Assessing the turbulent kinetic energy budget in an energetic tidal flow from measurements of coupled ADCPs

Type Article
Date 2020-08
Language English
Author(s) Thiebaut Maxime1, Filipot Jean-Francois1, Maisondieu ChristopheORCID2, Damblans Guillaume1, Duarte Rui1, Droniou Eloi3, Guillou Sylvain4
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 : Normandie Univ, UNICAEN, LUSAC, EA4253, site universitaire de Cherbourg, rue Louis Aragon, BP 78, 50130, Cherbourg-Octeville France
Source Philosophical Transactions Of The Royal Society A-mathematical Physical And Engineering Sciences (1364-503X) (Royal Society of London), 2020-08 , Vol. 378 , N. 2178 , P. 20190496 (21p.)
DOI 10.1098/rsta.2019.0496
WOS© Times Cited 6
Keyword(s) turbulence, Reynolds stresses, coupled ADCPs, Alderney Race
Abstract

Two coupled four-beam acoustic Doppler current profilers were used to provide simultaneous and independent measurements of the turbulent kinetic energy (TKE) dissipation rate ε and the TKE production rate P over a 36 h long period at a highly energetic tidal energy site in the Alderney Race. The eight-beam arrangement enabled the evaluation of the six components of the Reynolds stress tensor which allows for an improved estimation of the TKE production rate. Depth-time series of ε, P and the Reynolds stresses are provided. The comparison between ε and P was performed by calculating individual ratios of ε corresponding to P. The depth-averaged ratio ε/P averaged over whole flood and ebb tide were found to be 2.2 and 2.8 respectively, indicating that TKE dissipation exceeds TKE production. It is shown that the term of diffusive transport of TKE is significant. As a result, non-local transport is important to the TKE budget and the common assumption of a local balance, i.e. a balance between production and dissipation, is not valid at the measurement site.

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Thiebaut Maxime, Filipot Jean-Francois, Maisondieu Christophe, Damblans Guillaume, Duarte Rui, Droniou Eloi, Guillou Sylvain (2020). Assessing the turbulent kinetic energy budget in an energetic tidal flow from measurements of coupled ADCPs. Philosophical Transactions Of The Royal Society A-mathematical Physical And Engineering Sciences, 378(2178), 20190496 (21p.). Publisher's official version : https://doi.org/10.1098/rsta.2019.0496 , Open Access version : https://archimer.ifremer.fr/doc/00642/75432/