RRS Challenger CH4/83

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH4/83
Cruise period1983-02-25 — 1983-03-08
Port of departureFalmouth, United Kingdom
Port of returnFalmouth, United Kingdom
ObjectivesThe general aim is to relate sediment distribution and the nature of bedforms to hydraulic parameters meaasured in the benthic boundary layer.
During this cruise, 6 current meter moorings were laid to record boundary layer currents, 73 sediment samples recovered, miles of side scan sonar survey, with 17 successful photographic (mono, stereo and cine) and TV stations.
Chief scientistDouglas Hamilton (University of Bristol Geology Department)
Cruise reportRRS Challenger CH4/83 cruise report ch4_83.pdf (0.03 MB) 
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
North East Atlantic Ocean (limit 40W)
SpecificCeltic Sea
Track chartsRRS Challenger CH4/83 cruise track — trk2861.html
Physical oceanography 
BathythermographQuantity: number of profiles = 5
Current metersQuantity: number of deployments = 14
Description: 187 hours;part by vertical gradient unit
Geology and geophysics 
GrabQuantity: number of samples = 73
Description: physical analysis of sediments
Bottom photographyQuantity: number of deployments = 12
Description: time lapse cine camera,mono camera,stereo camera,video camera
Single-beam echosoundingQuantity: track kilometres = 500
Long/short range side scan sonarQuantity: track kilometres = 926
Description: ms47ap.;also 270nm using dual scan
Single channel seismic reflectionQuantity: track kilometres = 105
Other geological/geophysical measurementsQuantity: number of deployments = 5
Description: motion picture of sea floor