Turbulence characterization at tidal-stream energy site in Alderney Race - INSU - Institut national des sciences de l'Univers
Chapitre D'ouvrage Année : 2020

Turbulence characterization at tidal-stream energy site in Alderney Race

Résumé

Alderney Race is a site with high tidal-stream energy potential. Current velocity measurements by two bottom-mounted ADCP are used to assess the variability of velocity and turbulence in the water column. Turbulence metrics such as the dissipation rate (ε) of turbulence kinetic energy and the integral lengthscale (L) were estimated through the spectral approach and compared to the turbulence intensity (I). The mooring locations match areas with very different turbulence regime. At the northern ADCP site, characterized by higher current speed, all turbulence parameters were found larger. This enhancement is assumed to result from the current interaction with irregularities of the bathymetry and the friction effect. At the southern site, over a relatively smooth bathymetry, the temporal variability of turbulence was found depended on the velocity shear. These results highlight large spatial variability in turbulence characteristics occurring at rather short distance (4 km) within the prospective site.
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Dates et versions

insu-04401841 , version 1 (19-01-2024)

Identifiants

Citer

Alexei Sentchev, Maxime Thiébaut, Sylvain Guillou. Turbulence characterization at tidal-stream energy site in Alderney Race. Guedes Soares, Carlos. Developments in Renewable Energies Offshore Proceedings of the 4th International Conference on Renewable Energies Offshore (RENEW 2020, 12 - 15 October 2020, Lisbon, Portugal), CRC Press, pp.616-623, 2020, 978-0367681319. ⟨10.1201/9781003134572⟩. ⟨insu-04401841⟩
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