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We study deep water ocean wind-driven waves in strait, with wind directedorthogonally to the shore, through exact Hasselmann equation. Despite of"dissipative" shores - we do not include any reflection from the coast lines -we show that the wave turbulence evolution can be split in time into twodifferent regimes. During the first wave propagate along the wind, and thewind-driven sea can be described by the self-similar solution of the Hasselmannequation like in the open sea. The second regime starts later in time, aftersignificant enough wave energy accumulation at the down-wind boundary. Sincethis moment the ensemble of waves propagating against the wind starts itsformation. Also, the waves, propagation along the strait start to appear. Thewave system eventually reaches asymptotic stationary state in time, consistingof two co-existing states: the first, self-similar wave ensemble, propagatingwith the wind, and the second, quasi-monochromatic waves, propagating almostorthogonal to the wind direction and tending to slant against the wind at theangle of 15 degrees closer to the wave turbulence origination shore line. These"secondary waves" appear only due to intensive nonlinear wave interaction. Thetotal wave energy exceeds its "expected value" approximately by the factor oftwo, with respect to estimated in the absence of the shores. It is expectedthat in the reflective shores presence this amplification will growessentially. We propose to call this laser-like Nonlinear Ocean WavesAmplification mechanism by the acronym NOWA.

Nonlinear Ocean Waves Amplification in Straits