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Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex

Tétard, Stéphane and Roy, Romain and Teichert, Nils and Rancon, Jocelyn and Courret, Dominique Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex. (2021) Knowledge and Management of Aquatic Ecosystems, 422 (4). ISSN 1961-9502

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Official URL: https://doi.org/10.1051/kmae/2021004

Abstract

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.

Item Type:Article
Additional Information:Thanks to EDP Sciences. This article is available at: https://www.kmae-journal.org/. This is an Open Access article distributed under the terms of the Creative Commons Attribution License CC-BY-ND (https://creativecommons.org/licenses/by-nd/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. If you remix, transform, or build upon the material, you may not distribute the modified material.
HAL Id:hal-03181067
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > EDF (FRANCE)
Other partners > Ecole Nationale Supérieure de Mécanique et d'Aérotechnique - ENSMA (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Sorbonne Université (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Caen Basse-Normandie (FRANCE)
Other partners > Université de Poitiers (FRANCE)
Other partners > Office français de la biodiversité - OFB (FRANCE)
Other partners > Conservatoire National du Saumon Sauvage - CNSS (FRANCE)
Other partners > Ingénierie Conseil Expertise - ICEO (FRANCE)
Other partners > Museum National d'Histoire Naturelle - MNHN (FRANCE)
Other partners > Université des Antilles et de la Guyane (FRANCE)
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Deposited On:03 Mar 2021 09:01

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