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VOLUME 97 | ISSUE 8 | PAGE 529
Non-stationary regimes of surface gravity wave turbulence
We present experimental results about rising and decaying gravity wave turbulence in a large laboratory flume. We consider the time evolution of the wave energy spectral components in ω- and k-domains and demonstrate that emerging wave turbulence can be characterized by two time scales - a short dynamical scale due to nonlinear wave interactions and a longer kinetic time scale characterising formation of a stationary wave energy spectrum. In the decay regime we observed the maximum of the wave energy spectrum decreasing in time initially as the power law, \propto t^{-1/2}, as predicted by the weak turbulence theory, and then exponentially due to viscous friction.