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Acoustic Doppler Current Profilers (ADCP) were used to measure current speed and direction through the water column
Measurements of the current speed, current direction and water level were analysed to determine the dominant current speed, current direction and water level over the deployment period.
INTRODUCTION
VELOCITY SOFTWARE REAL TIME
SENTINEL V OPERATIONS
Support playback of data collected by VMDAS with GPS referencing (includes support for WH and OS/OO data sets)
Sentinel V Utilities for Real-Time Data Collection.
SOFTWARE
SENTINEL V REAL-TIME UTILITIES:
Sentinel V's latest Real-Time release includes a new software package, Sentinel V Real-Time Utilities, which includes a built-in wizard for those who prefer a step-by-step walk through to deploy your Sentinel V, or it can be bypassed if assistance is not required.
Features include:
Sentinel V Real-Time Utilities Pre Deployment Testing: Using the built-in wizard, or clicking directly on the self-tests allows the user a quick verification and safeguard that the system is ready to go for your real-time deployment.
Real-Time Data Collection Options: The software offers users the ability to collect data through either a built-in terminal emulator, or our long-standing VMDAS software for those that prefer this familiar format.
Post-Processing:
The VMDAS program allows users to both reprocess and playback the data with profile and ship track plots.
The Velocity software program allows users to playback the data with 2D/5D contour and time series plots.
EQUIPMENT
- Aquadopp Profiler 1 MHz
The Aquadopp uses the Doppler effect to measure current velocity by transmitting a short pulse of sound, listening to its echo and measuring the change in pitch or frequency of the echo. You hear the Doppler effect whenever a train passes by - the change in pitch you hear tells you how fast the train is moving.
ADCP DEPLOYMENT
Upon arriving targeted ADCP Station, the ADCP platform was deployed overboard and lowered to seabed manually with 12mm multi-plaited Polypropylene rigging rope.
The rigging rope also doubles up as diver down line (DDL) – either end of rope was attached with sinker weight and float.
As soon as the platform is on seabed, where slack is felt on the DDL, GPS fix is acquired.
Divers decent via the DDL, checked the orientation of the platform to ensure they are upright and making sure that the perimeter rim of the platform base seated square on seabed.
Deactivation magnet on Iridium asset tracking beacon was removed to activate the beacon. Once satisfy, diver releases the DDL and accent via the DDL. Conditions of the dives and observations were recorded in dive logs.
ADCP RECOVERY
Upon arrival at the station, a diver down line (DDL), with surface float and sinker attached to either ends of the line, was deployed. Diver then descends via the DDL and performed underwater search guided by underwater homing transponder.
Once diver located the platform, he attaches the DDL to the frame, performed a quick inspection, and rig up air lift bag.
The air lift bag was then fully filled with air to alleviate the overall submerged weight of the platform, easing surface crew to recovery the asset.
Additional rigging slings were added to the platform when it was at surface to ease hauling the platform onboard.
The platforms were partially disassembled onboard and washed. Recorded data were downloaded onshore prior to demobilizing.
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