Mitigation of Low-Frequency Underwater Anthropogenic Noise using Stationary Encapsulated Gas Bubbles

Conference Paper

Title: Mitigation of Low-Frequency Underwater Anthropogenic Noise using Stationary Encapsulated Gas Bubbles
Publication Date:
November 02, 2012
Conference Name: 11th European Conference on Underwater Acoustics
Conference Location: Edinburgh, Scotland
Publisher: Acoustical Society of America
Stressor:

Document Access

Website: External Link

Citation

Lee, K.; Wochner, M.; Wilson, P. (2012). Mitigation of Low-Frequency Underwater Anthropogenic Noise using Stationary Encapsulated Gas Bubbles. Paper Presented at the 11th European Conference on Underwater Acoustics, Edinburgh, Scotland.
Abstract: 

Collections of bubbles cause significant dispersion and attenuation of underwater sound near the individual bubbles' resonance frequencies and can potentially be used to abate low-frequency anthropogenic underwater noise. Such effects have been reported for large encapsulated bubbles with resonance frequencies below 100 Hz [J. Acoust. Soc. Am. {\bf{127}}:2015 (2010)] and significant attenuation due to bubble resonance phenomena and acoustic impedance mismatching was observed in experiments using a compact electromechanical acoustic source [J. Acoust. Soc. Am. {\bf{128}}:2279 (2010); J. Acoust. Soc. Am. {\bf{129}}:2462 (2011)]. We describe a method of shielding either a noise source or a receiver using screens or curtains of large encapsulated bubbles. This method was applied to two distinct types of real-world noise excitation: continuous wave noise radiated by a vibrating marine vessel and impact noise from marine pile driving. Experimental results show significant noise reduction ranging up to 40 dB can be attained using this method. In addition, a model of encapsulated bubble dynamics was developed and has been used in conjunction with numerical models to design the encapsulated bubble curtain systems.

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