Aubourg Quentin, Mordant Nicolas
Université Grenoble Alpes, LEGI, CNRS, F-38000 Grenoble, France and Institut Universitaire de France, 103, Boulevard Saint Michel, F-75005 Paris, France.
Phys Rev Lett. 2015 Apr 10;114(14):144501. doi: 10.1103/PhysRevLett.114.144501. Epub 2015 Apr 6.
We report a laboratory investigation of weak turbulence of water surface waves in the gravity-capillary crossover. By using time-space-resolved profilometry and a bicoherence analysis, we observe that the nonlinear processes involve three-wave resonant interactions. By studying the solutions of the resonance conditions, we show that the nonlinear interaction is dominantly one dimensional and involves collinear wave vectors. Furthermore, taking into account the spectral widening due to weak nonlinearity explains why nonlocal interactions are possible between a gravity wave and high-frequency capillary ones. We observe also that nonlinear three-wave coupling is possible among gravity waves, and we raise the question of the relevance of this mechanism for oceanic waves.
我们报告了一项关于重力 - 毛细交叉区域水面波弱湍流的实验室研究。通过使用时空分辨轮廓测量法和双相干分析，我们观察到非线性过程涉及三波共振相互作用。通过研究共振条件的解，我们表明非线性相互作用主要是一维的，并且涉及共线波矢。此外，考虑到弱非线性导致的频谱展宽，解释了重力波与高频毛细波之间为何可能存在非局部相互作用。我们还观察到重力波之间可能存在非线性三波耦合，并提出了这种机制与海浪相关性的问题。
