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Use of dual methods to infer methane bubble populations in gassy sediments: inversion of combination-frequency data

Use of dual methods to infer methane bubble populations in gassy sediments: inversion of combination-frequency data
Use of dual methods to infer methane bubble populations in gassy sediments: inversion of combination-frequency data
Bubbles can dramatically change the acoustic properties of their host medium even if they are present in very small amounts. This paper describes the combination-frequency component of tank and field measurements taken using a device which measures bubbles in marine sediments using multiple acoustic techniques (allowing the results of the various techniques to be compared). The combination-frequency method uses the nonlinear scattering property of bubbles when insonified by two primary frequencies. For low void fractions, there is a monotonic relationship between the scattered field and the population of bubbles resonant at either of the primary frequencies or combination of these and-slash or their subharmonics. This principle is used to infer the bubble size distribution. In contrast to the case of gas bubbles in water, in marine sediments the shear properties of the host medium must be incorporated into the model for the bubble dynamics and a new model for this is presented. This model is then inverted to obtain the bubble size distribution. The predictions of this method were compared with the method of inversion of propagation data (detailed in a companion paper), obtained from in situ experiments on the South coast of England. ©2008 Acoustical Society of America
0001-4966
3350
Mantouka, Agni
5cf325f2-3311-477a-b180-460e8724356e
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Robb, Gary B.
4e68f901-1f98-4953-977b-cbfcbdb8bb1e
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Dix, Justin K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Klusek, Zigmunt
3871a049-f7d3-4112-a2f5-4616ae8ee409
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Mantouka, Agni
5cf325f2-3311-477a-b180-460e8724356e
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Robb, Gary B.
4e68f901-1f98-4953-977b-cbfcbdb8bb1e
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Dix, Justin K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Klusek, Zigmunt
3871a049-f7d3-4112-a2f5-4616ae8ee409
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba

Mantouka, Agni, Leighton, Timothy G., Robb, Gary B., Best, Angus I., Dix, Justin K., Klusek, Zigmunt and White, Paul R. (2008) Use of dual methods to infer methane bubble populations in gassy sediments: inversion of combination-frequency data. Journal of the Acoustical Society of America, 123 (5), 3350. (doi:10.1121/1.2933912).

Record type: Article

Abstract

Bubbles can dramatically change the acoustic properties of their host medium even if they are present in very small amounts. This paper describes the combination-frequency component of tank and field measurements taken using a device which measures bubbles in marine sediments using multiple acoustic techniques (allowing the results of the various techniques to be compared). The combination-frequency method uses the nonlinear scattering property of bubbles when insonified by two primary frequencies. For low void fractions, there is a monotonic relationship between the scattered field and the population of bubbles resonant at either of the primary frequencies or combination of these and-slash or their subharmonics. This principle is used to infer the bubble size distribution. In contrast to the case of gas bubbles in water, in marine sediments the shear properties of the host medium must be incorporated into the model for the bubble dynamics and a new model for this is presented. This model is then inverted to obtain the bubble size distribution. The predictions of this method were compared with the method of inversion of propagation data (detailed in a companion paper), obtained from in situ experiments on the South coast of England. ©2008 Acoustical Society of America

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Published date: May 2008

Identifiers

Local EPrints ID: 57845
URI: https://eprints.soton.ac.uk/id/eprint/57845
ISSN: 0001-4966
PURE UUID: 84839bae-9cea-4b2b-9c21-f072d2eb5b17
ORCID for Timothy G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750
ORCID for Paul R. White: ORCID iD orcid.org/0000-0002-4787-8713

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Date deposited: 20 Aug 2008
Last modified: 14 Mar 2019 01:54

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Contributors

Author: Agni Mantouka
Author: Gary B. Robb
Author: Angus I. Best
Author: Justin K. Dix
Author: Zigmunt Klusek
Author: Paul R. White ORCID iD

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