Physical and hydraulic forces experienced by fish passing through three different low-head hydropower turbines

Craig A. Boys, Brett D. Pflugrath, Melanie Mueller, Joachim Pander, Zhiqun D. Deng, Juergen Geist

    Research output: Contribution to journalSpecial issue

    3 Citations (Scopus)

    Abstract

    Knowing the kinds of physical stress experienced by fish passing through hydropower turbines can help optimise technologies and improve fish passage. This paper assesses the hydraulic conditions experienced through three different low-head turbines (a very low head (VLH), Archimedes screw and horizontal Kaplan turbine), taken using an autonomous sensor. In total, 127 Sensor Fish deployments were undertaken across all three turbines, generating 82 valid datasets. Decompression was rare at the VLH and screw turbines and rarely fell more than 10 kPa below atmospheric pressure. In contrast, the Kaplan was capable of generating pressures as low as 55.5 kPa (∼45 kPa below atmospheric pressure), over shorter periods of time. More severe ratios of pressure changes could, therefore, be expected for both surface- and depth-acclimated fish at the Kaplan than at the other turbines. Strike was another possible source of fish injury (detected in 69-100% of deployments), and although strike severity was highest at the Kaplan, strike was more likely to be encountered at the screw and VLH than the Kaplan turbine. Shear occurred only near the blades of the Kaplan, and not at severe levels. The results demonstrated that low-head hydropower facilities are not without their risks for downstream migrating fish.
    Original languageEnglish
    Pages (from-to)1934–1944
    Number of pages11
    JournalMarine and Freshwater Research
    Volume69
    Issue number12
    DOIs
    Publication statusPublished - 12 Sep 2018

    Fingerprint

    turbines
    water power
    turbine
    Fishes
    fluid mechanics
    Head
    hydraulics
    fish
    Atmospheric Pressure
    screws
    atmospheric pressure
    Pressure
    sensors (equipment)
    Decompression
    sensor
    decompression
    Technology
    shear stress
    Wounds and Injuries

    Cite this

    Boys, Craig A. ; Pflugrath, Brett D. ; Mueller, Melanie ; Pander, Joachim ; Deng, Zhiqun D. ; Geist, Juergen. / Physical and hydraulic forces experienced by fish passing through three different low-head hydropower turbines. In: Marine and Freshwater Research. 2018 ; Vol. 69, No. 12. pp. 1934–1944.
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    abstract = "Knowing the kinds of physical stress experienced by fish passing through hydropower turbines can help optimise technologies and improve fish passage. This paper assesses the hydraulic conditions experienced through three different low-head turbines (a very low head (VLH), Archimedes screw and horizontal Kaplan turbine), taken using an autonomous sensor. In total, 127 Sensor Fish deployments were undertaken across all three turbines, generating 82 valid datasets. Decompression was rare at the VLH and screw turbines and rarely fell more than 10 kPa below atmospheric pressure. In contrast, the Kaplan was capable of generating pressures as low as 55.5 kPa (∼45 kPa below atmospheric pressure), over shorter periods of time. More severe ratios of pressure changes could, therefore, be expected for both surface- and depth-acclimated fish at the Kaplan than at the other turbines. Strike was another possible source of fish injury (detected in 69-100{\%} of deployments), and although strike severity was highest at the Kaplan, strike was more likely to be encountered at the screw and VLH than the Kaplan turbine. Shear occurred only near the blades of the Kaplan, and not at severe levels. The results demonstrated that low-head hydropower facilities are not without their risks for downstream migrating fish.",
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    author = "Boys, {Craig A.} and Pflugrath, {Brett D.} and Melanie Mueller and Joachim Pander and Deng, {Zhiqun D.} and Juergen Geist",
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    Physical and hydraulic forces experienced by fish passing through three different low-head hydropower turbines. / Boys, Craig A.; Pflugrath, Brett D.; Mueller, Melanie; Pander, Joachim; Deng, Zhiqun D.; Geist, Juergen.

    In: Marine and Freshwater Research, Vol. 69, No. 12, 12.09.2018, p. 1934–1944.

    Research output: Contribution to journalSpecial issue

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    AU - Boys, Craig A.

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    AU - Mueller, Melanie

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    N2 - Knowing the kinds of physical stress experienced by fish passing through hydropower turbines can help optimise technologies and improve fish passage. This paper assesses the hydraulic conditions experienced through three different low-head turbines (a very low head (VLH), Archimedes screw and horizontal Kaplan turbine), taken using an autonomous sensor. In total, 127 Sensor Fish deployments were undertaken across all three turbines, generating 82 valid datasets. Decompression was rare at the VLH and screw turbines and rarely fell more than 10 kPa below atmospheric pressure. In contrast, the Kaplan was capable of generating pressures as low as 55.5 kPa (∼45 kPa below atmospheric pressure), over shorter periods of time. More severe ratios of pressure changes could, therefore, be expected for both surface- and depth-acclimated fish at the Kaplan than at the other turbines. Strike was another possible source of fish injury (detected in 69-100% of deployments), and although strike severity was highest at the Kaplan, strike was more likely to be encountered at the screw and VLH than the Kaplan turbine. Shear occurred only near the blades of the Kaplan, and not at severe levels. The results demonstrated that low-head hydropower facilities are not without their risks for downstream migrating fish.

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