Surveyor 71/1 Leg 3
Cruise summary report
| Cruise Info. | |
| Ship name | Surveyor |
| Cruise identifier | 71/1 Leg 3 |
| Cruise period | 1971-03-31 — 1971-04-11 |
| Status | Completed |
| Port of departure | Stornoway, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | Tide Gauges - Geology and geophysics on the Hebridean Shelf and on the Rockall Plateau
Aims: 1. To obtain a months continuous tide record on the outer part of the shelf as part of a continuing programme of tide and current observations. 2. To compare the living faunal distribution with that deduced from the biogenic carbonate fraction of the sediments and to investigate the processes involved in its production. Narrative After some initial equipment problems the PES fish was streamed. Surveyor then steamed to the position of tide gauge 2. The gauge was tracked overnight but without success but when the internal pinger was switched on the gauge was located easily and recovered. The ship then proceeded to the site of tide gauge 1 after a period of dragging the tide gauge was recovered. Stations 106 - 184 dredging from St Kilda southwards towards Malin Head. At each station 2 grab samples were normally taken using the 01.1m2 Smith McIntyre grab. If there was shelly material present then the rock dredge was used. Results: 1. 2 tide gauges successfully recovered. 2. Samples of living and dead benthic fauna were obtained from 78 stations. 3. NIO transistored precision-echo-sounder system was used |
| Chief scientist | John B Wilson (National Institute of Oceanography) |
| Cruise report |  (0.77 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) |
| Track charts | (0.06 MB) |
| Measurements | |
| Biology and fisheries | |
| Sediment traps | Quantity: number of stations = 78 Description: bottom sediment samples collected |
| Geology and geophysics | |
| Dredge | Quantity: number of stations = 78 Description: benthic faunal samples taken |
| Grab | Quantity: number of stations = 78 Description: benthic faunal samples taken |
| In-situ seafloor measurement/sampling | Quantity: number of stations = 78 Description: bottom sediment samples collected |
| Multi-beam echosounding | Quantity: number of measurements = 1 Description: acoustic tests |
| Moorings, landers, buoys | |
| Physical oceanography | |
| Other physical oceanographic measurements | 58° 45' 59" N 7° 30' 0" W — tide gauge was recovered from 102m depth. |
| Other physical oceanographic measurements | 58° 3' 59" N 8° 33' 0" W — tide gauge recovered from 49m depth |
