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Acoustic propagation in gassy intertidal marine sediments: an experimental study

Acoustic propagation in gassy intertidal marine sediments: an experimental study
Acoustic propagation in gassy intertidal marine sediments: an experimental study
The need to predict acoustic propagation through marine sediments that contain gas bubbles has become increasingly important for civil engineering and climate studies. There are relatively few in situ acoustic wave propagation studies of muddy intertidal sediments, in which bubbles of biogenic gas (generally methane, a potent greenhouse gas) are commonly found. We used a single experimental rig to conduct two in situ intertidal acoustical experiments to improve understanding of acoustic remote sensing of gassy sediments, eventually including gas bubble size distributions. In the first experiment, we measured sediment sound speed and attenuation between four aligned hydrophones for a quasi-plane wave propagating along the array. The second experiment involved a focused insonified sediment volume created by two transducers emitting coincident sound beams at different frequencies that generated bubble-mediated acoustic signals at combination frequencies. The results from sediment core analyses, and comparison of in situ acoustic velocity and attenuation values with those of water-saturated sediments, together provide ample evidence for the presence of in situ gas bubbles in the insonified volumes of sediments. These datasets are suitable for linear and non-linear inversion studies that estimate in situ greenhouse gas bubble populations, needed for future acoustical remote sensing applications.
0001-4966
2705–2716
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Dogan, Hakan
a1e136a9-aab8-4942-a977-0ae3440758cc
Fox, Paul
d43945f5-b449-4314-8225-76e73238436a
Mantouka, Agni
5cf325f2-3311-477a-b180-460e8724356e
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Robb, Gary BO
74b33ce8-cd9a-44f9-87ef-a1680f2892c5
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Dogan, Hakan
a1e136a9-aab8-4942-a977-0ae3440758cc
Fox, Paul
d43945f5-b449-4314-8225-76e73238436a
Mantouka, Agni
5cf325f2-3311-477a-b180-460e8724356e
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Robb, Gary BO
74b33ce8-cd9a-44f9-87ef-a1680f2892c5
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba

Leighton, Timothy, Dogan, Hakan, Fox, Paul, Mantouka, Agni, Best, Angus I., Robb, Gary BO and White, Paul (2021) Acoustic propagation in gassy intertidal marine sediments: an experimental study. Journal of the Acoustical Society of America, 150 (4), 2705–2716. (doi:10.1121/10.0006530).

Record type: Article

Abstract

The need to predict acoustic propagation through marine sediments that contain gas bubbles has become increasingly important for civil engineering and climate studies. There are relatively few in situ acoustic wave propagation studies of muddy intertidal sediments, in which bubbles of biogenic gas (generally methane, a potent greenhouse gas) are commonly found. We used a single experimental rig to conduct two in situ intertidal acoustical experiments to improve understanding of acoustic remote sensing of gassy sediments, eventually including gas bubble size distributions. In the first experiment, we measured sediment sound speed and attenuation between four aligned hydrophones for a quasi-plane wave propagating along the array. The second experiment involved a focused insonified sediment volume created by two transducers emitting coincident sound beams at different frequencies that generated bubble-mediated acoustic signals at combination frequencies. The results from sediment core analyses, and comparison of in situ acoustic velocity and attenuation values with those of water-saturated sediments, together provide ample evidence for the presence of in situ gas bubbles in the insonified volumes of sediments. These datasets are suitable for linear and non-linear inversion studies that estimate in situ greenhouse gas bubble populations, needed for future acoustical remote sensing applications.

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Accepted/In Press date: 25 August 2021
Published date: 12 October 2021
Additional Information: Funding Information: This work is funded by the Engineering and Physical Sciences Research Council (Grant No. EP/D000580/1, Principal Investigator T.G.L.), with support for further analysis of data from the National Environment Research Council UK (Grant No. NE/J022403/1, Principal Investigator T.G.L.). Data (doi: 10.5258/SOTON/D1937) can be found at https://doi.org/10.5258/SOTON/D1937. Publisher Copyright: © 2021 Acoustical Society of America.

Identifiers

Local EPrints ID: 451244
URI: http://eprints.soton.ac.uk/id/eprint/451244
ISSN: 0001-4966
PURE UUID: 0bb81c62-9335-4b71-8d61-5274954e8a61
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713

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Date deposited: 14 Sep 2021 20:59
Last modified: 17 Mar 2024 06:48

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Contributors

Author: Hakan Dogan
Author: Paul Fox
Author: Agni Mantouka
Author: Angus I. Best
Author: Gary BO Robb
Author: Paul White ORCID iD

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