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Passive acoustic quantification of gas releases

Passive acoustic quantification of gas releases
Passive acoustic quantification of gas releases
The assessment of undersea gas leakages from anthropogenic and natural sources is becoming increasingly important. This includes the detection of gas leaks and the quantification of gas flux. This has applications within oceanography (e.g. natural methane seeps) and the oil and gas industry (e.g. leaks from undersea gas pipelines, carbon capture and storage facilities). Gas escaping underwater can result in the formation of gas bubbles, and this leads to specific acoustic pressure fluctuations (sound) which can be analysed using passive acoustic systems. Such a technique offers the advantage of lower electrical power requirements for long term monitoring. It is common practice for researchers to identify single bubble injection events from time histories or time frequency representations of hydrophone data, and infer bubble sizes from the centre frequency of the emission. Such a technique is well suited for gas releases that represent low flow rates, and involving solitary bubble release. However, for larger events, with the overlapping of bubble acoustic emissions, the inability to discriminate each individual bubble injection event makes this approach inappropriate. In this study, an inverse method to quantify such release is used. The model is first outlined and following this its accuracy at different flow rate regimes is tested against experimental data collected from tests which took place in a large water tank. The direct measurements are compared to estimates inferred from acoustics.
methane seeps, inverse problem, passive acoustic
Berges, B.J.P.
4ffd6f4b-7324-4c41-bb42-4bc9295ef79c
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
White, P.R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Tomczyk, M.
1025b01f-30bc-420b-af11-2ecfc2adb1a9
Berges, B.J.P.
4ffd6f4b-7324-4c41-bb42-4bc9295ef79c
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
White, P.R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Tomczyk, M.
1025b01f-30bc-420b-af11-2ecfc2adb1a9

Berges, B.J.P., Leighton, T.G., White, P.R. and Tomczyk, M. (2014) Passive acoustic quantification of gas releases. 2nd International Conference and Exhibition on Underwater Acoustics (UA2014), Greece. 22 - 27 Jun 2014. 8 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The assessment of undersea gas leakages from anthropogenic and natural sources is becoming increasingly important. This includes the detection of gas leaks and the quantification of gas flux. This has applications within oceanography (e.g. natural methane seeps) and the oil and gas industry (e.g. leaks from undersea gas pipelines, carbon capture and storage facilities). Gas escaping underwater can result in the formation of gas bubbles, and this leads to specific acoustic pressure fluctuations (sound) which can be analysed using passive acoustic systems. Such a technique offers the advantage of lower electrical power requirements for long term monitoring. It is common practice for researchers to identify single bubble injection events from time histories or time frequency representations of hydrophone data, and infer bubble sizes from the centre frequency of the emission. Such a technique is well suited for gas releases that represent low flow rates, and involving solitary bubble release. However, for larger events, with the overlapping of bubble acoustic emissions, the inability to discriminate each individual bubble injection event makes this approach inappropriate. In this study, an inverse method to quantify such release is used. The model is first outlined and following this its accuracy at different flow rate regimes is tested against experimental data collected from tests which took place in a large water tank. The direct measurements are compared to estimates inferred from acoustics.

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More information

Published date: June 2014
Venue - Dates: 2nd International Conference and Exhibition on Underwater Acoustics (UA2014), Greece, 2014-06-22 - 2014-06-27
Keywords: methane seeps, inverse problem, passive acoustic
Organisations: Inst. Sound & Vibration Research

Identifiers

Local EPrints ID: 369556
URI: http://eprints.soton.ac.uk/id/eprint/369556
PURE UUID: 8ee2c464-ddef-4b71-9628-89c9e78052a4
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: 30 Sep 2014 13:30
Last modified: 06 Jun 2018 13:12

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Contributors

Author: B.J.P. Berges
Author: T.G. Leighton ORCID iD
Author: P.R. White ORCID iD
Author: M. Tomczyk

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