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International standards for the measurement of underwater noise from vessels: numerical modelling in support of a shallow water standard

International standards for the measurement of underwater noise from vessels: numerical modelling in support of a shallow water standard
International standards for the measurement of underwater noise from vessels: numerical modelling in support of a shallow water standard
ANSI and ISO have issued standards for the measurement of the radiated noise level of surface vessels in deep water. In addition, a draft standard for the conversion of such measurements into a monopole source level, as required for environmental noise models, is at an advanced stage. However, many operators and investigators are constrained to making measurements in shallow water where both sea-surface and seabed effects are important. In order to study the influence of these effects a numerical study has been performed using both an image source model and OASES, with very good agreement. The goal of this work has been to understand the variability of the correction factor required to convert measurements of received pressure, at short range, into the equivalent source level in such an environment. These calculations have included the effects of reflection at both the sea-surface and an attenuating seabed. The influences of the water depth, seabed type, distance of closest approach, and number and location of the hydrophones have been investigated. The results show how the correction factor varies and indicate the extent to which simplified approximations can be used for the correction factor.
0001-4966
Humphrey, Victor
23c9bd0c-7870-428f-b0dd-5ff158d22590
Cen, Yin
266ce7c1-c3a8-4498-bb1b-ac8bfba7b495
Robinson, Stephen
1a3ecdd6-eaff-436c-b347-844f0ab35b52
Humphrey, Victor
23c9bd0c-7870-428f-b0dd-5ff158d22590
Cen, Yin
266ce7c1-c3a8-4498-bb1b-ac8bfba7b495
Robinson, Stephen
1a3ecdd6-eaff-436c-b347-844f0ab35b52

Humphrey, Victor, Cen, Yin and Robinson, Stephen (2019) International standards for the measurement of underwater noise from vessels: numerical modelling in support of a shallow water standard. Journal of the Acoustical Society of America, 146 (4), [3061]. (doi:10.1121/1.5137624).

Record type: Article

Abstract

ANSI and ISO have issued standards for the measurement of the radiated noise level of surface vessels in deep water. In addition, a draft standard for the conversion of such measurements into a monopole source level, as required for environmental noise models, is at an advanced stage. However, many operators and investigators are constrained to making measurements in shallow water where both sea-surface and seabed effects are important. In order to study the influence of these effects a numerical study has been performed using both an image source model and OASES, with very good agreement. The goal of this work has been to understand the variability of the correction factor required to convert measurements of received pressure, at short range, into the equivalent source level in such an environment. These calculations have included the effects of reflection at both the sea-surface and an attenuating seabed. The influences of the water depth, seabed type, distance of closest approach, and number and location of the hydrophones have been investigated. The results show how the correction factor varies and indicate the extent to which simplified approximations can be used for the correction factor.

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More information

e-pub ahead of print date: 13 November 2019
Published date: 2019

Identifiers

Local EPrints ID: 442517
URI: http://eprints.soton.ac.uk/id/eprint/442517
ISSN: 0001-4966
PURE UUID: b95a5e30-45c1-461d-bda4-1d9c440d5689
ORCID for Victor Humphrey: ORCID iD orcid.org/0000-0002-3580-5373

Catalogue record

Date deposited: 17 Jul 2020 16:31
Last modified: 01 Aug 2020 01:35

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