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Passive acoustic monitoring of a natural CO2 seep site - implications for carbon capture and storage

Passive acoustic monitoring of a natural CO2 seep site - implications for carbon capture and storage
Passive acoustic monitoring of a natural CO2 seep site - implications for carbon capture and storage
Estimating the range at which an acoustic receiver can detect greenhouse gas (e.g., CO2) leakage from the sub-seabed is essential for determining whether passive acoustic techniques can be an effective environmental monitoring tool above marine carbon storage sites. Here we report results from a shallow water experiment completed offshore the island of Panarea, Sicily, at a natural CO2 vent site, where the ability of passive acoustics to detect and quantify gas flux was determined at different distances. Cross-correlation methods determined the time of arrival for different travel paths which were confirmed by acoustic modelling. We develop an approach to quantify vent bubble size and gas flux. Inversion of the acoustic data was completed using the modelled impulse response to provide equivalent propagation ranges rather than physical ranges. The results show that our approach is capable of detecting a CO2 bubble plume with a gas flux rate of 2.3L/min at ranges of up to 8m, and determining gas flux and bubble size accurately at ranges of up to 4m in shallow water, where the bubble sound pressure is 10dB above that of the ambient noise.
Bubble transect, underwater acoustics, multipath, greenhouse gas, Marine Carbon Capture and Storage
1750-5836
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
Bull, Jonathan
974037fd-544b-458f-98cc-ce8eca89e3c8
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Davis, John
7f762b01-375b-42c8-80cb-65baefffdb97
Deponte, Michele
6ca3d1dd-6c7a-48bc-9d15-146e02c98f3e
Gordini, Emiliano
d2a0eda7-37d5-4b11-9801-328849da0ba2
Cotterle, Diego
5e887b72-0069-4014-960f-1b2dfa5c1759
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
Bull, Jonathan
974037fd-544b-458f-98cc-ce8eca89e3c8
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Davis, John
7f762b01-375b-42c8-80cb-65baefffdb97
Deponte, Michele
6ca3d1dd-6c7a-48bc-9d15-146e02c98f3e
Gordini, Emiliano
d2a0eda7-37d5-4b11-9801-328849da0ba2
Cotterle, Diego
5e887b72-0069-4014-960f-1b2dfa5c1759

Li, Jianghui, Roche, Ben, Bull, Jonathan, White, Paul, Davis, John, Deponte, Michele, Gordini, Emiliano and Cotterle, Diego (2020) Passive acoustic monitoring of a natural CO2 seep site - implications for carbon capture and storage. International Journal of Greenhouse Gas Control, 93, [102899]. (doi:10.1016/j.ijggc.2019.102899).

Record type: Article

Abstract

Estimating the range at which an acoustic receiver can detect greenhouse gas (e.g., CO2) leakage from the sub-seabed is essential for determining whether passive acoustic techniques can be an effective environmental monitoring tool above marine carbon storage sites. Here we report results from a shallow water experiment completed offshore the island of Panarea, Sicily, at a natural CO2 vent site, where the ability of passive acoustics to detect and quantify gas flux was determined at different distances. Cross-correlation methods determined the time of arrival for different travel paths which were confirmed by acoustic modelling. We develop an approach to quantify vent bubble size and gas flux. Inversion of the acoustic data was completed using the modelled impulse response to provide equivalent propagation ranges rather than physical ranges. The results show that our approach is capable of detecting a CO2 bubble plume with a gas flux rate of 2.3L/min at ranges of up to 8m, and determining gas flux and bubble size accurately at ranges of up to 4m in shallow water, where the bubble sound pressure is 10dB above that of the ambient noise.

Text
JGGC_2019_336_R2_20191105 - Accepted Manuscript
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More information

Accepted/In Press date: 6 November 2019
e-pub ahead of print date: 6 December 2019
Published date: February 2020
Keywords: Bubble transect, underwater acoustics, multipath, greenhouse gas, Marine Carbon Capture and Storage

Identifiers

Local EPrints ID: 435795
URI: http://eprints.soton.ac.uk/id/eprint/435795
ISSN: 1750-5836
PURE UUID: 72b95b35-04f7-4c7c-8e7c-e7320d5998f0
ORCID for Jianghui Li: ORCID iD orcid.org/0000-0002-2956-5940
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713

Catalogue record

Date deposited: 20 Nov 2019 17:30
Last modified: 06 Dec 2020 05:01

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