High fluid shear strain causes injury in silver shark

Preliminary implications for Mekong hydropower turbine design

Lee Baumgartner, Garry Thorncraft, Oudom Phonekhampheng, Craig Boys, Anna Navarro Cuenca, Wayne Robinson, R. Brown, Z.D. Deng

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The Lower Mekong Basin is facing unprecedented threats to fish diversity from hydropowerdevelopment. There is increasing pressure on developers and construction authoritiesto design solutions to improve fish survival through turbines, thus protectingthe resources in regions being developed for hydropower. A hydraulic characteristic ofhydropower turbines with known fisheries impacts is fluid shear stress. Elevated shearstress occurs where rapidly flowing water passes near spillways, screens and withinturbine draft tubes. Shear stress can have adverse impacts on fish, but no work hasassessed whether this holds true for Mekong River species. A flume was used to determinecritical tolerances of silver shark, Balantiocheilos melanopterus (Bleeker), toshear stress rates at a high-velocity jet which simulated a hydropower turbine. Fishwere assessed for injury or mortality following exposure. Results were comparedagainst a no-shear control. Injury and mortality were greater at higher shear stressexposures. Injuries occurred at all shear exposure levels with mortality at shear levelshigher than 600/s. This approach should help design future hydropower turbines ifdata on other species demonstrate similar results. If the likelihood of adverse impact ishigh, then shear stress will need to be considered in the design of future hydropowerfacilities.
Original languageEnglish
Pages (from-to)193-198
Number of pages6
JournalFisheries Management and Ecology
Volume24
Issue number3
DOIs
Publication statusPublished - 2017

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turbines
water power
shear strain
shark
sharks
silver
turbine
shear stress
fluid
mortality
fish
spillway
Mekong River
tolerance
fishery
hydraulics
fluids
resource
basin
river

Cite this

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title = "High fluid shear strain causes injury in silver shark: Preliminary implications for Mekong hydropower turbine design",
abstract = "The Lower Mekong Basin is facing unprecedented threats to fish diversity from hydropowerdevelopment. There is increasing pressure on developers and construction authoritiesto design solutions to improve fish survival through turbines, thus protectingthe resources in regions being developed for hydropower. A hydraulic characteristic ofhydropower turbines with known fisheries impacts is fluid shear stress. Elevated shearstress occurs where rapidly flowing water passes near spillways, screens and withinturbine draft tubes. Shear stress can have adverse impacts on fish, but no work hasassessed whether this holds true for Mekong River species. A flume was used to determinecritical tolerances of silver shark, Balantiocheilos melanopterus (Bleeker), toshear stress rates at a high-velocity jet which simulated a hydropower turbine. Fishwere assessed for injury or mortality following exposure. Results were comparedagainst a no-shear control. Injury and mortality were greater at higher shear stressexposures. Injuries occurred at all shear exposure levels with mortality at shear levelshigher than 600/s. This approach should help design future hydropower turbines ifdata on other species demonstrate similar results. If the likelihood of adverse impact ishigh, then shear stress will need to be considered in the design of future hydropowerfacilities.",
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High fluid shear strain causes injury in silver shark : Preliminary implications for Mekong hydropower turbine design. / Baumgartner, Lee; Thorncraft, Garry; Phonekhampheng, Oudom; Boys, Craig; Navarro Cuenca, Anna; Robinson, Wayne; Brown, R.; Deng, Z.D.

In: Fisheries Management and Ecology, Vol. 24, No. 3, 2017, p. 193-198.

Research output: Contribution to journalArticle

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AU - Boys, Craig

AU - Navarro Cuenca, Anna

AU - Robinson, Wayne

AU - Brown, R.

AU - Deng, Z.D.

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