Seafloor noise ensemble from vessel manoeuvre in the central North Sea
Seafloor noise ensemble from vessel manoeuvre in the central North Sea
Anthropogenic noise, e.g., shipping noise, are usually unavoidable and radiate over a certain area, e.g., 10 km depending on the noise source level and acoustic propagation channel, which might affect seabed acoustic engineering as well as species' communication, behaviour, fitness and consequently their survival. Therefore, better understanding of these noise sources allows better prediction of performance of seafloor acoustic research, engineering, and biological environment. Measurements from a hydrophone system mounted on the seafloor in the central North Sea permit comparisons between temporal and spectral seafloor noise as a vessel transits nearby. The measured data indicates that the peak energy in the power spectral density (PSD) of seafloor noise is dominated by that of multiple vessel tonal noise. The tidal level has a strong negative correlation with the seafloor noise variance, and the vessel to hydrophone angle has a modest negative correlation with both the noise variance and kurtosis, particularly within a certain distance (6.6 km at depth 150 m here). As the vessel approaches, the seafloor noise is sensitive to the noise radiated from the vessel manoeuvre dominated at frequencies 400-900 Hz. Further, as the vessel speed increases from 2 knots to 15 knots, the vessel tonal increases the PSD by 10-20 dB at multiple narrow frequency bands (770 and 850 Hz). Results reported here advance the knowledge of seafloor acoustic sensitivity to nearby transit vessels.
seafloor, shipping noise, tide, underwater acoustics, vessel manoeuvre, wind
1-11
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
15 January 2020
Li, Jianghui
9c589194-00fa-4d42-abaf-53a32789cc5e
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Roche, Ben
2746ee9e-1b87-4d2f-b4e1-dcdc0ca7a719
Li, Jianghui, White, Paul R. and Roche, Ben
(2020)
Seafloor noise ensemble from vessel manoeuvre in the central North Sea.
Ocean Engineering, 196, , [106836].
(doi:10.1016/j.oceaneng.2019.106836).
Abstract
Anthropogenic noise, e.g., shipping noise, are usually unavoidable and radiate over a certain area, e.g., 10 km depending on the noise source level and acoustic propagation channel, which might affect seabed acoustic engineering as well as species' communication, behaviour, fitness and consequently their survival. Therefore, better understanding of these noise sources allows better prediction of performance of seafloor acoustic research, engineering, and biological environment. Measurements from a hydrophone system mounted on the seafloor in the central North Sea permit comparisons between temporal and spectral seafloor noise as a vessel transits nearby. The measured data indicates that the peak energy in the power spectral density (PSD) of seafloor noise is dominated by that of multiple vessel tonal noise. The tidal level has a strong negative correlation with the seafloor noise variance, and the vessel to hydrophone angle has a modest negative correlation with both the noise variance and kurtosis, particularly within a certain distance (6.6 km at depth 150 m here). As the vessel approaches, the seafloor noise is sensitive to the noise radiated from the vessel manoeuvre dominated at frequencies 400-900 Hz. Further, as the vessel speed increases from 2 knots to 15 knots, the vessel tonal increases the PSD by 10-20 dB at multiple narrow frequency bands (770 and 850 Hz). Results reported here advance the knowledge of seafloor acoustic sensitivity to nearby transit vessels.
Text
elsarticle-Seafloor Noise
- Accepted Manuscript
More information
Accepted/In Press date: 7 December 2019
e-pub ahead of print date: 20 December 2019
Published date: 15 January 2020
Additional Information:
Funding Information:
Funding for this work was provided by NERC (Natural Environment Research Council) grant NE/N01610/1 and the European Union’s Horizon 2020 research and innovation programme under the grant agreement number 654462 (STEMM-CCS). We are grateful to Jonathan Bull and Dan Ellis for collecting the passive acoustic data, as well as the Captain of the RRS ‘James Cook’ and crew for enabling the scientific measurements at sea during the JC152 cruise.
Publisher Copyright:
© 2019 Elsevier Ltd
Keywords:
seafloor, shipping noise, tide, underwater acoustics, vessel manoeuvre, wind
Identifiers
Local EPrints ID: 436872
URI: http://eprints.soton.ac.uk/id/eprint/436872
ISSN: 0029-8018
PURE UUID: b1d57f9d-cc7c-4c12-be31-304d48a3b77f
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Date deposited: 13 Jan 2020 17:30
Last modified: 12 Jul 2024 04:04
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Author:
Ben Roche
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