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Acoustics and Gas in Sediments: Applied Research Laboratories (ARL) Experience

  • Loyd D. Hampton
  • Aubrey L. Anderson
Part of the Marine Science book series (MR, volume 3)

Abstract

A discussion of the acoustical properties of saturated sediments and of gas bubbles in water is given as background to a discussion of the present state of knowledge of the acoustical properties of gas bearing sediments.

Four Applied Research Laboratories (ARL) programs are discussed, which have the commonality of gas in sediments, and which relate more or less directly to acoustic behavior. The first program is a series of laboratory measurements of the acoustic properties of constructed and controlled sediments. During these measurements, it became obvious that presence of gas dominated the acoustic behavior. The next program includes development of a chemical model of a gassy sediment and the design and construction of a diver operated sampler for collecting uncontaminated gas samples from a gassy sediment.

The third program is the development of a method for measuring sound speed during sediment coring. The cutting head of the coring barrel is modified to include two transducers and sound speed is recorded as the core barrel penetrates the sediment. The fourth program is an expansion of the sound speed measurement to include both attenuation (by amplitude measurement) and acoustic volume scattering (by use of an additional receiver at a right angle to the primary acoustic path). As the scattering mechanism is different for liquid saturated and gas bearing sediments, this technique should also be useful for indicating the presence of gas.

Keywords

Bottom Sediment Sound Speed Acoustical Property Automatic Gain Control Acoustical Attenuation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  • Loyd D. Hampton
    • 1
  • Aubrey L. Anderson
    • 1
  1. 1.Applied Research LaboratoriesThe University of Texas at AustinAustinUSA

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