RRS Discovery D133

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD133
Cruise period1983-02-22 — 1983-02-27
Port of departureLisbon, Portugal
Port of returnLisbon, Portugal
ObjectivesThe purpose of the cruise was to test deck equipment and new warps near the start of the annual cruise period, to develop handling techniques and to fish 'midwater' and trawl nets at oceanic depths, and to test certain new instruments and their associated telemetry including applications of the near bottom echo sounder or altimeter systems at sea. The tasks undertaken included:
1. Trial deployment of the new 3-strand tapered warp to 5000 metres using a 2-ton weight as end load.
2. Deployment and operation of the RMT 1+8 multiple net system at 5000 metres.
3. Deployment and operation of the OTSB 14 otter trawl at 5000 metres.
4. Testing of monitors plus near-bottom echo sounders fro the RMT 1+8M net and towed survey camera.
5. Trial of the 3.5 kHz high resolution seismic reflection sonar.
6. Trial of the precision echo-sounder tracker (PEST).
7. Trial of the sonar platform and side-scan sonar.
8. Development and testing of geophysics programmes for the PDP 11/34 computer system.
Chief scientistJ Stuart M Rusby (Institute of Oceanographic Sciences Wormley Laboratory)
Cruise reportRRS Discovery D133 cruise report d133.pdf (0.30 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Strait of Gibraltar (Mediterranean Sea)
SpecificNorth Atlantic
Track chartsRRS Discovery D133 cruise track — trk3174.html
Biology and fisheries 
Gear researchDescription: Midwater trawl, other trawl at 5000m.
Routine standard measurements
Geology and geophysics 
Single-beam echosoundingDescription: Trial of 3.5 KHZ high resolution reflection seismic sonar