RRS Challenger CH4/82
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Challenger (74CH) |
| Cruise identifier | CH4/82 |
| Cruise period | 1982-03-03 — 1982-03-18 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | 1. 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 scientist | Douglas Hamilton (University of Bristol Geology Department) |
| Cruise report |  (0.16 MB) |
| Ocean/sea areas | |
| General | Celtic Sea |
| Specific | S. Celtic Sea |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Current meters | Quantity: number of stations = 6 Description: 240 hours |
| Geology and geophysics | |
| Bottom photography | Quantity: number of deployments = 2 |
| Long/short range side scan sonar | Quantity: track kilometres = 140 |
| Single channel seismic reflection | Quantity: track kilometres = 140 |
