The University of Southampton
University of Southampton Institutional Repository

A noise impact assessment model for passive acoustic measurements of seabed gas fluxes

A noise impact assessment model for passive acoustic measurements of seabed gas fluxes
A noise impact assessment model for passive acoustic measurements of seabed gas fluxes
Accurate determination of seabed gas flux is important for understanding natural processes as well as giving confidence that the size of any leaks from marine infrastructure can be properly assessed. Acoustic methods for flux determination require a relatively quiet underwater environment, and can fail when there is too much noise from other natural or anthropogenic sources. This study applies an acoustic monitoring example of seabed gas leakage in terms of sound level intensity, to statistically assess and minimize the impact from oceanic noise on seabed acoustic experiments which require relative quiet environment. It addresses the question: how far from a source of radiated ambient noise does a recording hydrophone and location of seabed gas need to be so that acoustic methods for remotely determining gas flux are successful. We develop a model to assess impacts of ambient noise under various conditions, incorporating sound/noise sources (seabed gas leaks, sea surface agitation and shipping) and underwater acoustic propagation. The reliability of the model is tested by comparing measured seabed ambient noise in the central North Sea, and the robustness of it is verified by presenting statistical outliers and a receiver operating characteristic (ROC) curve. A range of scenarios are presented for several gas flow rates, which show the threshold of detection when the recording hydrophone is at different distances from the location of seabed gas escape, and competing noise sources (including shipping and surface waves).
0029-8018
294-304
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae

Li, Jianghui, White, Paul R., Bull, Jonathan M. and Leighton, Timothy G. (2019) A noise impact assessment model for passive acoustic measurements of seabed gas fluxes. Ocean Engineering, 183, 294-304. (doi:10.1016/j.oceaneng.2019.03.046).

Record type: Article

Abstract

Accurate determination of seabed gas flux is important for understanding natural processes as well as giving confidence that the size of any leaks from marine infrastructure can be properly assessed. Acoustic methods for flux determination require a relatively quiet underwater environment, and can fail when there is too much noise from other natural or anthropogenic sources. This study applies an acoustic monitoring example of seabed gas leakage in terms of sound level intensity, to statistically assess and minimize the impact from oceanic noise on seabed acoustic experiments which require relative quiet environment. It addresses the question: how far from a source of radiated ambient noise does a recording hydrophone and location of seabed gas need to be so that acoustic methods for remotely determining gas flux are successful. We develop a model to assess impacts of ambient noise under various conditions, incorporating sound/noise sources (seabed gas leaks, sea surface agitation and shipping) and underwater acoustic propagation. The reliability of the model is tested by comparing measured seabed ambient noise in the central North Sea, and the robustness of it is verified by presenting statistical outliers and a receiver operating characteristic (ROC) curve. A range of scenarios are presented for several gas flow rates, which show the threshold of detection when the recording hydrophone is at different distances from the location of seabed gas escape, and competing noise sources (including shipping and surface waves).

Text
elsarticle-ShipNoiseModel_accepted - Accepted Manuscript
Restricted to Repository staff only until 1 March 2021.
Request a copy
Text
1-s2.0-S0029801818318018-main - Version of Record
Restricted to Repository staff only
Request a copy

More information

Accepted/In Press date: 29 March 2019
e-pub ahead of print date: 15 May 2019
Published date: 1 July 2019

Identifiers

Local EPrints ID: 430040
URI: https://eprints.soton.ac.uk/id/eprint/430040
ISSN: 0029-8018
PURE UUID: e5440592-0c48-46b5-8592-420aeeed51ae
ORCID for Jianghui Li: ORCID iD orcid.org/0000-0002-2956-5940
ORCID for Paul R. White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for Timothy G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

Catalogue record

Date deposited: 10 Apr 2019 16:30
Last modified: 06 Aug 2019 00:37

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×