This picture shows the ADCP velocities 10m below sea surface. Observations were carried out between April 26th and May 9th, 1994, at the south coast of Japan by Maritime Safety Agency, Japan.
This picture shows the Stream function arising from seventh-order polynomial fit the velocities of above figure. The contour increment is 2 km (m/sec).
Satoshi SATO: Stream Function Arising from the Polynominal Fit to the Velocities: Report of Hydrographic Researches, No. 33 March, 15-20, (1997)
If you have a MPEG viewer, you can see an animation of current profile variation observed by ADCP as a bird's eye view.
This animation shows the ADCP time-series data at the HOTs station off Hawaii islands from March 24 to 28, 1996. The layer depth displayed on this animation are 30m, 50m, 100m, 200m from sea surface. The vertical profile fluctuates very much in time while sometimes it shows a clockwise rotation probably showing inertial oscillations. Current at 200m layer is much variable as well as at upper layers where the current should have big time-dependent components induced by wind drive currents or Ekman currents.
More information is available at the Joint Archive for Shipboard ADCP (JASADCP), the University of Hawaii.