Accession Number:

ADA277583

Title:

Bottom Backscatter from Trapped Bubbles

Descriptive Note:

Final rept. 23 Dec 1991-31 Dec 1992

Corporate Author:

TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS

Report Date:

1993-07-30

Pagination or Media Count:

58.0

Abstract:

A model for acoustic backscatter from gas bubbles in sediment has been developed. It computes the backscattering strength of a gassy sediment, given a spherical source in the water column above. A Biot model for acoustic penetration into the sediment is incorporated. The computed backscattering strength is that of a spatial distribution of trapped bubbles. The bubble size distribution is assumed to mirror the pore size distribution. An approximate pore size distribution is estimated from the measured grain size distribution and studies of dense random packings of hard spheres. Backscatter, Bubble size distribution, Pore pressure, reciprocity Biot, Gassy sediment, Porous medium, sediment Bubble, Plane wave decomposition, Scattering cross section.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Acoustics
  • Optics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE