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We consider interactions between surface and interfacial waves in the twolayer system. Our approach is based on the Hamiltonian structure of theequations of motion, and includes the general procedure for diagonalization ofthe quadratic part of the Hamiltonian. Such diagonalization allows us to derivethe interaction crossection between surface and interfacial waves and to derivethe coupled kinetic equations describing spectral energy transfers in thissystem. Our kinetic equation allows resonant and near resonant interactions. Wefind that the energy transfers are dominated by the class III resonances of\cite{Alam}. We apply our formalism to calculate the rate of growth forinterfacial waves for different values of the wind velocity. Using our kineticequation, we also consider the energy transfer from the wind generated surfacewaves to interfacial waves for the case when the spectrum of the surface wavesis given by the JONSWAP spectrum and interfacial waves are initially absent. Wefind that such energy transfer can occur along a timescale of hours; there is arange of wind speeds for the most effective energy transfer at approximatelythe wind speed corresponding to white capping of the sea. Furthermore,interfacial waves oblique to the direction of the wind are also generated.

Excitation of interfacial waves via near---resonant surface---interfacial wave interactions