Simulation of wave transmission and reception with phased arrays near the sea shelf bottom

The wave field excited by both single sources and a vertically directed phased transmitting array in a shallow-water waveguide with a layered elastic bottom is numerically simulated. The receivers are equispaced vertical arrays with different apertures, which are positioned at different depths in the water layer. The type of vertical distribution and the transformation of the vertical angular spectrum of pulsed signals arriving at a receiving array are demonstrated for different parameters of the medium, different carrier frequencies, and different distances from the source. It is shown that a selective angular reception ensures a better resolution of the travel-time curves of waves used for sounding the bottom. As an example, the possibility of singling out the shear wave refracted by a deep-seated bottom layer from the tone pattern of the travel-time curves is demonstrated. This possibility can be realized by means of angular scanning in the course of transmission and reception with the use of vertically oriented arrays.