Cruise inventory

RRS Challenger CH38

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH38
Cruise period1988-10-27 — 1988-10-31
StatusCompleted
Port of departureGreat Yarmouth, United Kingdom
Port of returnGreat Yarmouth, United Kingdom
PurposeResearch
Objectives1. To survey a preselected area of sand waves, using sidescan sonar and echo-sounding, in order to assess the homogeneity of the sand wave field in the area, select a site for STABLE deployments, and provide bottom topography for planned numerical models.
2. To deploy two POL pressure sensors, separated by 10km across the sand waves, to measure sea surface slopes. These were to be recovered one month later during cruise 40.
3. To deploy the bottom tripod STABLE, to measure turbulence and currents at the seabed, along with suspended sediment concentrations, pressure and seabed topography by bottom photography. STABLE was to be recovered at the end of cruise 38.
4. To run Acoustic Doppler Current Profiler (ADCP) surveys over as many tidal cycles as possible between the pressure sensors, to obtain mid-water current profiles.
5. To collect seabed surface samples using a Shipek Grab, to characterise the bed grain roughness at different locations over a sand wave profile.
Chief scientistDavid Huntley (Polytechnic South West Institute of Marine Studies)
ProjectNERC North Sea Project
Coordinating bodyNERC
Cruise reportRRS Challenger CH38 cruise report ch38_88.pdf — access key 'C' (0.34 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificSouthern North Sea
Track chartsRRS Challenger CH38 cruise track — ch38_88track.pdf (00 MB) 
Measurements 
Physical oceanography 
Current profiler (eg ADCP)Quantity: track kilometres = 555.6
Description: Acoustic Doppler Profiles,diskette
Geology and geophysics 
GrabQuantity: number of deployments = 11
Single-beam echosoundingQuantity: track kilometres = 250
Long/short range side scan sonarQuantity: track kilometres = 148.16