A comprehensive assessment of turbulence at a tidal-stream energy site influenced by wind-generated ocean waves

Type Article
Date 2020-01
Language English
Author(s) Thiébaut Maxime1, Filipot Jean-Francois1, Maisondieu ChristopheORCID2, Damblans Guillaume1, Duarte Rui1, Droniou Eloi3, Chaplain Nicolas4, Guillou Sylvain5
Affiliation(s) 1 : France Énergies Marines, Technopôle Brest-Iroise, 525 Avenue Alexis de Rochon, 29280, Plouzané, France
2 : IFREMER, ZI Pointe du diable, 29280, Plouzané, France
3 : DynamOcean SARL, 57 Rue de Metz, 56000, Vannes, France
4 : iXblue, 46 Quai François Mitterand, 13600, La Ciotat, France
5 : Normandie Univ, UNICAEN, LUSAC, EA4253, Site Universitaire de Cherbourg, Rue Louis Aragon, BP 78, 50130, Cherbourg-Octeville, France
Source Energy (0360-5442) (Elsevier BV), 2020-01 , Vol. 191 , P. 116550 (12p.)
DOI 10.1016/j.energy.2019.116550
WOS© Times Cited 14
Keyword(s) Turbulence, Tidal energy, Wave, Doppler noise, ADCP, Alderney Race
Abstract

Velocity measurements collected by an upward-looking acoustic Doppler current profiler were used to provide the first study of ambient turbulence in Alderney Race. Turbulence metrics were estimated at mid-depth during peak flooding and ebbing tidal conditions. The dissipation rate ε and the integral lengthscale (L) were estimated using two independent methods: the spectral method and the structure function method. The spectral method provided ε and (L) estimates with standard deviations twice lower than that obtained from the structure function method. Removal of wave and Doppler noise-induced bias when estimating the dissipation rate was shown to be a crucial step in turbulence characterization. It allowed for a significant refining in (L) estimates derived from the spectral and structure function methods of 35 and 20 respectively. The integral lengthscale was found to be 2–3 times the local water depth. It is considered that these findings could be valuable for current turbine designers, helping them optimizing their designs as well as improving loading prediction through the lifetime of the machines.

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Thiébaut Maxime, Filipot Jean-Francois, Maisondieu Christophe, Damblans Guillaume, Duarte Rui, Droniou Eloi, Chaplain Nicolas, Guillou Sylvain (2020). A comprehensive assessment of turbulence at a tidal-stream energy site influenced by wind-generated ocean waves. Energy, 191, 116550 (12p.). Publisher's official version : https://doi.org/10.1016/j.energy.2019.116550 , Open Access version : https://archimer.ifremer.fr/doc/00592/70394/