Skip to Main content Skip to Navigation
Journal articles

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

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.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03181067
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Thursday, March 25, 2021 - 1:51:48 PM
Last modification on : Tuesday, June 22, 2021 - 3:11:01 PM
Long-term archiving on: : Saturday, June 26, 2021 - 6:48:39 PM

File

27493_Tetard.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Stéphane Tétard, Romain Roy, Nils Teichert, Jocelyn Rancon, Dominique Courret. Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex. Knowledge and Management of Aquatic Ecosystems, EDP sciences/ONEMA, 2021, 422 (4), pp.0. ⟨10.1051/kmae/2021004⟩. ⟨hal-03181067⟩

Share

Metrics

Record views

109

Files downloads

130