RRS Discovery D133
Cruise summary report
|Ship name (ship code)||RRS Discovery (74E3)|
|Cruise period||1983-02-22 — 1983-02-27|
|Port of departure||Lisbon, Portugal|
|Port of return||Lisbon, Portugal|
|Objectives||The 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 scientist||J Stuart M Rusby (Institute of Oceanographic Sciences Wormley Laboratory)|
|Cruise report||(0.30 MB)|
|General||North East Atlantic Ocean (limit 40W)|
Strait of Gibraltar (Mediterranean Sea)
|Biology and fisheries|
|Gear research||Description: Midwater trawl, other trawl at 5000m.|
|Routine standard measurements|
|Geology and geophysics|
|Single-beam echosounding||Description: Trial of 3.5 KHZ high resolution reflection seismic sonar|