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. |
