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J Acoust Soc Am. 2019 Mar;145(3):EL243. doi: 10.1121/1.5094667.

Robust estimation of sediment sound speed from the group speed of the critical mode.

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The Key Laboratory of Underwater Environment, Institute of Acoustics, Chinese Academy of Sciences, No.21 Bei Si Huan Xi Lu, Beijing 100190,,,,,
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8P 5C2,


In the ocean waveguide, the sediment sound speed has a simple relationship with the group speed of the highest order mode that propagates close to the critical angle. The paper shows that robust estimates of the sound speed are obtained from estimates of the "critical" mode group speed determined from analysis of the energy distribution of the time-warped spectrum of a broadband signal. The method is applied to experimental data collected in the Yellow Sea of China. Estimated sound speeds agreed closely with expected values for clayey slit (1531 m/s) and sandy silt (1593 m/s) sediment at the sites.


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