[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).
- rc80618a.jpg: Tms3, edge velocity
versus central velocity, from ADCP data.
- rc80618b.jpg: Tms3, central velocity
versus full-width velocity, from ADCP data.
- rc80619a.jpg: Tms3, time series of
velocities averaged over the full channel and over the eastern and
western edges of the channel.
versus full-width velocity, from ADCP data.
- rc80618c.jpg: Tms4, edge velocity
versus central velocity, from ADCP data.
- rc80618d.jpg: Tms4, central velocity
versus full-width velocity, from ADCP data.
- rc80619b.jpg: Tms4, time series of
velocities averaged over the full channel and over the eastern and
western edges of the channel.
