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Tidal Turbines’ Layout in a Stream with Asymmetry and Misalignment

Author

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  • Nicolas Guillou

    (Laboratoire de Génie Côtier et Environnement (LGCE), Cerema, Direction Eau Mer et Fleuves, ER, 155 rue Pierre Bouguer, Technopôle Brest-Iroise, BP 5, 29280 Plouzané, France)

  • Georges Chapalain

    (Laboratoire de Génie Côtier et Environnement (LGCE), Cerema, Direction Eau Mer et Fleuves, ER, 155 rue Pierre Bouguer, Technopôle Brest-Iroise, BP 5, 29280 Plouzané, France)

Abstract

A refined assessment of tidal currents variability is a prerequisite for successful turbine deployment in the marine environment. However, the numerical evaluation of the tidal kinetic energy resource relies, most of the time, on integrated parameters, such as the averaged or maximum stream powers. Predictions from a high resolution three-dimensional model are exploited here to characterize the asymmetry and misalignment between the flood and ebb tidal currents in the “Raz de Sein”, a strait off western Brittany (France) with strong potential for array development. A series of parameters is considered to assess resource variability and refine the cartography of local potential tidal stream energy sites. The strait is characterized by strong tidal flow divergence with currents’ asymmetry liable to vary output power by 60% over a tidal cycle. Pronounced misalignments over 20 ∘ are furthermore identified in a great part of energetic locations, and this may account for a deficit of the monthly averaged extractable energy by more than 12%. As sea space is limited for turbines, it is finally suggested to aggregate flood and ebb-dominant stream powers on both parts of the strait to output energy with reduced asymmetry.

Suggested Citation

  • Nicolas Guillou & Georges Chapalain, 2017. "Tidal Turbines’ Layout in a Stream with Asymmetry and Misalignment," Energies, MDPI, vol. 10(11), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1892-:d:119280
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    References listed on IDEAS

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    1. 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.
    2. Thiébot, Jérôme & Bailly du Bois, Pascal & Guillou, Sylvain, 2015. "Numerical modeling of the effect of tidal stream turbines on the hydrodynamics and the sediment transport – Application to the Alderney Race (Raz Blanchard), France," Renewable Energy, Elsevier, vol. 75(C), pages 356-365.
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    Cited by:

    1. Guillou, Nicolas & Chapalain, Georges, 2018. "Annual and seasonal variabilities in the performances of wave energy converters," Energy, Elsevier, vol. 165(PB), pages 812-823.
    2. Van Thinh Nguyen & Alina Santa Cruz & Sylvain S. Guillou & Mohamad N. Shiekh Elsouk & Jérôme Thiébot, 2019. "Effects of the Current Direction on the Energy Production of a Tidal Farm: The Case of Raz Blanchard (France)," Energies, MDPI, vol. 12(13), pages 1-20, June.
    3. Guillou, Nicolas & Thiébot, Jérôme & Chapalain, Georges, 2019. "Turbines’ effects on water renewal within a marine tidal stream energy site," Energy, Elsevier, vol. 189(C).
    4. María José Suárez-López & Rodolfo Espina-Valdés & Víctor Manuel Fernández Pacheco & Antonio Navarro Manso & Eduardo Blanco-Marigorta & Eduardo Álvarez-Álvarez, 2019. "A Review of Software Tools to Study the Energetic Potential of Tidal Currents," Energies, MDPI, vol. 12(9), pages 1-19, May.

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