Attention:

Please note that operations of the Fishing Echo Sounder Simrad EK 80 requires experienced scientific staff on board and can be only operated on request. The system is not operated by the ship's crew. Request operations with the Fishing Echo Sounder Simrad EK 80 to AWI-Logistics in sufficient time prior to the cruise and clarify the data transfer after the cruise.

Data quality of Fishing Echo Sounder Simrad EK 80 is decreased by operating other Echo Sounders. Repeatable disturbances were detected from simultaneously operating a) POSIDONIA, b) Sonar Doppler Speed Log DOLOG and c) Sediment Echo Sounder Parasound P70. Switch off these Echo Sounders for high data quality.

Summary

The sounder operates several frequencies simultaneously thus allowing to detect fish in different depths.

Manufacturer Kongsberg
Model Simrad EK 80
Serial No. n/a
Type echo sounder
REGISTRY-Link ↪ REGISTRY (8406)


Transducer Frequency:

Contacts

Name Institution Role
Sören Krägefsky Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Engineer In Charge, Principal Investigator, Data Scientist
Alfred Wegener Institute for Polar and Marine Research Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Owner

Components

Subdevices

Name Model Serial Number REGISTRY-Link
F120/200_kHz transducer ES120-7C, ES200-7C n/a ↪ REGISTRY (8414)
F18_kHz transducer ES18-11 transducer 2262 ↪ REGISTRY (8411)
F38_kHz transducer ES38-7 transducer 438 ↪ REGISTRY (8407)
F70_kHz transducer ES70-7C transducer 696 ↪ REGISTRY (8409)
acoustic doppler current profiler and echo sounder EC150-3C transducer 116-ES ↪ REGISTRY (8419)

Position

Infoxyz-position calculated from Alignment Survey Report RV Polarstern (2016), transducers located in box keel, electronics located in E525, computers located in A113
X73.14 m
X-0 is at the center of der rudder (ref. design drawing of the vessel), positive X-axis is forward and along vessel centerline
Y0.022 m
Y-0 at centerline, positive Y-axis is portside
Z0.012 m
Z-0 is set to the lowest point of the keel, positive Z-axis is upwards

Data logging, storage and archiving

Logged parameters

Parameter O2ARegistry Output Type Unit
depth depth m

Central geographical ship's position and time standard

Rawdata storage on board

Dship

Data archiving on land

Calibration

The EK80 system must be calibrated. Ideally, the calibration is executed before and after the measurement in the working area. So, the calibration parameters can be defined dependent the actual water conditions. For this reason a calibration on previous cruises will not lead to optimal results. 

The calibration is performed using three winch systems positioning the calibration sphere below the transducers. 
The winch system as well as their control must operated by the scientists. The laboratory electronic engineer may assist the setup of the system. 

A calibration must be planned like all other scrientific work prior the cruise, because the calibration work needs time. Ideally half a day is requested, but will take longer (may be a whole day), if weather conditions decrease. 
Ideally the calibration is performed in calm sea without wind. If wind forces the drift of the ship, the winches will not hang vertical anymore but will also drift. Under this conditions it is very difficult, to move the calibration sphere to the requested locations. 

Furthermore, the calibration must be planned, because calibration equipment is not permanently on board. The winches etc. need storage capacities and are stored during harbour visit in Bremerhaven, only. 

If you are planning to execute a calibration, please add the that work in formula "Einsatzplanung" and step in contact with schiffskoord@awi.de for further planning. 

Documentation