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Far-field dynamics of tidal energy extraction in channel networks

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  • Polagye, Brian L.
  • Malte, Philip C.

Abstract

Tidal hydrokinetic power generation involves the conversion of the kinetic power in swiftly moving tidal currents to renewable electricity. Resource assessment is critical to understand the tidal hydrokinetic potential, but is complicated by a number of factors, including far-field effects. These are changes to the tidal regime caused by the increased resistance to flow as power is extracted from a channel network. This study addresses far-field effects in four prototypical channel networks: multiply-connected flow around an island, a branching network in which the flow bifurcates but does not converge downstream, and a network with multiple constrictions in series. These networks are modelled as one-dimensional channels with hydrokinetic power extraction in high current constrictions. Changes to tides, transport, frictional power dissipation, and kinetic power density are quantified for a range of extraction options. Depending on the type of network, the tidal regime may be either locally augmented or reduced by kinetic power extraction. The changes to kinetic power density throughout the network have important implications for resource assessment, particularly for networks with multiple extraction sites. Results suggest that existing analytical methods tend to over- or under-estimate the hydrokinetic resource because they do not allow for changes to the tidal forcing as a consequence of extraction. In general, site-specific numerical modelling is required to quantitatively predict far-field extraction effects and assess the hydrokinetic resource.

Suggested Citation

  • Polagye, Brian L. & Malte, Philip C., 2011. "Far-field dynamics of tidal energy extraction in channel networks," Renewable Energy, Elsevier, vol. 36(1), pages 222-234.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:1:p:222-234
    DOI: 10.1016/j.renene.2010.06.025
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    References listed on IDEAS

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    1. Bryden, Ian G. & Couch, Scott J., 2006. "ME1—marine energy extraction: tidal resource analysis," Renewable Energy, Elsevier, vol. 31(2), pages 133-139.
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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. Bonar, Paul A.J. & Bryden, Ian G. & Borthwick, Alistair G.L., 2015. "Social and ecological impacts of marine energy development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 47(C), pages 486-495.
    3. Funke, S.W. & Kramer, S.C. & Piggott, M.D., 2016. "Design optimisation and resource assessment for tidal-stream renewable energy farms using a new continuous turbine approach," Renewable Energy, Elsevier, vol. 99(C), pages 1046-1061.
    4. Fallon, D. & Hartnett, M. & Olbert, A. & Nash, S., 2014. "The effects of array configuration on the hydro-environmental impacts of tidal turbines," Renewable Energy, Elsevier, vol. 64(C), pages 10-25.
    5. Garcia-Oliva, Miriam & Djordjević, Slobodan & Tabor, Gavin R., 2017. "The influence of channel geometry on tidal energy extraction in estuaries," Renewable Energy, Elsevier, vol. 101(C), pages 514-525.
    6. Work, Paul A. & Haas, Kevin A. & Defne, Zafer & Gay, Thomas, 2013. "Tidal stream energy site assessment via three-dimensional model and measurements," Applied Energy, Elsevier, vol. 102(C), pages 510-519.
    7. Yang, Zhaoqing & Wang, Taiping & Copping, Andrea E., 2013. "Modeling tidal stream energy extraction and its effects on transport processes in a tidal channel and bay system using a three-dimensional coastal ocean model," Renewable Energy, Elsevier, vol. 50(C), pages 605-613.
    8. Cummins, Patrick F., 2013. "The extractable power from a split tidal channel: An equivalent circuit analysis," Renewable Energy, Elsevier, vol. 50(C), pages 395-401.

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