Accession Number : ADA324237

Title :   Effects of Shear Elasticity on Sea Bed Scattering: Numerical Examples.

Descriptive Note : Final rept. 24 Oct 94-30 Nov 96,

Corporate Author : WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB

Personal Author(s) : Ivakin, Anatoliy N. ; Jackson, Darrell R.

PDF Url : ADA324237

Report Date : 16 AUG 1996

Pagination or Media Count : 37

Abstract : It is known that marine sediments can support both compressional and shear waves. However, published work on scattering from irregular elastic media has not examined the influence of shear on sea bed scattering in detail. A perturbation model previously developed by the authors for joint roughness volume scattering is used to study the effects of elasticity for three sea bed types: sedimentary rock, sand with high shear speed, and sand with normal shear wave speed. Both bistatic and monostatic cases are considered. For sedimentary rock it is found that shear elasticity tends to increase the importance of volume scattering and decrease the importance of roughness scattering relative to the fluid case. Shear effects are shown to be small for sands.

Descriptors :   *PERTURBATION THEORY, *ACOUSTIC SCATTERING, *OCEAN BOTTOM, HIGH FREQUENCY, ACOUSTIC WAVES, SURFACE ROUGHNESS, SAND, BACKSCATTERING, PERTURBATIONS, ACOUSTIC ABSORPTION, UNDERWATER ACOUSTICS, SEDIMENTS, ELASTIC WAVES, SECONDARY WAVES, BORN APPROXIMATIONS, SEDIMENTARY ROCK, COMPRESSION WAVES.

Subject Categories : Acoustics
      Operations Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE