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The effect of channel constriction on the potential for tidal stream power

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  • Smeaton, Malcolm
  • Vennell, Ross
  • Harang, Alice

Abstract

Tidal channels with narrow constrictions are attractive sites for electricity generation due to energy dense, high velocity flow through the constricted zones. This work uses a 1D model to systematically examine the effect of constriction on channel potential (theoretical maximum power) and transport in channels connecting two large water bodies (Type I) and channels connecting a large water body to an embayment/lagoon (Type II). Type I channels showed a monotonic decrease in potential and transport with increasing constriction due to enhanced bottom drag from the resultant high velocity zone. The effect of constriction on potential and transport in Type II channels varies depending on the relative geometries of the channel and embayment. Type II channels may be geometrically modified to increase power and in some instances this would simultaneously produce a high velocity zone. The flow reduction required to achieve a channel’s potential was invariant to changes in constriction for Type I channels and also Type II channels if a “lagoon geometry factor” is less than about 4. A simple approximation for potential provided in the literature for unconstricted channels is extended for use with constricted channels and an approximation for the drag coefficient required to achieve potential is provided.

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  • Smeaton, Malcolm & Vennell, Ross & Harang, Alice, 2016. "The effect of channel constriction on the potential for tidal stream power," Renewable Energy, Elsevier, vol. 99(C), pages 45-56.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:45-56
    DOI: 10.1016/j.renene.2016.06.013
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    References listed on IDEAS

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    1. Draper, Scott & Adcock, Thomas A.A. & Borthwick, Alistair G.L. & Houlsby, Guy T., 2014. "Estimate of the tidal stream power resource of the Pentland Firth," Renewable Energy, Elsevier, vol. 63(C), pages 650-657.
    2. Vennell, Ross & Funke, Simon W. & Draper, Scott & Stevens, Craig & Divett, Tim, 2015. "Designing large arrays of tidal turbines: A synthesis and review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 454-472.
    3. Vennell, Ross, 2012. "The energetics of large tidal turbine arrays," Renewable Energy, Elsevier, vol. 48(C), pages 210-219.
    4. Vennell, Ross, 2013. "Exceeding the Betz limit with tidal turbines," Renewable Energy, Elsevier, vol. 55(C), pages 277-285.
    5. Carballo, R. & Iglesias, G. & Castro, A., 2009. "Numerical model evaluation of tidal stream energy resources in the Ría de Muros (NW Spain)," Renewable Energy, Elsevier, vol. 34(6), pages 1517-1524.
    6. Vennell, Ross, 2011. "Estimating the power potential of tidal currents and the impact of power extraction on flow speeds," Renewable Energy, Elsevier, vol. 36(12), pages 3558-3565.
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    Cited by:

    1. Verbeek, M.C. & Labeur, R.J. & Uijttewaal, W.S.J., 2020. "The performance of a weir-mounted tidal turbine: Field observations and theoretical modelling," Renewable Energy, Elsevier, vol. 153(C), pages 601-614.

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