@article{fdi:010088080,
  title = {{B}ypass discharge, approach velocities and bar spacing : the three key-parameters to efficiently protect silver eels with inclined racks},
  author = {{T}omanova, {S}. and {T}issot, {L}. and {T}etard, {S}. and {R}ichard, {S}. and {M}ercier, {O}. and {M}ataix, {V}. and {F}rey, {A}. and {L}agarrigue, {T}. and {T}edesco, {P}ablo and {C}ourret, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{H}ydropower energy can contribute to achieve the carbon neutrality goals, but also needs to reach environmental sustainability. {H}ydropower plants ({HPP}) constitute barriers to fish migrations that are essential for accomplishing their complete biological cycle. {F}ish downstream passage solutions ({FDPS}) have to be implemented to maximize their survival, guiding them away from the turbine intakes towards a safe passage alternative. {R}ecent telemetry studies confirmed the efficiency of 26 degrees inclined low bar spacing (20 mm) rack associated to surface bypasses, installed upstream {HPP}s, to protect downstream migrating {A}tlantic salmon smolts. {H}ere we tested the efficiency of such {FDPS} for eel protection using radiotelemetry at four successive {HPP}s (with intake capacities from 28 to 45 m(3).s(-1)) in the {A}riege {R}iver (southern {F}rance). {B}etween 52 and 74 eels, longer than 550 mm, entered the {HPP} intakes and 100% of them were protected from turbine passage. {A}ll 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. {T}hese results showed that in such rack configuration, it is not necessary to add a specific bottom bypass, usually recommended for eels. {W}e 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. {O}verall, our study provided key elements to water managers for designing an efficient {FDPS} for eels.},
  keywords = {{H}ydropower plant ; fish protection ; downstream passage ; surface bypass ; {FRANCE} ; {ARIEGE}},
  booktitle = {},
  journal = {{K}nowledge and {M}anagement of {A}quatic {E}cosystems},
  numero = {424},
  pages = {15 [12 p.]},
  ISSN = {1961-9502},
  year = {2023},
  DOI = {10.1051/kmae/2023011},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088080},
}