Journal Article10.1121/1.420513
Acoustic hot-spots and breaking wave noise in the surf zone
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TL;DR: In this article, the authors measured the horizontal directivity of underwater sound made behind individual breaking waves in the surf zone and proposed a propagation model for the surf noise, based on the interaction between the noise radiated by the breaking wavecrest and the residue of bubbly water left behind the wave.
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Abstract: Measurements of the horizontal directivity of the underwater sound made behind individual breaking waves in the surf zone are presented. To an observer behind a breaking wave, the breaking noise appears to radiate from acoustic hot-spots, which are compact sources at the ends of the breaking wavecrest. The hot-spots move through the surf zone as the length of breaking wavecrest increases, leading to systematic temporal variations in the wave noise directionality. Measurements of the acoustical properties of the mixture of water and bubbles left behind the breaking wave are presented. Sound speeds as low as 500 m/s and acoustic absorption up to 50 dB per meter occur in the bubbly region. Based on these measurements and a propagation model for the surf noise, it is proposed that the observed horizontal directivity is caused by the interaction between the noise radiated by the breaking wavecrest and the residue of bubbly water left behind the wave.
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Citations
Boundary influences In high frequency, shallow water acoustics
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Directionality of the ambient noise field in an Arctic, glacial bay.
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Surf-generated noise signatures: A comparison of plunging and spilling breakers
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Mapping underwater sound noise and assessing its sources by using a self-organizing maps method
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Anthony J. Bowen,Robert T. Guza +1 more
TL;DR: In this article, it was shown that the response at the beat frequency is stronger when the resonance conditions for edge wave growth are satisfied and the response is in the form of the theoretically predicted edge wave mode, even when the incident waves are breaking.
141
Void-fraction measurements and sound-speed fields in bubble plumes generated by breaking waves
Eric Lamarre,W. K. Melville +1 more
TL;DR: In this paper, the radial dependence of the void fraction and sound speed field in bubble plumes generated by large-scale 3D laboratory breaking waves was investigated. But the results were limited to the case of a single bubble plume.
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