Abstract
Horizontal directionality of ambient noise was measured at ranges up to 4 km from the eastern shore of Monterey Bay, California. Water depths at the sites ranged from 8 to 73 m. A steerable cardioid receiving pattern was formed using signals telemetered from dipole and omnidirectional hydrophones suspended from tethered buoys. With no nearby shipping, whenever the maximum of the cardioid pattern was directed toward the beach, noise levels in the range 20 to 500 Hz were greater than those obtained when the maximum was directed seaward. This difference (seaward versus shoreward), which depended on range from the beach and on frequency, was 7 dB at 100 Hz at the 4‐km site. Surf beat was clearly audible when the cardioid maximum was steered shoreward at ranges as great as 2 km. The measurements, made when wind and surf were high, suggest strongly that under some conditions breaking surf can contribute significantly to ambient noise in fairly deep continental shelf waters. [Supported by the NPS Foundation Research Program and the Naval Sea Systems Command.]
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