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Frequency dependencies of phase velocity and attenuation coefficient in a water-saturated sandy sediment from 0.3 to 1.0 MHz

Frequency dependencies of phase velocity and attenuation coefficient in a water-saturated sandy sediment from 0.3 to 1.0 MHz
Frequency dependencies of phase velocity and attenuation coefficient in a water-saturated sandy sediment from 0.3 to 1.0 MHz
The frequency-dependent phase velocity and attenuation coefficient for the fast longitudinal wave in a water-saturated sandy sediment were measured over the frequency range from 0.3 to 1.0 MHz. The experimental data of phase velocity exhibited the significant negative dispersion, with the mean rate of decline of 120±20 m/s/MHz. The Biot model predicted the approximately nondispersive phase velocity and the grain-shearing (GS) model exhibited the slightly positive dispersion. In contrast, the predictions of the multiple scattering models for the negative dispersion in the glass-grain composite were in general agreement with the experimental data for the water-saturated sandy sediment measured here. The experimental data of attenuation coefficient was found to increase nonlinearly with frequency from 0.3 to 1.0 MHz. However, both the Biot and the GS models yielded the attenuation coefficient increasing almost linearly with frequency. The total attenuation coefficient given by the algebraic sum of absorption and scattering components showed a reasonable agreement with the experimental data for overall frequencies. This study suggests that the scattering is the principal mechanism responsible for the variations of phase velocity and attenuation coefficient with frequency in water-saturated sandy sediments at high frequencies.
underwater sound, acoustic wave absorption, acoustic dispersion, acoustic wave scattering
0001-4966
2553-2558
Lee, Kang Il
de3f6e58-4a66-4778-83e3-1d5703325e87
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Kim, Byoung-Nam
75a45501-d47e-4c30-82f4-00067d977d90
Yoon, Suk Wang
6f61817c-44f3-4fe2-adee-62c4307edfa0
Lee, Kang Il
de3f6e58-4a66-4778-83e3-1d5703325e87
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Kim, Byoung-Nam
75a45501-d47e-4c30-82f4-00067d977d90
Yoon, Suk Wang
6f61817c-44f3-4fe2-adee-62c4307edfa0

Lee, Kang Il, Humphrey, Victor F., Kim, Byoung-Nam and Yoon, Suk Wang (2007) Frequency dependencies of phase velocity and attenuation coefficient in a water-saturated sandy sediment from 0.3 to 1.0 MHz. Journal of the Acoustical Society of America, 121 (5), 2553-2558. (doi:10.1121/1.2713690).

Record type: Article

Abstract

The frequency-dependent phase velocity and attenuation coefficient for the fast longitudinal wave in a water-saturated sandy sediment were measured over the frequency range from 0.3 to 1.0 MHz. The experimental data of phase velocity exhibited the significant negative dispersion, with the mean rate of decline of 120±20 m/s/MHz. The Biot model predicted the approximately nondispersive phase velocity and the grain-shearing (GS) model exhibited the slightly positive dispersion. In contrast, the predictions of the multiple scattering models for the negative dispersion in the glass-grain composite were in general agreement with the experimental data for the water-saturated sandy sediment measured here. The experimental data of attenuation coefficient was found to increase nonlinearly with frequency from 0.3 to 1.0 MHz. However, both the Biot and the GS models yielded the attenuation coefficient increasing almost linearly with frequency. The total attenuation coefficient given by the algebraic sum of absorption and scattering components showed a reasonable agreement with the experimental data for overall frequencies. This study suggests that the scattering is the principal mechanism responsible for the variations of phase velocity and attenuation coefficient with frequency in water-saturated sandy sediments at high frequencies.

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More information

Published date: May 2007
Keywords: underwater sound, acoustic wave absorption, acoustic dispersion, acoustic wave scattering

Identifiers

Local EPrints ID: 46554
URI: https://eprints.soton.ac.uk/id/eprint/46554
ISSN: 0001-4966
PURE UUID: c8ff85a9-b3ac-43bd-a5a4-f6d1c508a3d8
ORCID for Victor F. Humphrey: ORCID iD orcid.org/0000-0002-3580-5373

Catalogue record

Date deposited: 11 Jul 2007
Last modified: 14 Mar 2019 01:44

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