Acoustic Doppler Current Profiler (ADCP) Neue HTML ohne Position und Images

Attention:

Please note that operations of the Acoustic Doppler Current Profiler requires experienced scientific staff on board. The system is not operated by the ship's crew. Announce operations with the Acoustic Doppler Current Profiler to AWI-Logistics prior to the cruise and clarify the data transfer after the cruise.

Summary

Transducer Frequency:

150 kHz

Responsible Persons

Components

The system consits of the transducer, the electronic chassis, the computer in the echosounder room (G-707) and the subsidiary display at the winch control station (User).
The data acquisition and processing software VmDas and the synchronizing software Easy2Sync are installed on the computer.
The 150kHz transducer is mounted behind an ice protection window and reaches water depth up to 350m with resolution of 4m ("Cell Size" at 1 to 5 kn ship's speed) and accuracy of about 0.30 m/s for a Single-Ping measurement.
The angle between the ship centerline and transducer centerline is 45° direction starboard.

Position

Data logging, storage and archiving

Logged parameters

Central geographical ship's position and time standard

When starting the data acquisition the user set the PC time to UTC. Normally the difference between PC and UTC during the cruise is negligible

GPS of Polarstern is used for the geographical position of the ADCP.

Rawdata storage on board

Mass data: The data acquisition and processing software VmDas creates rawdata on the local drive of the computer.
Every hour the software Easy2Sync copies the data to a local backup file structure.
Every 3 hours the software Easy2Sync synchronizes the backup data to the directory structure of the mass storage.
Attention: Deleting files in the directory structure of the mass storage will also delete these files in the backup file structure with the next synchronization run. But: As long as these files are not removed from the local rawdata drive these files will be copied again to the local backup file structure with the next backup run and to the directory structure of the mass storage with the next synchronization run.

root directory	C:\ADCPData\ or C:\ADCPDataBackup\ or \\polsrv1\data01\ADCP\...
directory name	CruiseNo e.g. ANT25_3
file name	CruiseNoVVV_RRRRRR.ENR CruiseNoVVV_RRRRRR.ENS CruiseNoVVV_RRRRRR.ENX CruiseNoVVV_RRRRRR.LTA CruiseNoVVV_RRRRRR.N1R CruiseNoVVV_RRRRRR.NMS CruiseNoVVV_RRRRRR.STA CruiseNoVVV_RRRRRR.LOG CruiseNoVVV_RRRRRR.VMO with: VVV = version No. RRRRRR = running No. e.g. ANT25_3012_000000.*
Data volume (MB per day) ca	350
Number of files per day ca	35

Dship

Reduced and unevaluated set of measurement data

Device name	ADCP
Parameters	average east velocity [m/s]; average north velocity [m/s]; averaging interval [s]; maximum depth for averaging [m]; minimum depth for averaging [m]; number of measurements used for averaging; true horizontal velocity [m/s]; true velocity direction [°]; up velocity [m/s]

Data archiving on land

After the cruise, the operator transfers the measurement data along with required meta data to AWI after consultaion with the data scientist and AWI Logistics. Then, the data including meta data can be extracted from https://www.pangaea.de/ (for authorized users only). The reduced, unevaluated DShip data set can be extracted from https://dms.awi.de.

File format(s)	See: Handbuch VmDas Quick Start Guide
Calibration certificates	NO

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