An Acoustic Doppler Current Profiler (ADCP) is an instrument used to measure water currents in oceans, rivers, and lakes. It works by emitting sound waves and analyzing the frequency shift of the waves reflected off particles in the water. This allows researchers to determine the speed and direction of the water flow at various depths. ADCPs are commonly used in environmental monitoring, hydrology, and oceanography. They provide valuable data for understanding water dynamics, sediment transport, and marine ecosystems. By offering real-time measurements, ADCPs help scientists and engineers make informed decisions regarding water resource management and flood prediction.