RRS Discovery D46_leg1
Cruise summary report
|Ship name (ship code)||RRS Discovery (74E3)|
|Cruise period||1972-04-27 — 1972-04-29|
|Port of departure||Barry, United Kingdom|
|Port of return||Barry, United Kingdom|
|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)|
|Track charts||(0.01 MB) (0.02 MB)|
|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.