[Note: this is an internal working document of a USGS-SFSU collaboration. Data, analysis and results herin should not be considered as final or accurate. Final results will be presented in print.]
ADCP-UVM Rating Curves
for calibration of the
Ultrasonic Velocity Meters at Three-Mile Slough
( references |ORE UVM errors |ADCP errors |ADCP software |Discharge main page )

UVM's are used in continuous operation to monitor current. However, they directly measure only a line-average of the parallel component of the velocity. The UVM velocity must be considered as an index of channel discharge. We calibrate it by taking full-channel vector velocity profiles using a boat-mounted ADCP. In this section we discuss this calibration procedure.

We will discuss two calibration data sets, tms3 (recorded on June 2, 1998), and tms4 (June 9, 1998).