Mean intensity and the space-frequency coherence of a sound field scattered by internal waves in deep ocean

Results of numerical simulations of the energy and correlation characterist ics of a multimode acoustic signal propagating in a deep-water oceanic wave guide in the presence of internal waves are presented. The effect of multip le scattering on the depth-dependent mean intensity of sound field is found to be weak, excluding the regions near the depth of the source and the rec iprocal depth. In these regions, the initial intensity peaks diminish with distance from the source. On the contrary, the correlation function of an a coustic signal is noticeably affected by random inhomogeneities in the ocea nic medium, and this effect causes a coherence loss that increases with the carrier frequency and the distance from the source.