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.

中文翻译：

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表面重力波湍流中反叶栅的饱和度

我们报告了在大盆地中观测到的地表重力波湍流的尺度大于强迫尺度。除了通常在重力波湍流中报道的向下尺度转移外，还观察到了向上尺度转移，这被解释为弱湍流理论的逆级联。当逆级联达到强迫波长和盆地尺寸之间的标度，但与后者相差甚远时，便达到稳态。取决于波陡度的逆级联饱和可能是由于非线性耗散结构（如尖顶波）的出现而引起的。