Abstract
Detailed bathymetry of shoaling regions at two shallow water sites of the San Clemente Offshore Range in Southern California is combined with oceanographic data, taken with CTD, XBT, and bottom moored ADCPs during the winter and summer conditions, to evaluate the effects of environmental variability on acoustic transmission loss and ambient noise measurements made at 16 discrete frequencies ranging from 3 kHz to 30 kHz over 10 km path lengths. Over such short ranges, bottom slopes and tidal effects have the strongest influence on acoustic propagation. [Work supported by the U.S. Naval Oceanographic Office.]
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