Xylem SonTek FlowTracker2 - Point Velocity Measurement; Station Measurement (Pressure Sensor)

SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
166
Variable
Description
Units
Decimal
Vel. X
Mean X velocity component of all samples.
Velocity is despiked and mounting correction
applied (if applicable).
m/s or ft/s 4
Vel. Y
Mean Y velocity component of all samples.
Velocity is despiked and mounting correction
applied (if applicable).
m/s or ft/s 4
Vel. Z
Mean Z velocity component of all samples.
Velocity is despiked and mounting correction
applied (if applicable).
m/s or ft/s 4
σV. X
Standard error of X velocity component.
m/s or ft/s
4
σV. Y
Standard error of Y velocity component.
m/s or ft/s
4
σV. Z
Standard error of Z velocity component.
m/s or ft/s
4
SNR. 1
Signal to noise ratio of Beam 1
dB
3
SNR. 2
Signal to noise ratio of Beam 2
dB
3
SNR. 3
Signal to noise ratio of Beam 3
dB
3
Angle
Flow angle relative to X direction
Degree
2
Bnd
Boundary QC value
n/a
n/a
Tilt
Mean wading rod angle during velocity
measurement
Degree 2
Temp
Mean temperature during measurement
°C or °F
2
GPS -
Latitude
GPS derived Latitude DDD° MM' SS.SS
GPS -
Longitude
GPS derived Longitude DDD° MM' SS.SS
Station Measurement (Pressure Sensor) 9.3.3
Station Measurement is performed at each Station based on measurement
requirements. The measurement locations can either be structured such in laboratory
environment where the position of the instrument is determined accurately or random
where velocities on channel banks are investigated. The station measurements consist
of collecting a number of different parameters and variables required by the General
mode.
Point Velocity Measurement 9.3.3.1
Point Velocity Measurement in General mode is not bound to any measurement
techniques and or guidelines as required in Discharge mode. The location of the station,
number of point velocity measurements and depth of point velocity measurements is
dependent on the user requirements.
If the velocity measurements are used to perform hydraulic analyzes of the flow
conditions in a channel, either a laboratory or natural channel, it is recommended that
ISO 748 – 2007 guidelines are used.