Data/hora: 10/06/2024 06:42:18

Provedor de dados: | 5
País: | France
Título: | Three-wave and four-wave interactions in gravity wave turbulence
Autores: | Aubourg, Quentin; Campagne, Antoine; Peureux, Charles; Ardhuin, Fabrice; Sommeria, Joel; Viboud, Samuel; Mordant, Nicolas.
Data: | 2017-11
Ano: | 2017
Resumo: | Weak-turbulence theory is a statistical framework to describe a large ensemble of nonlinearly interacting waves. The archetypal example of such system is the ocean surface that is made of interacting surface gravity waves. Here we describe a laboratory experiment dedicated to probe the statistical properties of turbulent gravity waves. We set up an isotropic state of interacting gravity waves in the Coriolis facility (13-m-diam circular wave tank) by exciting waves at 1 Hz by wedge wave makers. We implement a stereoscopic technique to obtain a measurement of the surface elevation that is resolved in both space and time. Fourier analysis shows that the laboratory spectra are systematically steeper than the theoretical predictions and the field observations in the Black Sea by Leckler et al. [F. Leckler et al., J. Phys. Oceanogr. 45, 2484 (2015)]. We identify a strong impact of surface dissipation on the scaling of the Fourier spectrum at the scales that are accessible in the experiments. We use bicoherence and tricoherence statistical tools in frequency and/or wave-vector space to identify the active nonlinear coupling. These analyses are also performed on the field data by Leckler et al. for comparison with the laboratory data. Three-wave coupling is characterized by and shown to involve mostly quasiresonances of waves with second- or higher-order harmonics. Four-wave coupling is not observed in the laboratory but is evidenced in the field data. We discuss temporal scale separation to explain our observations.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00410/52141/52852.pdf

DOI:10.1103/PhysRevFluids.2.114802

http://archimer.ifremer.fr/doc/00410/52141/

Editor: | Amer Physical Soc
Relação: | info:eu-repo/grantAgreement/EC/FP7/647018/EU//WATU
Formato: | application/pdf
Fonte: | Physical Review Fluids (2469-990X) (Amer Physical Soc), 2017-11 , Vol. 2 , N. 11 , P. 114802 (1-19)

Fonte:

2017 American Physical Society

info:eu-repo/semantics/openAccess

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