Acoustic Remote Sensing of Wind Wave Directional Parameters

A Marsh McBirney MODEL MMI-555 was moored for a period of 21 days in the vicinity of Ambrose Tower, N.Y. close to a special prototype bottom mounted 300kHz Ametek Straza acoustic Doppler current profiler. The MMI-555 was operated in the burst mode taking 60 samples at 1-second intervals, each hour. Variances of the horizontal water velocities, measured by the MMI-555 and rotated into the directions of the Ametek beams, are compared to standard deviations of water velocities measured on the Ametek beams in bins near the MMI-555 depth. paper provides further evidence in support of the authors previously stated hypothesis that directional waveheight spectra can be estimated from acoustic Doppler measurements.