This paper describes the phenomenon of cancellation of opposing acoustic energy flows observed in an oceanic waveguide. One of the flows is a vertical (or horizontal) energy flow of dynamic underwater ambient noise, and the other (opposing) one is a vertical (or horizontal) energy flow from a local source. Results of a field experiment in the deep ocean are presented which show that the above-mentioned phenomenon leads to the destruction of coherence between the vertical and horizontal components of the particle velocity and pressure.

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In this paper, results of investigations of underwater ambient noise are presented based on statistical analysis of the acoustic pressure and three orthogonal components of particle velocity of a medium P(t), Vx(t), Vy(t), Vz(t). The mathematical analysis used includes cross-spectral characteristics, simple coherence functions, phase spectra, and an algorithm to split the noise field into anisotropic and isotropic fields. The above approach is applied to study the anisotropic and isotropic fields of ambient noise in the deep open ocean and in a coastal area. A fundamental feature of the anisotropic field that has been revealed is that the direction of the horizontal component of dynamic noise energy flux is similar to the surface roughness propagation direction.

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