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Measurement of the Plane Wave Reflection Coefficient for the Saturated Granular Medium in the Water Tank and Comparison to Predictions by the Biot Theory  

Lee Keun-Hwa (서울대학교 공과대학 조선해양공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.25, no.5, 2006 , pp. 246-256 More about this Journal
Abstract
The plane wave reflection coefficient is an acoustic property containing all the information concerning the ocean bottom and can be used as an input parameter to various acoustic propagation models. In this paper, we measure the plane wave reflection coefficient, the sound speed, thd the attenuation for saturated granular medium in the water tank. Three kinds of glass beads and natural sand are used as the granular medium. The reflection experiment is performed with the sinusoidal tone bursts of 100 kHz at incident angles from 28 to 53 degrees, and the sound speed and attenuation experiment are performed also with the same signal. From the measured reflection signal, the reflection coefficient is calculated with the self calibration method and the experimental uncertainties are discussed. The sound speed and the attenuation measurements are used for the estimation of the porosity and permeability, the main Biot parameters. The estimated values are compared to the directly measured values and used as input values to the Biot theory in order to calculate the theoretical reflection coefficient. Finally, the reflection coefficient predicted by Biot theory is compared to the measured reflection coefficient and their characteristics are discussed.
Keywords
Plane wave reflection coefficient; Biot theory; Self calibration method; Estimation of biot parameters;
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