Underwater noise from commercial shipping throughout the oceans has been increasing over the past decades and the environmental impact of this noise remains an area of great uncertainty. This has led to the measurement of noise from commercial vessels in order to understand the impacts that these vessels may engender. Hydrofoils are used by ferries in various locations around the world and locally may be a significant contributing factor of the soundscape. However, the investigation on underwater radiated noise from the activity of hydrofoils in the field has not been widely conducted. This article is an attempt to characterize the noise from hydrofoils in the field. Detailed measurements in the coastal water close to the Panarea port, Italy are reported. The investigation describes the broadband frequency spectrum with the main energy approximately centered on 30–130 Hz but covering frequencies up to tens of kHz. A key result was that the spectrum of the noise varied between the three stages (displacement, transition, and foiling) of the hydrofoils heading into or out of the port.
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November 2019
November 26 2019
Underwater radiated noise from hydrofoils in coastal water
Jianghui Li;
Jianghui Li
a)
1
Institute of Sound and Vibration Research, University of Southampton
, Southampton, SO17 1BJ, United Kingdom
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Paul R. White;
Paul R. White
1
Institute of Sound and Vibration Research, University of Southampton
, Southampton, SO17 1BJ, United Kingdom
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Ben Roche;
Ben Roche
2
Ocean and Earth Science, University of Southampton, National Oceanography Centre
, Southampton, SO14 3ZH, United Kingdom
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John W. Davis;
John W. Davis
2
Ocean and Earth Science, University of Southampton, National Oceanography Centre
, Southampton, SO14 3ZH, United Kingdom
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Timothy G. Leighton
Timothy G. Leighton
1
Institute of Sound and Vibration Research, University of Southampton
, Southampton, SO17 1BJ, United Kingdom
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a)
Electronic mail: [email protected]
J. Acoust. Soc. Am. 146, 3552–3561 (2019)
Article history
Received:
April 03 2019
Accepted:
October 31 2019
Citation
Jianghui Li, Paul R. White, Ben Roche, John W. Davis, Timothy G. Leighton; Underwater radiated noise from hydrofoils in coastal water. J. Acoust. Soc. Am. 1 November 2019; 146 (5): 3552–3561. https://doi.org/10.1121/1.5134779
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