Accession Number:

ADA422568

Title:

Experimental Study of Sound Waves in Sandy Sediment

Descriptive Note:

Technical rept.

Corporate Author:

WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

2003-05-01

Pagination or Media Count:

117.0

Abstract:

This dissertation describes experiments intended to help understand the physics of sound compressional waves propagating through sandy sediments unconsolidated porous media. The theory using a lumped parameter model and measurements using a reflection ratio technique includes derivations and measurements of acoustic impedance, effective densities, wave speeds phase velocities, effective pressures, mode shapes, pressure reflection coefficients, and material moduli. The results show the acoustic impedance divided by the phase velocity, rendering an effective density, is less than the total density of the sediment effective density 89 plus or minus 3 of total. The results also show the fluid in the sediment oscillates back-and-forth 2.2 plus or minus 0.4 times farther than the sand in the sediment mode shape during the passing of a sound wave. These facts suggest the existence of Biot waves two compressional waves in water- saturated sand.

Subject Categories:

  • Soil Mechanics
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE