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Delta-k acoustic sensing of ocean surface waves
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1997
[PDF-5.48 MB]
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Description:A high-frequency acoustic method for measuring ocean directional wave spectra is put forward. The method is termed Ak-acoustics and is analogous to the Ak-radar and Ak-lidar techniques for measuring ocean directional wave spectra. Significant practical differences between high-frequency Ak-acoustics and Ak-radar are quantified. The most important of these differences is the ability of high-frequency Ak-acoustics to measure the orbital velocity of a surface wave when scattering from subsurface scattering elements such as air bubbles. Experimental measurements of coherent high-frequency acoustic backscatter from ocean surface-wave-induced advection of bubble clouds are shown to support the proposed Ak-acoustic method. Results of an open-ocean experiment designed to demonstrate the Ak-acoustic method are reported. The failure to see a Ak resonance line was traced to unfavorable wind direction during the experiment.
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Rights Information:CC0 Public Domain
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