RRS Challenger CH4/82

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH4/82
Cruise period1982-03-03 — 1982-03-18
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
Objectives1. To lay and recover six current meter stations. The current meter stations will be deployed as soon practicable in order to monitor the rise to the maximum equinoctinal spring tides.
2. Make several (about 5) deployments of the prototype Boundary Layer Instrument Package (BLIP). This is a free fall, acoustically released system which measures the velocity profile in the benthic boundary layer and records bedform movement by stereophotography. The deployments and recoveries are to be made on slack water conditions of the tide, in areas of well defined sand ribbons.
3. Make surveys over the sand ribbons along WNW-ESE tracks were these are located within the area, using side scan sonar and high resolution acoustic profiling.
4. Take closely spaced grab samples of the sediments over selected beforms, and collect several large samples (about 1 cwt) for flume experiments.
5. Record the nature of the bedforms using still photography, especially stereo-photography.
Chief scientistDouglas Hamilton (University of Bristol Geology Department)
Cruise reportRRS Challenger CH4/82 cruise report ch4_82.pdf (0.16 MB) 
Ocean/sea areas 
GeneralCeltic Sea
SpecificS. Celtic Sea
Track chartsRRS Challenger CH4/82 cruise track — trk2695.html RRS Challenger CH4/82 cruise track — trk2695a.html RRS Challenger CH4/82 cruise track — trk2695b.html
Physical oceanography 
Current metersQuantity: number of stations = 6
Description: 240 hours
Geology and geophysics 
Bottom photographyQuantity: number of deployments = 2
Long/short range side scan sonarQuantity: track kilometres = 140
Single channel seismic reflectionQuantity: track kilometres = 140