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Saturation of the inverse cascade in surface gravity-wave turbulence

Abstract : We report on the observation of surface gravity-wave turbulence at scales larger than the forcing ones in a large basin. In addition to the downscale transfer usually reported in gravity-wave turbulence, an upscale transfer is observed, interpreted as the inverse cascade of weak turbulence theory. A steady state is achieved when the inverse cascade reaches a scale in between the forcing wavelength and the basin size, but far from the latter. This inverse cascade saturation, which depends on the wave steepness, is probably due to the emergence of nonlinear dissipative structures such as sharp-crested waves.
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https://hal.archives-ouvertes.fr/hal-02915810
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Submitted on : Sunday, August 16, 2020 - 12:10:38 PM
Last modification on : Sunday, October 18, 2020 - 3:48:04 PM

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Eric Falcon, Guillaume Michel, Gaurav Prabhudesai, Annette Cazaubiel, Michaël Berhanu, et al.. Saturation of the inverse cascade in surface gravity-wave turbulence. Physical Review Letters, American Physical Society, 2020, 125, pp.134501. ⟨10.1103/PhysRevLett.125.134501⟩. ⟨hal-02915810⟩

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