FRV Alba Na Mara 1413A
|Ship name (ship code)||FRV Alba Na Mara (74NM)|
|Cruise period||2013-10-16 — 2013-10-21|
|Port of departure||Fraserburgh, United Kingdom|
|Port of return||Fraserburgh, United Kingdom|
1. To test and compare a variety of TV and HD cameras and associated lights.
2. To test and calibrate the alignment of laser stripe projectors.
3. To assess a commercial 3-D laser imaging system (Savante Ltd) and underwater instrumentation (Heel & Pitch sensor).
4. To test the deployment, recovery and efficiency of short-base-line acoustic positioning systems and a "pop-up" recovery marker using a hydrophone mounted on the port-side transducer pole.
5. To calibrate plankton-sampler flow-meters.
6. Staff training in the deployment, operation and recovery of a VideoRay ROV.
Scientific equipment will be transported to Fraserburgh on 15 October. The TV cable will be loaded on to the winch and deck equipment set-up. If necessary, set-up will be completed when staff join Alba na Mara during the morning of 16 October, after which TV trials will start in the Moray Firth in areas of sandy sea-bed and 100m depth. Alba na Mara will return to Fraserburgh at the end of each day during the survey to exchange staff and to review data.
Trials of the short-base-line system will proceed as weather permits, using the port-side transducer-pole with attached hydrophone to locate a sea-bed target (drop-frame). An acoustic "pop-up" recovery marker will be attached to the drop-frame to assess its suitability as an aid to recovering lost equipment. Other instrumentation will be tested on the drop-frame as conditions permit. Various laser projectors will be tested to calibrate and verify the beams, and a commercial 3-D laser imaging system will be deployed to assess its suitability for benthic impact studies. Staff training in the deployment and use of the Video Ray ROV will be undertaken while the vessel is at anchor in sheltered waters. The flow-meters will be calibrated by towing at a range of fixed speeds in reciprocal directions
After the trials, Alba na Mara will un-load equipment in Fraserburgh on 21 October. The 300m armoured cable will be left on the TV winch in preparation for survey 1813A. Normal contacts will be maintained with the Laboratory.
|Chief scientist||Chris D Hall (Marine Scotland Aberdeen Marine Laboratory)|