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Passive acoustic quantification of gas fluxes during controlled gas release experiments

Passive acoustic quantification of gas fluxes during controlled gas release experiments
Passive acoustic quantification of gas fluxes during controlled gas release experiments
The detection and quantification of an underwater gas release are becoming increasingly important for oceanographic and industrial applications. Whilst the detection of each individual bubble injection events, with commensurate sizing from the natural frequency of the acoustic emission, has been common for decades in laboratory applications, it is impractical to do this when hundreds of bubbles are released simultaneously, as can occur with large methane seeps, or leaks from gas pipelines or undersea facilities for carbon capture and storage. This paper draws on data from two experimental studies and demonstrates the usefulness of passive acoustics to monitor gas leaks of this level. It firstly shows experimental validation tests of a recent model aimed at inverting the acoustic emissions of gas releases in a water tank. Different gas flow rates for two different nozzle types are estimated using this acoustic inversion and compared to measurements from a mass flow meter. The estimates are found to predict accurately volumes of released gas. Secondly, this paper demonstrates the use of this method at sea in the framework of the QICS project (controlled release of CO2 gas). The results in the form of gas flow rate estimates from bubbles are presented. These track, with good agreement, the injected gas and correlate within an order of magnitude with diver measurements. Data also suggest correlation with tidal effects with a decrease of 15.1 kg /d gas flow for every 1 m increase in tidal height (equivalent to 5.9 L/min when converted to standard ambient temperature [25 °C] and absolute pressure [100 kPa] conditions, SATP
1750-5836
1-71
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
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

Berges, B.J.P., Leighton, T.G. and White, P.R. (2015) Passive acoustic quantification of gas fluxes during controlled gas release experiments International Journal of Greenhouse Gas Control, pp. 1-71.

Record type: Article

Abstract

The detection and quantification of an underwater gas release are becoming increasingly important for oceanographic and industrial applications. Whilst the detection of each individual bubble injection events, with commensurate sizing from the natural frequency of the acoustic emission, has been common for decades in laboratory applications, it is impractical to do this when hundreds of bubbles are released simultaneously, as can occur with large methane seeps, or leaks from gas pipelines or undersea facilities for carbon capture and storage. This paper draws on data from two experimental studies and demonstrates the usefulness of passive acoustics to monitor gas leaks of this level. It firstly shows experimental validation tests of a recent model aimed at inverting the acoustic emissions of gas releases in a water tank. Different gas flow rates for two different nozzle types are estimated using this acoustic inversion and compared to measurements from a mass flow meter. The estimates are found to predict accurately volumes of released gas. Secondly, this paper demonstrates the use of this method at sea in the framework of the QICS project (controlled release of CO2 gas). The results in the form of gas flow rate estimates from bubbles are presented. These track, with good agreement, the injected gas and correlate within an order of magnitude with diver measurements. Data also suggest correlation with tidal effects with a decrease of 15.1 kg /d gas flow for every 1 m increase in tidal height (equivalent to 5.9 L/min when converted to standard ambient temperature [25 °C] and absolute pressure [100 kPa] conditions, SATP

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e-pub ahead of print date: 1 March 2015
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 375114
URI: http://eprints.soton.ac.uk/id/eprint/375114
ISSN: 1750-5836
PURE UUID: 66edcaba-352e-4084-ac59-998431cd1737
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: 12 Mar 2015 13:31
Last modified: 02 Sep 2017 09:13

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Contributors

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

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