Accession Number : AD0780898

Title :   Acoustics of Gas-Bearing Sediments,


Personal Author(s) : Anderson,Aubrey L.

Report Date : MAY 1974

Pagination or Media Count : 174

Abstract : Acoustical properties of water saturated and gassy sediments are observed to be significantly different. The present state of knowledge of the acoustical properties of saturated sediments, gassy water, and gassy sediments is reviewed. The dynamics of bubbles in water and in various solid materials, including sediments, are experimentally examined. Pulsation resonance is exhibited by the bubbles in all materials examined. Predictions of bubble resonance frequency and damping are shown to agree with the measurements. Equations for sound speed and attenuation, based on the model of resonating gas bubbles, are shown to agree with published measurements in gassy sediments. Parameters required for predicting gassy sediment acoustical properties are identified. Ranges of values of these parameters for various sediments are discussed. (Author)

Descriptors :   *Acoustic properties, *Sediments, *Gases, *Ocean bottom, *Underwater sound, Bubbles, Gas dynamics, Acoustic velocity, Acoustic attenuation, Sea water

Subject Categories : Physical and Dynamic Oceanography
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE