Publication:
The development and evaluation of downstream bypasses for juvenile salmonids at small hydroelectric plants in France

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dc.contributor.authorLarinier, M
dc.contributor.authorTravade, F
dc.contributor.editorOdeh M;
dc.coverage.locationBethesda, MD
dc.date2023-09-23T05:56:51.000
dc.date.accessioned2024-04-26T17:02:02Z
dc.date.available2024-04-26T17:02:02Z
dc.date.issued1999
dc.description.abstractExperiments were conducted from 1992 to 1996 at four small-scale hydro-electricplants on salmon rivers in the southwest of France to relate downstream bypass efficiency tohydraulic conditions and to the behaviour of salmon (Salmo salar) and seat trout (S. trutta) smoltsin the intake canal.The maximum turbine discharge varied from 20 to 85 m3/s and the width of intakes varied from 11to 30 m depending on the plant. The surface bypasses were located laterally along the intake atone end of the trashrack. The mean bypass discharges varied from 0.4 to 4 m3/s, or an averageof 2 to 8% of the turbine discharge. The efficiency of the devices was evaluated by the markrecapturetechnique. Radio telemetry was used to monitor movement patterns of salmon andseat trout smolts in front of the intake and near bypass entrances. Depending on the site, themean bypass efficiency was found to be between 17 and 80%. Behaviour of fish in the vicinity ofthe trashrack and the bypass seemed to be largely influenced by the flow pattern. Poor hydraulicconditions (turbulence, strong acceleration, upwellings) and insufficient discharge were identifiedthrough direct and video observations as being responsible for many aborted passages at thebypass entrances.The results suggest that siting of surface bypass systems must take into account flow patterns inboth the trashrack area and intake canal. It is suggested that surface bypasses associated withexisting trashracks may be an acceptable mitigation technology at small-scale hydroelectricprojects where it is not necessary to guarantee a highly efficient downstream passage protection.
dc.identifier.urihttps://hdl.handle.net/20.500.14394/24201
dc.publisherAmerican Fisheries Society
dc.relation.ispartofInnovations in Fish Passage Technology
dc.source.beginpage25
dc.source.endpage42
dc.source.statuspublished
dc.subjectbypass
dc.subjectdownstream bypass
dc.subjecthydroelectric
dc.subjecthydroelectric plants
dc.subjectjuvenile
dc.subjectsalmonids
dc.subjectfish passage
dc.subjectsalmon
dc.subjectSalmon River
dc.subjectefficiency
dc.subjecthydraulic conditions
dc.subjecttrout
dc.subjectsmolt
dc.subjectintake
dc.subjectcanal
dc.subjectsurface bypass
dc.subjectradio telemetry
dc.subjecttelemetry
dc.subjectentrance
dc.subjectturbulence
dc.subjectvideo
dc.subjectbypass systems
dc.subjectflow patterns
dc.subjectmitigation
dc.titleThe development and evaluation of downstream bypasses for juvenile salmonids at small hydroelectric plants in France
dc.typearticle
dc.typearticle
digcom.contributor.authorLarinier, M
digcom.contributor.authorTravade, F
digcom.identifierfishpassage_book_chapters/44
digcom.identifier.contextkey2531498
digcom.identifier.submissionpathfishpassage_book_chapters/44
dspace.entity.typePublication
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