Bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks
International audience Hydropower energy can contribute to achieve the carbon neutrality goals, but also needs to reach environmental sustainability. Hydropower plants (HPP) constitute barriers to fish migrations that are essential for accomplishing their complete biological cycle. Fish downstream p...
Published in: | Knowledge & Management of Aquatic Ecosystems |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2023
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Subjects: | |
Online Access: | https://ut3-toulouseinp.hal.science/hal-04124267 https://ut3-toulouseinp.hal.science/hal-04124267/document https://ut3-toulouseinp.hal.science/hal-04124267/file/2023_Tomanova.pdf https://doi.org/10.1051/kmae/2023011 |
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ftunivpoitiers:oai:HAL:hal-04124267v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Poitiers: Publications de nos chercheurs.ses (HAL) |
op_collection_id |
ftunivpoitiers |
language |
English |
topic |
Hydropower plant fish protection downstream passage surface bypass [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] |
spellingShingle |
Hydropower plant fish protection downstream passage surface bypass [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] Tomanova, Sylvie Tissot, Laurence Tétard, Stéphane Richard, Sylvain Mercier, Olivier Mataix, Vincent Frey, Aurélien Lagarrigue, Thierry Tedesco, Pablo, A. Courret, Dominique Bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks |
topic_facet |
Hydropower plant fish protection downstream passage surface bypass [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] |
description |
International audience Hydropower energy can contribute to achieve the carbon neutrality goals, but also needs to reach environmental sustainability. Hydropower plants (HPP) constitute barriers to fish migrations that are essential for accomplishing their complete biological cycle. Fish downstream passage solutions (FDPS) have to be implemented to maximize their survival, guiding them away from the turbine intakes towards a safe passage alternative. Recent telemetry studies confirmed the efficiency of 26°inclined low bar spacing (20 mm) rack associated to surface bypasses, installed upstream HPPs, to protect downstream migrating Atlantic salmon smolts. Here we tested the efficiency of such FDPS for eel protection using radiotelemetry at four successive HPPs (with intake capacities from 28 to 45 m 3 .s À1) in the Ariège River (southern France). Between 52 and 74 eels, longer than 550 mm, entered the HPP intakes and 100% of them were protected from turbine passage. All eels crossed the HPP water intake using the surface bypasses, and the great majority in few minutes from their first presentation in front of the rack. These results showed that in such rack configuration, it is not necessary to add a specific bottom bypass, usually recommended for eels. We also showed the importance of optimal hydraulic conditions, mainly tangential (parallel to the rack) velocity and bypass discharge, to efficiently guide the eels towards the surface bypasses, reducing their passage time. Overall, our study provided key elements to water managers for designing an efficient FDPS for eels. |
author2 |
Office français de la biodiversité - Pôle Ecohydraulique OFB - IMFT - P' (Pôle écohydraulique OFB - IMFT - P') Institut de mécanique des fluides de Toulouse (IMFT) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Institut Pprime (PPRIME) Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Office français de la biodiversité (OFB) Université de Toulouse (UT) Laboratoire National d’Hydraulique et Environnement (EDF R&D LNHE) EDF R&D (EDF R&D) EDF (EDF)-EDF (EDF) ICEO Environnement EDF CIH Etudes et Conseils en Gestion de l'Environnement Aquatique - ECOGEA (FRANCE) Evolution et Diversité Biologique (EDB) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Tomanova, Sylvie Tissot, Laurence Tétard, Stéphane Richard, Sylvain Mercier, Olivier Mataix, Vincent Frey, Aurélien Lagarrigue, Thierry Tedesco, Pablo, A. Courret, Dominique |
author_facet |
Tomanova, Sylvie Tissot, Laurence Tétard, Stéphane Richard, Sylvain Mercier, Olivier Mataix, Vincent Frey, Aurélien Lagarrigue, Thierry Tedesco, Pablo, A. Courret, Dominique |
author_sort |
Tomanova, Sylvie |
title |
Bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks |
title_short |
Bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks |
title_full |
Bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks |
title_fullStr |
Bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks |
title_full_unstemmed |
Bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks |
title_sort |
bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://ut3-toulouseinp.hal.science/hal-04124267 https://ut3-toulouseinp.hal.science/hal-04124267/document https://ut3-toulouseinp.hal.science/hal-04124267/file/2023_Tomanova.pdf https://doi.org/10.1051/kmae/2023011 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
ISSN: 1961-9502 Knowledge and Management of Aquatic Ecosystems https://ut3-toulouseinp.hal.science/hal-04124267 Knowledge and Management of Aquatic Ecosystems, 2023, 424, pp.1-12. ⟨10.1051/kmae/2023011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1051/kmae/2023011 hal-04124267 https://ut3-toulouseinp.hal.science/hal-04124267 https://ut3-toulouseinp.hal.science/hal-04124267/document https://ut3-toulouseinp.hal.science/hal-04124267/file/2023_Tomanova.pdf doi:10.1051/kmae/2023011 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1051/kmae/2023011 |
container_title |
Knowledge & Management of Aquatic Ecosystems |
container_issue |
424 |
container_start_page |
15 |
_version_ |
1782332297389801472 |
spelling |
ftunivpoitiers:oai:HAL:hal-04124267v1 2023-11-12T04:14:43+01:00 Bypass discharge, approach velocities and bar spacing: the three key-parameters to efficiently protect silver eels with inclined racks Tomanova, Sylvie Tissot, Laurence Tétard, Stéphane Richard, Sylvain Mercier, Olivier Mataix, Vincent Frey, Aurélien Lagarrigue, Thierry Tedesco, Pablo, A. Courret, Dominique Office français de la biodiversité - Pôle Ecohydraulique OFB - IMFT - P' (Pôle écohydraulique OFB - IMFT - P') Institut de mécanique des fluides de Toulouse (IMFT) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Institut Pprime (PPRIME) Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Office français de la biodiversité (OFB) Université de Toulouse (UT) Laboratoire National d’Hydraulique et Environnement (EDF R&D LNHE) EDF R&D (EDF R&D) EDF (EDF)-EDF (EDF) ICEO Environnement EDF CIH Etudes et Conseils en Gestion de l'Environnement Aquatique - ECOGEA (FRANCE) Evolution et Diversité Biologique (EDB) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS) 2023 https://ut3-toulouseinp.hal.science/hal-04124267 https://ut3-toulouseinp.hal.science/hal-04124267/document https://ut3-toulouseinp.hal.science/hal-04124267/file/2023_Tomanova.pdf https://doi.org/10.1051/kmae/2023011 en eng HAL CCSD EDP sciences/ONEMA info:eu-repo/semantics/altIdentifier/doi/10.1051/kmae/2023011 hal-04124267 https://ut3-toulouseinp.hal.science/hal-04124267 https://ut3-toulouseinp.hal.science/hal-04124267/document https://ut3-toulouseinp.hal.science/hal-04124267/file/2023_Tomanova.pdf doi:10.1051/kmae/2023011 info:eu-repo/semantics/OpenAccess ISSN: 1961-9502 Knowledge and Management of Aquatic Ecosystems https://ut3-toulouseinp.hal.science/hal-04124267 Knowledge and Management of Aquatic Ecosystems, 2023, 424, pp.1-12. ⟨10.1051/kmae/2023011⟩ Hydropower plant fish protection downstream passage surface bypass [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] info:eu-repo/semantics/article Journal articles 2023 ftunivpoitiers https://doi.org/10.1051/kmae/2023011 2023-11-01T17:36:14Z International audience Hydropower energy can contribute to achieve the carbon neutrality goals, but also needs to reach environmental sustainability. Hydropower plants (HPP) constitute barriers to fish migrations that are essential for accomplishing their complete biological cycle. Fish downstream passage solutions (FDPS) have to be implemented to maximize their survival, guiding them away from the turbine intakes towards a safe passage alternative. Recent telemetry studies confirmed the efficiency of 26°inclined low bar spacing (20 mm) rack associated to surface bypasses, installed upstream HPPs, to protect downstream migrating Atlantic salmon smolts. Here we tested the efficiency of such FDPS for eel protection using radiotelemetry at four successive HPPs (with intake capacities from 28 to 45 m 3 .s À1) in the Ariège River (southern France). Between 52 and 74 eels, longer than 550 mm, entered the HPP intakes and 100% of them were protected from turbine passage. All eels crossed the HPP water intake using the surface bypasses, and the great majority in few minutes from their first presentation in front of the rack. These results showed that in such rack configuration, it is not necessary to add a specific bottom bypass, usually recommended for eels. We also showed the importance of optimal hydraulic conditions, mainly tangential (parallel to the rack) velocity and bypass discharge, to efficiently guide the eels towards the surface bypasses, reducing their passage time. Overall, our study provided key elements to water managers for designing an efficient FDPS for eels. Article in Journal/Newspaper Atlantic salmon Université de Poitiers: Publications de nos chercheurs.ses (HAL) Knowledge & Management of Aquatic Ecosystems 424 15 |