Inferring bubble populations in intertidal sediments from attenuation and scattering measurements
Inferring bubble populations in intertidal sediments from attenuation and scattering measurements
The presence of gas and gas bubbles, and their effects on the geoacoustic properties of sediments, have being the topics of many investigations. In the case of cohesive gassy sediments, the shape of the gas in the host medium has also been seen as important. In many cases the gas in muds appears to form cracks or take the form of oblate spheroids. However to make theory of the acoustic interactions tractable, they are often assumed to be spherical. In this paper, acoustic propagation and backscattering measurements are interpreted in order to infer shape information of gas inclusions (e.g. slabs, cracks or spheroids) The measurements were carried out at intertidal sites on the South coast of England. The bubble population was estimated from backscattering measurements using a nonlinear bubble dynamics inversion method. This method assumes the presence of spherical bubbles only and uses a 'mixed-frequency' insonification which limits ambiguities in interpretation of the measurements. Then the computed bubble population is converted to attenuation values. These attenuation values are compared to attenuation values obtained from the propagation measurements in order to compare the two methods and speculate the sphericity of the bubbles present.
733-738
Institute of Applied & Computational Mathematics
Mantouka, A.
64ac7532-5efe-404b-9045-256ea6f2dd50
Leighton, T.G.
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Best, A.I.
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Dix, J.K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
White, P.R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
2009
Mantouka, A.
64ac7532-5efe-404b-9045-256ea6f2dd50
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Best, A.I.
cad03726-10f8-4f90-a3ba-5031665234c9
Dix, J.K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
White, P.R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Mantouka, A., Leighton, T.G., Best, A.I., Dix, J.K. and White, P.R.
(2009)
Inferring bubble populations in intertidal sediments from attenuation and scattering measurements.
Papdakis, J.S. and Bjorno, L.
(eds.)
In Proceedings of the 3rd International Conference on Underwater Acoustic Measurements, Technologies and Results.
Institute of Applied & Computational Mathematics.
.
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Conference or Workshop Item
(Paper)
Abstract
The presence of gas and gas bubbles, and their effects on the geoacoustic properties of sediments, have being the topics of many investigations. In the case of cohesive gassy sediments, the shape of the gas in the host medium has also been seen as important. In many cases the gas in muds appears to form cracks or take the form of oblate spheroids. However to make theory of the acoustic interactions tractable, they are often assumed to be spherical. In this paper, acoustic propagation and backscattering measurements are interpreted in order to infer shape information of gas inclusions (e.g. slabs, cracks or spheroids) The measurements were carried out at intertidal sites on the South coast of England. The bubble population was estimated from backscattering measurements using a nonlinear bubble dynamics inversion method. This method assumes the presence of spherical bubbles only and uses a 'mixed-frequency' insonification which limits ambiguities in interpretation of the measurements. Then the computed bubble population is converted to attenuation values. These attenuation values are compared to attenuation values obtained from the propagation measurements in order to compare the two methods and speculate the sphericity of the bubbles present.
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Published date: 2009
Venue - Dates:
Third International Conference on Underwater Acoustic Measurements, Technologies and Results, Nafplion, Greece, 2009-06-21 - 2009-06-26
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Local EPrints ID: 71444
URI: http://eprints.soton.ac.uk/id/eprint/71444
PURE UUID: 7b23be12-73f4-498b-84ce-f38a5351e3bd
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Date deposited: 02 Feb 2010
Last modified: 14 Mar 2024 02:37
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Contributors
Author:
A. Mantouka
Author:
A.I. Best
Editor:
J.S. Papdakis
Editor:
L. Bjorno
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