The IEEE Seventh Working Conference on Current Measurement Technology

Current and Wave Monitoring and Emerging Technologies

March 13-15 | Bahia Hotel | San Diego, CA, USA

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Long-Range Acoustic Doppler Array Measurements of Surface Velocities

Jerome A. Smith

Status: Pending Approval

UCSD code 0213
9500 Gilman Drive
La Jolla, CA USA
92093-0213

Phone: 858-534-4229
Email: jasmith@ucsd.edu

Co-Authors:
Rob Pinkel
UCSD code 0213
9500 Gilman Drive
La Jolla, CA 92093-0213

A 50 kHz acoustic Doppler sonar system was developed to obtain sequences of surface velocity measurements over km-sized areas of the ocean. The system was deployed and operated recently near Oahu, Hawaii, and mapped backscatter intensity and Doppler shift (radial velocity) over an area typically extending more than 1.5 km in range by 42° in bearing (azimuth). The 32 element array yields resolutions of roughly 10 m in range by 1.5° bearing, sampling every 2.5 s or so, with single-sample variances of order 10 cm/s. The Hawaii data set, taken in conjunction with the Hawaiian Ocean Mixing Experiment (HOME), includes both high-frequency internal waves and Langmuir circulation. The former are associated with the strong internal tides generated nearby, while the latter are driven by the trades and/or storm winds, together with the (rather complex) directional wave field. The system also resolves the dominant waves (i.e., with periods longer than the Nyquist value of 5 seconds), revealing several discrete directional

Submitted on November 12, 2002

Sponsored by the Current Measurement Technology Committee (CMTC) of the IEEE Oceanic Engineering Society.

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