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《Chinese Journal of Geophysics》 2012-01
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Acoustic wave dispersion and attenuation in marine sediment based on partially gas-saturated Biot-Stoll model

ZHU Zu-Yang1,WANG Dong1,ZHOU Jian-Ping2,WANG Xiu-Ming1 1 Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China 2 Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China  
Acoustic wave propagation in marine sediments is studied based on a partially gas-saturated Biot-Stoll model.The effects of frame loss and free gas in pore water on the velocities and attenuations of fast P-wave,slow P-wave and shear wave are discussed,and the results are also compared with those of the Biot theory.It is shown that both the viscous loss of fluid and the friction loss of frame have effects on acoustic wave dispersion and attenuation,and at low frequencies the attenuation is mainly caused by the frame loss,while at high frequencies the attenuation caused by frame loss is relatively small.Less gas in the pore water will lead to significant changes in velocity of the fast P-wave,and free gas can hardly lead to any changes in velocity of the slow P-wave at low frequencies,but lead to great changes in velocity of shear wave.The variation of gas content will lead to apparent changes in attenuation of the fast P-wave,but small changes in attenuations of the slow P-wave and shear wave.One sample of the sediment from Hangzhou Bay is measured using an ultrasonic experiment system,and the experiment velocities are in good agreement with those obtained with partially gas-saturated Biot-Stoll model.
【Fund】: 海洋公益性行业科研专项经费项目(200805005);; 国家自然科学基金(10674148)资助
【CateGory Index】: P736.21
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1 CAO Zhengliang~1 ZHANG Shuying~2 MA Zaitian~3 (1 State Key Laboratory of Oceanic Acoustics,Hangzhou Applied Acoustics Research Institute Hangzhou 310012) (2 East Sea Research Station,The Chinese Academy of Sciences Shanghai 200032) (3 School of Ocean and Earth Science,Tongji University Shanghai 200092);Comparison of reflections and interface scatterings from BICSQS model and Biot-Stoll model seafloors[J];Acta Acustica;2006-05
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