Abstract
Acoustic pusles entering a sandy sediment through the water‐sediment interface were observed. An acoustic projector located in the water column was used to insonify an array of sensors embedded in the sediment. Carrier frequencies of from 5 to 80 kHz were projected toward the sediment interface at grazing angles below, near, and above the critical value. Sound‐pressure levels and time of arrival differences associated with the passage of the acoustic pulse were determined from the sensor data. A weighted least‐squares algorithm was used to fit a plane to the arrival time differences yielding wave‐front direction and speed estimates. Estimates of acoustic attenuation and wave‐front coherence were also obtained. [Work supported by ONT under NORDA management.]
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