The Use of Spectral Decomposition in Determining the Plane Wave Spectrum of the Incident Acoustic Field on a Rough Sea Surface.
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
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One hybrid approach to studying the effects of scattering from a rough sea surface on acoustic transmission in a waveguide makes use of a description of the incident acoustic field in terms of its plane wave spectrum PWS. This is a convenient form because many scattering models assume plane wave incidence. In this paper, an expression for the PWS of the acoustic field incident on a flat sea surface is developed from a spectral decomposition of the depth coordinate operator and a source term provided by a finite element parabolic equation FEPE model. Previously, the spectral decomposition method was used to couple the scattering from a spherical target in free space to an ocean waveguide. Details of the coupling between the propagation and scattering model are presented. A numerical experiment is considered In which the PWS Is used to develop input to a wedge assemblage WA scattering model in order to simulate a canonical one convergence zone backscatter experiment.