Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex
Developing management rules to improve downstream migration of salmon smolts in large hydropower plants is essential to limit mortality and migration delay. A 2-year telemetry study was conducted to assess the efficiency of temporary measures to enhance the safety and speed of juvenile salmon passag...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2021-01-01
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| Series: | Knowledge and Management of Aquatic Ecosystems |
| Subjects: | |
| Online Access: | https://www.kmae-journal.org/articles/kmae/full_html/2021/01/kmae200141/kmae200141.html |
| _version_ | 1828963724785876992 |
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| author | Tétard Stéphane Roy Romain Teichert Nils Rancon Jocelyn Courret Dominique |
| author_facet | Tétard Stéphane Roy Romain Teichert Nils Rancon Jocelyn Courret Dominique |
| author_sort | Tétard Stéphane |
| collection | DOAJ |
| description | Developing management rules to improve downstream migration of salmon smolts in large hydropower plants is essential to limit mortality and migration delay. A 2-year telemetry study was conducted to assess the efficiency of temporary measures to enhance the safety and speed of juvenile salmon passage through the Poutès dam (Allier River, France). 124 smolts were tracked through the reservoir and downstream of the dam, during implementation of turbine modulation and/or shutdown during night and reservoir level lowering. Level lowering significantly reduced median residence time from 3.4 days to 4.4 hours. However, even with high spill during turbine modulation, the risk of smolt being drawn toward the turbines was increased at low reservoir level due to the site's configuration, greater proximity to the surface and weak repulsive effect of the rack. Moreover, results revealed that a substantial proportion of smolts can migrate during daytime and twilight during floods, even at the beginning of the migration period. Thus targeted turbine shutdown has a good potential to protect smolts, but implementation requires studies taking account of site specificities and a flexible approach. |
| first_indexed | 2024-12-14T10:34:25Z |
| format | Article |
| id | doaj.art-b767964ba3f240da8df9b0d5626d3931 |
| institution | Directory Open Access Journal |
| issn | 1961-9502 |
| language | English |
| last_indexed | 2024-12-14T10:34:25Z |
| publishDate | 2021-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Knowledge and Management of Aquatic Ecosystems |
| spelling | doaj.art-b767964ba3f240da8df9b0d5626d39312022-12-21T23:06:00ZengEDP SciencesKnowledge and Management of Aquatic Ecosystems1961-95022021-01-010422410.1051/kmae/2021004kmae200141Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complexTétard StéphaneRoy Romain0Teichert Nils1https://orcid.org/0000-0002-8873-9613Rancon Jocelyn2Courret Dominique3EDF R&D LNHE - Laboratoire National d'Hydraulique et Environnement, 6 Quai WatierLaboratoire Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Muséum National d'Histoire Naturelle, CNRS FRE 2030, Sorbonne Université, IRD 207, Université de Caen Normandie, Université des Antilles, Centre de Recherche et d'Enseignement sur les Systèmes Côtiers, station de biologie marine de Dinard, 38 rue du Port BlancCNSS, LarmaOffice Français de la Biodiversité − DRAS, Pôle R&D Ecohydraulique OFB-IMFT-PPRIME, IMFT, 2 Allée du Professeur Camille SoulaDeveloping management rules to improve downstream migration of salmon smolts in large hydropower plants is essential to limit mortality and migration delay. A 2-year telemetry study was conducted to assess the efficiency of temporary measures to enhance the safety and speed of juvenile salmon passage through the Poutès dam (Allier River, France). 124 smolts were tracked through the reservoir and downstream of the dam, during implementation of turbine modulation and/or shutdown during night and reservoir level lowering. Level lowering significantly reduced median residence time from 3.4 days to 4.4 hours. However, even with high spill during turbine modulation, the risk of smolt being drawn toward the turbines was increased at low reservoir level due to the site's configuration, greater proximity to the surface and weak repulsive effect of the rack. Moreover, results revealed that a substantial proportion of smolts can migrate during daytime and twilight during floods, even at the beginning of the migration period. Thus targeted turbine shutdown has a good potential to protect smolts, but implementation requires studies taking account of site specificities and a flexible approach.https://www.kmae-journal.org/articles/kmae/full_html/2021/01/kmae200141/kmae200141.htmlatlantic salmondownstream migrationmigratory delayoperational managementturbine shutdown |
| spellingShingle | Tétard Stéphane Roy Romain Teichert Nils Rancon Jocelyn Courret Dominique Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex Knowledge and Management of Aquatic Ecosystems atlantic salmon downstream migration migratory delay operational management turbine shutdown |
| title | Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex |
| title_full | Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex |
| title_fullStr | Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex |
| title_full_unstemmed | Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex |
| title_short | Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex |
| title_sort | temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex |
| topic | atlantic salmon downstream migration migratory delay operational management turbine shutdown |
| url | https://www.kmae-journal.org/articles/kmae/full_html/2021/01/kmae200141/kmae200141.html |
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