Accession Number : ADA310882

Title :   Backscatter Analysis from a Smooth Sand Surface: Diffusion Approximation.

Descriptive Note : Final rept. 21 Jun 94-30 Jun 95,

Corporate Author : TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS

Personal Author(s) : Chotiros, Nicholas P. ; Mautner, Adrienne M. ; Laughlin, Julia

PDF Url : ADA310882

Report Date : 26 OCT 1995

Pagination or Media Count : 46

Abstract : The development of a model of backscatter from a smooth underwater sediment surface is described. The model includes two components: the propagation of acoustic energy through the water/sediment interface which is governed by wave theory, and randomization of acoustic energy within the interior of the sediment which is approximated by the diffusion equation. With respect to the wave theory, Biot's poroelastic wave propagation theory is used. The model gives predictions of acoustic backscattering strength as a function of grazing angle, grain size, and energy decay rates that can be matched to experimental data.

Descriptors :   *BACKSCATTERING, *ACOUSTIC SCATTERING, *SEDIMENTS, MATHEMATICAL MODELS, ACOUSTIC WAVES, PROBABILITY DISTRIBUTION FUNCTIONS, SHEAR MODULUS, GRAIN SIZE, SAND, POWER SPECTRA, WAVE PROPAGATION, APPROXIMATION(MATHEMATICS), ACOUSTIC MEASUREMENT, ACOUSTIC SIGNALS, DIFFUSION, ACOUSTIC ATTENUATION, UNDERWATER ACOUSTICS, OCEAN BOTTOM TOPOGRAPHY, PLANE WAVES, GRAZING ANGLES.

Subject Categories : Acoustics
      Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE