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Frequency dependence of acoustic waves in marine sediments

Frequency dependence of acoustic waves in marine sediments
Frequency dependence of acoustic waves in marine sediments
In situ techniques provide the most reliable method of examining the geoacoustical properties of marine sediments. In the past, individual in situ surveys have only been able to examine compressional waves over a maximum frequency range of 100 Hz to 50 kHz. A new in situ acoustic device, the Sediment Probing Acoustic Detection Equipment, or SPADE, has been developed, which can emit a variety of pulses, e.g. tonal and swept-frequency, over a continuous frequency range of 10 - 100 kHz. Data from a recent field trial are analysed to obtain the in situ velocity and attenuation over frequency increments of 5 kHz between 10 - 75 kHz. Results imply that scattering is a dominant attenuation mechanism from 10-75 kHz and the media is dispersive for frequencies between 60 and 70 kHz and below 20 kHz. Biot theory cannot accurately model the observed velocity and attenuation.
43-49
Robb, G.
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Best, A.I.
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Dix, J.K.
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Leighton, T.G.
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Harris, A.
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Riggs, J.S.
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Bull, J.M.
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White, P.R.
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Stepnowski, A.
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Salamon, R.
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Partyka, A.
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Robb, G.
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Best, A.I.
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Dix, J.K.
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Leighton, T.G.
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Harris, A.
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Riggs, J.S.
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Bull, J.M.
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White, P.R.
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Stepnowski, A.
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Salamon, R.
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Partyka, A.
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Robb, G., Best, A.I., Dix, J.K., Leighton, T.G., Harris, A., Riggs, J.S., Bull, J.M. and White, P.R. (2002) Frequency dependence of acoustic waves in marine sediments. Stepnowski, A., Salamon, R. and Partyka, A. (eds.) Proceedings of the Sixth European Conference on Underwater Acoustics, Gdansk, Poland. 23 - 26 Jun 2002. pp. 43-49 .

Record type: Conference or Workshop Item (Paper)

Abstract

In situ techniques provide the most reliable method of examining the geoacoustical properties of marine sediments. In the past, individual in situ surveys have only been able to examine compressional waves over a maximum frequency range of 100 Hz to 50 kHz. A new in situ acoustic device, the Sediment Probing Acoustic Detection Equipment, or SPADE, has been developed, which can emit a variety of pulses, e.g. tonal and swept-frequency, over a continuous frequency range of 10 - 100 kHz. Data from a recent field trial are analysed to obtain the in situ velocity and attenuation over frequency increments of 5 kHz between 10 - 75 kHz. Results imply that scattering is a dominant attenuation mechanism from 10-75 kHz and the media is dispersive for frequencies between 60 and 70 kHz and below 20 kHz. Biot theory cannot accurately model the observed velocity and attenuation.

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More information

Published date: 2002
Venue - Dates: Proceedings of the Sixth European Conference on Underwater Acoustics, Gdansk, Poland, 2002-06-23 - 2002-06-26

Identifiers

Local EPrints ID: 10287
URI: http://eprints.soton.ac.uk/id/eprint/10287
PURE UUID: f4ce6b75-2741-45bd-8c77-ebd05a8da45a
ORCID for T.G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750
ORCID for P.R. White: ORCID iD orcid.org/0000-0002-4787-8713

Catalogue record

Date deposited: 01 Jul 2005
Last modified: 20 Nov 2021 02:37

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Contributors

Author: G. Robb
Author: A.I. Best
Author: J.K. Dix
Author: T.G. Leighton ORCID iD
Author: A. Harris
Author: J.S. Riggs
Author: J.M. Bull
Author: P.R. White ORCID iD
Editor: A. Stepnowski
Editor: R. Salamon
Editor: A. Partyka

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