structures in front of the rack, inducing a behavioral fish guidance and protection effect. HBRs with a bar spacing of 20 mm and CBRs with a bar spacing of 50 mm have shown high protection and guidance efficiencies in laboratory experiments for certain fish sizes and species. However, due to their narrow bar spacing and resulting clogging and maintenance needs, HBRs are currently state-of-the art only at small-to-medium sized hydropower plants. Combining an HBR with a low voltage electric field (e-HBR) may permit the use of larger bar spacings, thereby reducing operational issues while maintaining high protection efficiencies. Also, although a CBR with 50 mm bar spacing showed high protection rates for two cyprinid species in laboratory experiments, European eel ( Anguilla anguilla ) and brown trout (Salmo trutta) were less receptive to hydraulic cues resulting in lower protection rates. Hence, an electrified CBR (e-CBR) may improve the protection efficiency for these and possibly other species. In the present study, the electric fields generated by different electrode setups of both an e-HBR and an e-CBR were numerically simulated to determine suitable configurations. Subsequently, those configurations of e-HBR and e-CBR were tested with European eel in a large laboratory flume at ETH Zurich. The electric fields created by the racks were measured to validate the simulations, and the fish response was analyzed in terms of the local ... Report Anguilla anguilla European eel DORA Eawag Proceedings of the 39th IAHR World Congress 1256 1265 |
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Open Polar |
collection |
DORA Eawag |
op_collection_id |
fteawag |
language |
English |
topic |
fish downstream migration fish protection fish behavior electrified horizontal bar rack electrified curved bar rack |
spellingShingle |
fish downstream migration fish protection fish behavior electrified horizontal bar rack electrified curved bar rack Moldenhauer-Roth, Anita Selz, Oliver M. Albayrak, Ismail Unterberger, Felix Boes, Robert Michael Development of low-voltage electrified fish guidance racks for safe downstream fish migration |
topic_facet |
fish downstream migration fish protection fish behavior electrified horizontal bar rack electrified curved bar rack |
description |
Downstream moving fish may have to pass through turbines or spillways of run-of-river hydropower plants, which can result in life-threatening injuries and thereby impact whole populations or species. Fish guidance structures such as a vertical curved-bar rack (CBR) or horizontal bar rack (HBR) in combination with a bypass can safely guide many fish species and different life stage (i.e. sizes) around hydropower plants, thereby providing a safe downstream fish passage route. An HBR acts as a physical barrier for the fish due to narrow bar spacings, while a CBR creates turbulent structures in front of the rack, inducing a behavioral fish guidance and protection effect. HBRs with a bar spacing of 20 mm and CBRs with a bar spacing of 50 mm have shown high protection and guidance efficiencies in laboratory experiments for certain fish sizes and species. However, due to their narrow bar spacing and resulting clogging and maintenance needs, HBRs are currently state-of-the art only at small-to-medium sized hydropower plants. Combining an HBR with a low voltage electric field (e-HBR) may permit the use of larger bar spacings, thereby reducing operational issues while maintaining high protection efficiencies. Also, although a CBR with 50 mm bar spacing showed high protection rates for two cyprinid species in laboratory experiments, European eel ( Anguilla anguilla ) and brown trout (Salmo trutta) were less receptive to hydraulic cues resulting in lower protection rates. Hence, an electrified CBR (e-CBR) may improve the protection efficiency for these and possibly other species. In the present study, the electric fields generated by different electrode setups of both an e-HBR and an e-CBR were numerically simulated to determine suitable configurations. Subsequently, those configurations of e-HBR and e-CBR were tested with European eel in a large laboratory flume at ETH Zurich. The electric fields created by the racks were measured to validate the simulations, and the fish response was analyzed in terms of the local ... |
author2 |
Ortega-Sánchez, Miguel |
format |
Report |
author |
Moldenhauer-Roth, Anita Selz, Oliver M. Albayrak, Ismail Unterberger, Felix Boes, Robert Michael |
author_facet |
Moldenhauer-Roth, Anita Selz, Oliver M. Albayrak, Ismail Unterberger, Felix Boes, Robert Michael |
author_sort |
Moldenhauer-Roth, Anita |
title |
Development of low-voltage electrified fish guidance racks for safe downstream fish migration |
title_short |
Development of low-voltage electrified fish guidance racks for safe downstream fish migration |
title_full |
Development of low-voltage electrified fish guidance racks for safe downstream fish migration |
title_fullStr |
Development of low-voltage electrified fish guidance racks for safe downstream fish migration |
title_full_unstemmed |
Development of low-voltage electrified fish guidance racks for safe downstream fish migration |
title_sort |
development of low-voltage electrified fish guidance racks for safe downstream fish migration |
publisher |
International Association for Hydro-Environment Engineering and Research (IAHR) |
publishDate |
2022 |
url |
https://doi.org/10.3850/IAHR-39WC25217119202292 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_relation |
Proceedings of the 39th IAHR world congress eawag:32227 isbn: 978-90-832612-1-8 doi:10.3850/IAHR-39WC25217119202292 |
op_doi |
https://doi.org/10.3850/IAHR-39WC25217119202292 |
container_title |
Proceedings of the 39th IAHR World Congress |
container_start_page |
1256 |
op_container_end_page |
1265 |
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1786196151238656000 |