Accession Number : AD0656549

Title :   SCATTERING FROM TIME-VARYING ROUGH SURFACES.

Descriptive Note : Technical rept.,

Corporate Author : BELL TELEPHONE LABS INC WHIPPANY N J

Personal Author(s) : Parkins,B. E.

Report Date : 12 SEP 1966

Pagination or Media Count : 18

Abstract : The fading of a monochromatic acoustic plane wave, reradiated by a moving, rough surface, is described using the far-zone spectral density of the reradiated pressure. This quantity is calculated using the method of physical optics, and specialized to the cases of slightly rough and very rough wind-generated seas, which are described by the Neumann-Pierson directional wave spectrum. The results show the dependence of the radiation spectrum upon wind speed, and the angles of incidence and observation relative to the wind direction. (Author)

Descriptors :   (*ACOUSTIC SIGNALS, SCATTERING), (*SURFACES, ACOUSTIC PROPERTIES), RANDOM VARIABLES, ATTENUATION, SURFACE PROPERTIES, SURFACE ROUGHNESS, WAVE PROPAGATION, MATHEMATICAL ANALYSIS, WIND, OCEAN WAVES

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE