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RRS Discovery D46_leg1
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Discovery (74E3) |
Cruise identifier | D46_leg1 |
Cruise period | 1972-04-27 — 1972-04-29 |
Status | Completed |
Port of departure | Barry, United Kingdom |
Port of return | Barry, United Kingdom |
Purpose | Research |
Objectives | Leg 1 of 3 of D46
1) An assesment of the telesounder. This is a side-scan sonar with many loads produced by an interferometer arrangement, and is intended as a tool to allow the bathymetric survey of a swathe of sea bed 400 to 500m wide in shallow water. The device used on this cruise was an experimental 'lash-up' to allow an investigation of the potentialities and problems. 2) Observations were made with a 36 kHz Side-scan sonar on the sea bed. 3) Set up of the new software system for the shipbourne computer |
Chief scientist | M J Tucker (National Institute of Oceanography) |
Cruise report | (0.99 MB) |
Ocean/sea areas | |
General | Bristol Channel |
Specific | Horshoe Rocks |
Track charts | (0.01 MB) (0.02 MB) |
Measurements | |
Meteorology | |
Occasional standard measurements | |
Geology and geophysics | |
Multi-beam echosounding | Quantity: 250 Description: Echos were obtained out to almost 250m |
Long/short range side scan sonar | Quantity: number of hauls = 50 Description: Records were obtained in depths down to about 50m. The signal from the telesounder was fed into the Side-scan sonar receiver, which included TGV circuits and whose bandwidth was temporarily modified to handle the shorter ().4mS) telesounder pulses. An external wide-band marking amplifier was then used to display signals on the 11" Mufax recorder and which triggered a pulse in the normal way. |