Accession Number : ADA135712

Title :   Experimental Design for the Measurement of Acoustic Parameters of Marine Sediments Containing Gas Hydrates.

Descriptive Note : Technical rept.,


Personal Author(s) : Daniels,J M ; Vidmar,P J

PDF Url : ADA135712

Report Date : 03 Oct 1983

Pagination or Media Count : 30

Abstract : In FY82, Applied Research Laboratories, The University of Texas at Austin, designed an apparatus and developed an experimental plan to measure acoustic parameters of hydrated sediments under controlled laboratory conditions. The emphasis is on obtaining values for shear wave velocity and the attenuation coefficients of both shear and compressional waves. The apparatus will consist of an acrylic vessel designed to contain sediments and gases under conditions of sufficiently high pressure and sufficiently low temperature to form gas hydrate crystals. The vessel can be easily modified to accept a variety of transducers for measuring the acoustical, thermal, and electrical properties of hydrated marine sediments. The experimental plan calls for three phases. In the first, the basic apparatus will be constructed and the most difficult aspect of the experiment, actually growing hydrates in sediments, will be perfected. In the second phase, modifications suggested during the first phase will be implemented, transducers for acoustical measurements will be added, and the initial measurements of the acoustical measurements will be taken in which the sediment type, pressure-temperature conditions, and hydrate concentrations will be varied over a wide range in order to determine their influence on the acoustic parameters. (Author)

Descriptors :   *Sediments, *Acoustic velocity, *Hydrates, Crystal growth, Attenuation, Acoustic properties, Natural gas, Saturation, High pressure, Ocean bottom, Substrates, Chemical oceanography, Simulation, Shear properties, Compressive properties, Experimental design, Laboratory procedures, Geoacoustics

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE