The ADCP measures water currents with sound, using a principle of sound waves called the Doppler effect. An Acoustic Doppler Current Profiler, or Acoustic Doppler Profiler, is often referred to with the acronym ADCP. Scientists use the instrument to measure how fast water is moving across an entire water column. An ADCP anchored to the seafloor can measure current speed not just at the bottom, but also at equal intervals all the way up to the surface. The instrument can also be mounted horizontally on seawalls or bridge pilings in rivers and canals to measure the current profile from shore to shore, and to the bottoms of ships to take constant current measurements as the boats move. The ADCP provided higher resolution information on the water depth and riverbed morphology cross-section , which was used to corroborate the ADP depth estimates.