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Non-stationary regimes of surface gravity wave turbulence

We present the first detailed analysis of rising and decaying gravity wave turbulence (GWT) in water. The results show that emerging wave turbulence is characterized by two time scales – a short dynamical scale from nonlinear wave interactions and longer kinetic scale characterizing formation of a stationary state. An initial phase of the wave turbulence decay follows a power law, as expected, but at longer timescales we observed a surprising non-monotonic spectral mode of decay relating to resonant wave interactions. These are unique in studies of GWT and are more generally important for predicting the characteristic timescales of non-stationary turbulent regimes.