Low-Frequency Sound Propagation in the Yellow Sea Results from the 1996 China-U.S. Experiment
WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
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Two sets of acoustic measurements made by the Applied Physics Laboratory, University of Washington, as part of the August 1996 joint U.S.-China Yellow Sea Experiment are analyzed. One set consists of broadband propagation measurements for which explosive TNT sources were used. These data were reduced to estimates of calibrated transmission loss, which, along with the recorded signal waveforms, were interpreted to infer a geoacoustic model for the seabed. The other set consists of narrowband acoustic fluctuation measurements plus broadband ambient noise measurements. The data show an extraordinary time history during which the ambient noise level varies by as much as 30 dB over a period of 6 to 7 hours.