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- W2029687741 abstract "In an earlier study (Bouruet-Aubertot et al., J. Fluid Mech., 285: 265–301, 1995) the evolution of a large-scale, high-frequency, standing internal gravity wave was investigated by means of two-dimensional numerical computations. It was shown that breaking eventually occurs, whatever the wave amplitude. The instability mechanisms leading to breaking were analysed in detail. In the present paper, we study the strongly nonlinear regime resulting from wave breaking. Buoyancy and velocity variance spectra display a wavenumber range scaling as 0.2N2ky−3 and 0.1N2ky−3 respectively (N being the Brunt-Väisälä frequency and ky the vertical wavenumber). The buoyancy variance spectrum has the same power law and level as in a laboratory experiment performed on the same subject by Benielli and Sommeria (Dyn. Atmos. Oceans, 23: 335–343, 1996), and is very close to fine-scale oceanic temperature spectra. The buoyancy flux spectrum appears to be counter-gradient at small scales, confirming results from previously published numerical simulations. We propose a physical interpretation for this small-scale behaviour. Finally, the spectrum of the buoyancy flux is compared with the kinetic energy and buoyancy variance spectra, to quantify its role in energy transfers. This point is essential for deciding between the theories proposed to explain the ky spectral range, which is also observed in the stratosphere." @default.
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- W2029687741 date "1996-01-01" @default.
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- W2029687741 title "Stratified turbulence produced by internal wave breaking: two-dimensional numerical experiments" @default.
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- W2029687741 doi "https://doi.org/10.1016/0377-0265(95)00430-0" @default.
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