Nonlinear harmonic surface waves on a deep water. Experimental results in ?Marintek? ocean basin (Trondheim, Norway).

V.Efimov$^{1, 2}$, S. Ilic$^3$, J. Luxmoore$^3$, P.V.E. McClintock$^2$, I. Nygaard$^4$, C. Pakodzi$^4$, C.T.Stansberg$^4$

1. Institute of Solid State Physics RAS, Chernogolovka, Russia
2. Lancaster Environment Centre, Lancaster University, Lancaster, UK
3. Physics Department, Lancaster University, Lancaster, UK
4. MARINTEK, P.O. Box 4125 Valentinlyst, NO-7052, Trondheim, Norway

We studied propagation of one-dimensional harmonic waves with different amplitudes in Marintek Ocean Basin. Waves were investigated within the frequency range $0.4 ? 1~Hz$, for amplitudes $0.068 ? 0.2~ m$. The deep of the basin was $3~ m$. The main results were got for waves with $f=1~ Hz$ (wavelength $=1.56~ m$), so we worked mainly with waves on a deep water.
We observed formation of direct and inverse energy cascades at pumping of the system by single harmonic frequency high amplitude.
In the report we will discuss the Fourier spectrum of the initial harmonic waves and its evolution with time and distance, the formation of energy cascades, the interactions of two and three co-linear harmonic waves, and the influence of the noise on these interactions in the quasi-one-dimensional case.