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The impact of seabed rock roughness on tidal stream power extraction

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  • Guillou, Nicolas
  • Thiébot, Jérôme

Abstract

Numerical assessments of environmental disturbances induced by a tidal farm project rely usually on local modifications of the friction coefficient over the area covered by a proposed array. Nevertheless, no study has investigated the sensitivity of predictions to surrounding seabed friction. The present investigation focuses on impacts of roughness parameterisation of rock outcrops, a typical seabed of tidal stream sites. A high-resolution depth-averaged circulation model is implemented in the Fromveur Strait off western Brittany, a region with strong potential for array development, integrating the heterogeneity of sediment bottom types. Rock roughness strongly influences initial predictions of tidal current and kinetic energy in the Strait with variations of available power up to 30 %. Tidal energy extraction induces noticeable reductions of tidal currents and bottom shear stresses up to 15 km from the array considered till surrounding sandbanks. Rock roughness impacts farm-induced modifications of tidal currents, bottom shear stresses and stream powers till north-eastern and southward edges of the Strait with major absolute differences identified in its central part. Surrounding sandbanks are finally suggested to variations of shear stresses from 9 to 17 % over the Bank of the Four with possible implications on local sediment deposition.

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  • Guillou, Nicolas & Thiébot, Jérôme, 2016. "The impact of seabed rock roughness on tidal stream power extraction," Energy, Elsevier, vol. 112(C), pages 762-773.
    • Handle: RePEc:eee:energy:v:112:y:2016:i:c:p:762-773
    DOI: 10.1016/j.energy.2016.06.053
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    Cited by:

    1. 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.
    2. Silvio Barbarelli & Benedetto Nastasi, 2021. "Tides and Tidal Currents—Guidelines for Site and Energy Resource Assessment," Energies, MDPI, vol. 14(19), pages 1-20, September.
    3. 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.
    4. 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.
    5. Guillou, Nicolas & Thiébot, Jérôme & Chapalain, Georges, 2019. "Turbines’ effects on water renewal within a marine tidal stream energy site," Energy, Elsevier, vol. 189(C).
    6. Soto-Rivas, Karina & Richter, David & Escauriaza, Cristian, 2022. "Flow effects of finite-sized tidal turbine arrays in the Chacao Channel, Southern Chile," Renewable Energy, Elsevier, vol. 195(C), pages 637-647.
    7. 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.
    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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