Abstract
Extensive measurements of void fraction and bubble size density due to wave breaking both inside and outside surf zones were made by the Naval Research Laboratory during two joint experiments sponsored by ONR: the Scripps Bubbles/Acoustics Experiment at Scripps Institution of Oceanography, March 1997, and the Sandy Duck ’97 Experiment at the Army CERC Field Research Facility, Duck, NC, Sept.–Oct. 1997. Using a new technique that employs swing bar void fraction staffs anchored on the sand bottom, the new data show very strong tidal effects on the vertical distributions of void fraction. Data will also be presented on the temporal evolution of bubble size density (radius =15–1200 μ) during local storms. Finally, some new results on direct correlation of acoustic noise intensity using a hydrophone with co-located void fraction measurement will be presented.
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