RiverPro and RioPro ADCP Guide
October 2017
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 133
ZS – Vertical Beam Bin Size
Purpose:
Sets the vertical length of the bin, which indirectly sets the volume.
Format:
ZSnnn
Range:
nnn = 2 to 500 cm
Default:
ZS010
Recommended Setting.
The default setting for this command is recommended for most applications.
Description:
The RiverPro collects data over a number of bins. ZS sets the size of each bin in vertical
centimeters.
ZV – Vertical Beam Ambiguity Velocity
Purpose:
Sets the vertical beam radial ambiguity velocity.
Format:
ZVnnn
Range:
nnn = 5 to 700 cm/s
Default:
ZV 250
Recommended Setting.
The default setting for this command is recommended for most applications.
Description:
Set ZV as low as possible to attain maximum performance, but not too low or ambiguity
errors will occur. Rule of thumb: Set ZV to the maximum relative horizontal velocity be-
tween water-current speed and RiverPro speed.
The ZV command (ambiguity velocity setting) sets the maximum velocity that can be
measured along the beam when operating in water mode 2 or 12 (
). ZV is
used to improve the single-ping standard deviation. The lower the value of the ZV com-
mand, the lower the single-ping standard deviation.
Set the ZV command based on the maximum apparent velocity (RiverPro motion plus wa-
ter speed). The following formula is used to determine the setting of the ZV command:
ZV = (Max. Apparent Vel. cm/s) * sin(beam angle) * 1.5, where 1.5 is a safety factor.
Note that the minimum setting of the ZV command is ZV005 and the maximum setting due to
internal processing limitations is limited based on the setting of the
ZV is limited to 330 cm/s in Narrow bandwidth mode (ZB1), which increases the profiling
range by 10% compared to Broad bandwidth mode (ZB0).
When the ZB command is set to ZB0, the max value is ZV700.
In either case, while you can set a value as low as 5 cm/s, this will likely cause ambiguity
errors. TRDI recommends setting ZV to
≥
100cm/s for most applications.
The 1.5 value is a safety factor.
