https://www.whoi.edu/what-we-do/explore/instruments/instruments-sensors-samplers/acoustic-doppler-current-profiler-adcp/
Acoustic Doppler Current Profiler (ADCP) - Woods Hole Oceanographic Institution
An Acoustic Doppler Current Profiler (ADCP) uses sound waves to measure water current speed at multiple depths, helping scientists study ocean and river flow.
acoustic dopplerwoods holecurrentprofileradcp
https://www.ysi.com/sontek
SonTek Acoustic Doppler Current Profiler for Water Flow Measurement and Velocity Data Collection
SonTek manufactures acoustic Doppler instrumentation for water velocity measurement (flow and current monitoring) in oceans, rivers, lakes, harbors, canals,...
acoustic dopplerfor waterflow measurement