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The influence of waves on the tidal kinetic energy resource at a tidal stream energy site

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  • Guillou, Nicolas
  • Chapalain, Georges
  • Neill, Simon P.

Abstract

Successful deployment of tidal energy converters relies on access to accurate and high resolution numerical assessments of available tidal stream power. However, since suitable tidal stream sites are located in relatively shallow waters of the continental shelf where tidal currents are enhanced, tidal energy converters may experience effects of wind-generated surface-gravity waves. Waves may thus influence tidal currents, and associated kinetic energy, through two non-linear processes: the interaction of wave and current bottom boundary layers, and the generation of wave-induced currents. Here, we develop a three-dimensional tidal circulation model coupled with a phase-averaged wave model to quantify the impact of the waves on the tidal kinetic energy resource of the Fromveur Strait (western Brittany) - a region that has been identified with strong potential for tidal array development. Numerical results are compared with in situ observations of wave parameters (significant wave height, peak period and mean wave direction) and current amplitude and direction 10m above the seabed (the assumed technology hub height for this region). The introduction of waves is found to improve predictions of tidal stream power at 10m above the seabed at the measurement site in the Strait, reducing kinetic energy by up to 9% during storm conditions. Synoptic effects of wave radiation stresses and enhanced bottom friction are more specifically identified at the scale of the Strait. Waves contribute to a slight increase in the spatial gradient of available mean tidal stream potential between the north-western area and the south-eastern part of the Strait. At the scale of the region within the Strait that has been identified for tidal stream array development, the available mean spring tidal stream potential is furthermore reduced by 12% during extreme waves conditions. Isolated effects of wave radiation stresses and enhanced bottom friction lead to a reduction in spring tidal potential of 7.8% and 5.3%, respectively. It is therefore suggested that models used for tidal resource assessment consider the effect of waves in appropriately wave-exposed regions.

Suggested Citation

  • Guillou, Nicolas & Chapalain, Georges & Neill, Simon P., 2016. "The influence of waves on the tidal kinetic energy resource at a tidal stream energy site," Applied Energy, Elsevier, vol. 180(C), pages 402-415.
    • Handle: RePEc:eee:appene:v:180:y:2016:i:c:p:402-415
    DOI: 10.1016/j.apenergy.2016.07.070
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    References listed on IDEAS

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    Cited by:

    1. Neill, Simon P. & Vögler, Arne & Goward-Brown, Alice J. & Baston, Susana & Lewis, Matthew J. & Gillibrand, Philip A. & Waldman, Simon & Woolf, David K., 2017. "The wave and tidal resource of Scotland," Renewable Energy, Elsevier, vol. 114(PA), pages 3-17.
    2. Thiébot, Jérôme & Guillou, Nicolas & Guillou, Sylvain & Good, Andrew & Lewis, Michael, 2020. "Wake field study of tidal turbines under realistic flow conditions," Renewable Energy, Elsevier, vol. 151(C), pages 1196-1208.
    3. Zhang, Zhi & Zhang, Yuquan & Zheng, Yuan & Zhang, Jisheng & Fernandez-Rodriguez, Emmanuel & Zang, Wei & Ji, Renwei, 2023. "Power fluctuation and wake characteristics of tidal stream turbine subjected to wave and current interaction," Energy, Elsevier, vol. 264(C).
    4. Guillou, Nicolas, 2017. "Modelling effects of tidal currents on waves at a tidal stream energy site," Renewable Energy, Elsevier, vol. 114(PA), pages 180-190.
    5. Thiébaut, Maxime & Sentchev, Alexei, 2017. "Asymmetry of tidal currents off the W.Brittany coast and assessment of tidal energy resource around the Ushant Island," Renewable Energy, Elsevier, vol. 105(C), pages 735-747.
    6. Marco Piano & Peter E. Robins & Alan G. Davies & Simon P. Neill, 2018. "The Influence of Intra-Array Wake Dynamics on Depth-Averaged Kinetic Tidal Turbine Energy Extraction Simulations," Energies, MDPI, vol. 11(10), pages 1-21, October.
    7. Guillou, Nicolas & Thiébot, Jérôme & Chapalain, Georges, 2019. "Turbines’ effects on water renewal within a marine tidal stream energy site," Energy, Elsevier, vol. 189(C).
    8. Guillou, Nicolas & Chapalain, Georges, 2018. "Annual and seasonal variabilities in the performances of wave energy converters," Energy, Elsevier, vol. 165(PB), pages 812-823.
    9. Thiébaut, Maxime & Quillien, Nolwenn & Maison, Antoine & Gaborieau, Herveline & Ruiz, Nicolas & MacKenzie, Seumas & Connor, Gary & Filipot, Jean-François, 2022. "Investigating the flow dynamics and turbulence at a tidal-stream energy site in a highly energetic estuary," Renewable Energy, Elsevier, vol. 195(C), pages 252-262.
    10. Guillou, Nicolas & Neill, Simon P. & Robins, Peter E., 2018. "Characterising the tidal stream power resource around France using a high-resolution harmonic database," Renewable Energy, Elsevier, vol. 123(C), pages 706-718.
    11. Guillou, Nicolas & Chapalain, Georges, 2017. "Assessing the impact of tidal stream energy extraction on the Lagrangian circulation," Applied Energy, Elsevier, vol. 203(C), pages 321-332.
    12. Nasteho Djama Dirieh & Jérôme Thiébot & Sylvain Guillou & Nicolas Guillou, 2022. "Blockage Corrections for Tidal Turbines—Application to an Array of Turbines in the Alderney Race," Energies, MDPI, vol. 15(10), pages 1-18, May.
    13. Fairley, I. & Karunarathna, H. & Masters, I., 2018. "The influence of waves on morphodynamic impacts of energy extraction at a tidal stream turbine site in the Pentland Firth," Renewable Energy, Elsevier, vol. 125(C), pages 630-647.
    14. Nicolas Guillou & Georges Chapalain, 2017. "Tidal Turbines’ Layout in a Stream with Asymmetry and Misalignment," Energies, MDPI, vol. 10(11), pages 1-14, November.

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