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Modelling effects of tidal currents on waves at a tidal stream energy site

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  • Guillou, Nicolas

Abstract

Whereas tidal stream energy sites may be characterised by significant wave and current interactions, numerical resource assessments routinely ignored these processes neglecting, in particular, current-induced modifications of waves. Here, these effects are investigated in locations exposed to ocean waves, evaluating performances of a phase-averaged numerical wave model to approach observed semi-diurnal modulations of wave heights, periods and directions, off and within the Fromveur Strait (western Brittany), a region with strong potential for tidal array development. The introduction of tidal forcings in the wave model is found to improve predictions by approaching the large-scale influence of current-induced refraction leading to variations of the significant wave height by nearly 30% at the deep-water wave buoy. The model reproduces furthermore, with the inclusion of an additional dissipation term, the localised steepening and waves breaking on negative current gradients, limiting the overestimation of the significant wave height at the shallow-water wave buoy within the Fromveur Strait. Tidal currents may finally lead to a strong increase in wave power, over 100% in northern entrances of straits, contributing to the variability of the wave energy flux.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:114:y:2017:i:pa:p:180-190
    DOI: 10.1016/j.renene.2016.12.031
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    Cited by:

    1. Hong, Ji-Seok & Moon, Jae-Hong & Kim, Taekyun & Cho, Il-Hyoung & Choi, Jongsu & Park, Ji Yong, 2021. "Response of wave energy to tidal currents in the western sea of Jeju Island, Korea," Renewable Energy, Elsevier, vol. 172(C), pages 564-573.
    2. Guillou, Nicolas & Thiébot, Jérôme & Chapalain, Georges, 2019. "Turbines’ effects on water renewal within a marine tidal stream energy site," Energy, Elsevier, vol. 189(C).
    3. Nicolas Guillou & George Lavidas & Bahareh Kamranzad, 2023. "Wave Energy in Brittany (France)—Resource Assessment and WEC Performances," Sustainability, MDPI, vol. 15(2), pages 1-27, January.
    4. Yücenur, G. Nilay & Ipekçi, Ahmet, 2021. "SWARA/WASPAS methods for a marine current energy plant location selection problem," Renewable Energy, Elsevier, vol. 163(C), pages 1287-1298.
    5. Perez, Larissa & Cossu, Remo & Grinham, Alistair & Penesis, Irene, 2022. "Tidal turbine performance and loads for various hub heights and wave conditions using high-frequency field measurements and Blade Element Momentum theory," Renewable Energy, Elsevier, vol. 200(C), pages 1548-1560.
    6. Burić, Melita & Grgurić, Sanja & Mikulčić, Hrvoje & Wang, Xuebin, 2021. "A numerical investigation of tidal current energy resource potential in a sea strait," Energy, Elsevier, vol. 234(C).
    7. Guillou, Nicolas & Chapalain, Georges, 2018. "Annual and seasonal variabilities in the performances of wave energy converters," Energy, Elsevier, vol. 165(PB), pages 812-823.
    8. 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.
    9. 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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