H-Adcp Wave System Installation Checklist - Teledyne WORKHORSE Operation Manual

WorkHorse H-ADCP Operation Manual

H-ADCP Wave System Installation Checklist

Waves is a feature upgrade for 300 kHz NB H-ADCPs (see
For information on how to use the Waves commands, see the Waves User's Guide.
 System Orientation
Deploy the system pointed into the wave direction as much as possible. If the sys-
1.
tem is in the shadow of the platform it may be challenging to profile outside of it.
2. Waves from the side are acceptable, but not ideal. Waves from the side can be meas-
ured; however the smallest measurable wave specification is different. Waves straight on
might be measurable at 20 cm height, whereas waves from the side may need to be a mini-
mum of 1.5m height.
 Obstructions
1. Avoid obstructions in the beams. Obstructions in the beams (fish, hardware, boats,
thruster wash), may challenge the measurement. If the ADCP can get good profiles, it can
produce both waves and currents results.
To avoid fish problems near the platform, choose range cells that are distant from
o
the platform.
To avoid a fixed obstruction, choose range cells that are short of the obstruction.
o
Obstructing the beams close to the system makes collecting data impossible.
o
The bottom is a fixed obstruction and one must choose range cells that are short
o
of it if deployed in shallow water.
The system is resilient to striking the surface at a grazing angle.
o
A very large sea state will create wave troughs that block the beams if the deployment
o
depth is too shallow.
 Know Your Heading
Confirm that the ADCP heading is valid (not simply pointing at the nearest large piece
1.
of steel.)
If the instrument heading is not correct, a fixed heading can be entered into the soft-
o
ware if the platform heading is relatively fixed.
If the instrument heading is not correct and the platform can rotate to any orienta-
o
tion, then an externally measured heading must be applied.
 Tilts (constant angle not dynamics)
1. The ideal tilt is angled slightly upward (2 to 5 degrees pitch).
2. A level deployment is acceptable.
3. Use Caution if pitched slightly down: this can place the measurement at great depth
making it impossible to measure small or higher frequency waves.
4. Pitch that is greater than 15 degrees is not recommended: this scenario has not been
tested.
5. The roll should be zero for best measurements. Roll less than 10 degrees is acceptable.
Use Caution if roll is greater than 10 degrees: if cells in the right beam are too deep
and cells in the left beam are too shallow the measurement may be compromised.
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Feature Upgrades).
May 2015
Page 25