Accession Number : AD0742928

Title :   Compressional Wave Speed and Absorption Measurements in a Saturated Kaolinite-Water Artificial Sediment.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Martinek,Charles Allen

Report Date : MAR 1972

Pagination or Media Count : 40

Abstract : The absorption coefficient for compressional waves in a water-saturated, kaolinite clay was measured in the frequency range 100 to 150 kHz using a pulse technique with spherically diverging waves. The measurement also permitted determination of the sound speed, Vp. For one condition of the clay with a 77% porosity, the sound speed was 1422 m/sec. The absorption coefficient, a, was found to be frequency dependent, satisfying the empirical relationship a = 0.033 f dB/m, f being the frequency in kHz. No dispersion of wave speed with frequency was observed. These results were used together with the results of dynamic shear (rigidity) modulus measurements made with a torsional wave viscoelastometer to calculate the complex Lame constants of a viscoelastic model. (Author)

Descriptors :   (*OCEAN BOTTOM, ULTRASONIC PROPERTIES), (*UNDERWATER SOUND, SOUND TRANSMISSION), KAOLINITE, ABSORPTION, COMPRESSIVE PROPERTIES, POROSITY, VELOCITY, VISCOELASTICITY, MATHEMATICAL MODELS, THESES, SEDIMENTATION

Subject Categories : Physical and Dynamic Oceanography
      Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE