Acoustic fields in the ocean bottom

A strict solution of the Helmholtz's nonuniform equation in the form of the Green's function for two liquid media with an arbitrary geometry of the boundaries has been obtained. Examples of the calculation of the two- and three-element array, located in the confined space, bounded by the three finite impedance planes are cited. The decrease of the velocity of the refracted waves at the bottom-side half-space has been proved to take place when the incidence of the centrally symmetric waves (e.g. cylindrical and spherical waves) to the flat boundary of the two liquid media is under the angles greater than the critical ones.