Compressional wave speed and absorption measurements in a saturated kaolinite-water artificial sediment.
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Authors
Martinek, Charles Allen
Subjects
viscoelastic
acoustics
absorption
sediment
rigidity
acoustics
absorption
sediment
rigidity
Advisors
Andrews, Robert S.
Wilson, O.B. Jr.
Date of Issue
1972-03
Date
March 1972
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
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, V . 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.
Type
Thesis
Description
Series/Report No
Department
Oceanography
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.