Ultrasonic Velocity Meter Station schematic (channel top and cross-section views)

A UVM (Laenen, 1985) transmits acoustic pulses back and forth across a channel and precisely measures the travel time of each pulse. The difference in travel time between a pair of back and forth pulses provides an average velocity (Vp) across the channel at the depth of the transducers. The measured velocity (Vp) is not an average cross-sectional velocity and is referred to as an "index velocity" (Vi) that is used when processing the data to determine an average cross-sectional velocity.

Back