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:

1966-09-12

Pagination or Media Count:

18.0

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