- Resources
- Inventories
- Cruise inventory
- Report
- 3625
RRS Challenger CH87
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Challenger (74CH) |
Cruise identifier | CH87 |
Cruise period | 1991-12-04 — 1991-12-19 |
Status | Completed |
Port of departure | Troon, United Kingdom |
Port of return | Barry, United Kingdom |
Purpose | Research |
Objectives | 1. The measurement of near-bed turbulence, vertical current structure, waves (especially directional spectra) and currents at two sites separated by 10km and aligned with the main tidal stream for a period of 10 days.
2. Determination of wave and current dissipation. 3. Measurement of suspended sediment flux using transmissometers, an acoustic backscatter probe and an array of drogue nets (SEDRIG). 4. The measurement of bedload transport rate and direction using STABLE and fluorescent sand tracers. 5. Determination of 3-D scale and structure of near-bed turbulent bursting events. 6. To observe the response of bedforms to bottom stress resulting from the combined action of waves and tidal currents. 7. Determination of drag partitioning, especially from drag imposed by local bedforms. |
Chief scientist | Jon J Williams (Proudman Oceanographic Laboratory) |
Project | MAST project 0036-C, Linear sandbanks |
Coordinating body | POL |
Cruise report | (0.69 MB) |
Ocean/sea areas | |
General | North Sea |
Specific | Southern North Sea |
Track charts | (0.05 MB) |
Measurements | |
Physical oceanography | |
CTD stations | Quantity: number of stations = 3 Description: Vertical profiles (hourly) obtained over a 13 hour period |
Current meters | Quantity: number of stations = 4 |
Other physical oceanographic measurements | Quantity: number of measurements = 150 Description: Radar measurements of directional wave spectra |
Meteorology | |
Occasional standard measurements | Quantity: number of observations = 136 Description: Met.data (wind speed/direction, wet, dry and sea temp., barometric pressure) |
Geology and geophysics | |
Grab | Quantity: number of samples = 180 Description: samples obtained in the vicinity if fluorescent sand tracer sites |
Single-beam echosounding | Quantity: number of track lines = 50 Description: tracks - PES echo-sounding survey |
Long/short range side scan sonar | Quantity: number of track lines = 50 Description: tracks - side scan sonar survey |
Moorings, landers, buoys | |
Physical oceanography | |
Current meters | 52° 38' 42" N 3° 38' 53" E — S4 and RCM (30m) near bed currents |
Current meters | 52° 39' 5" N 3° 38' 53" E — S4 current meter (3m) - surface flow |
Current meters | 52° 31' 29" N 3° 32' 35" E — S4 and RCM (30m) near bed currents |
Current meters | 52° 30' 54" N 3° 32' 59" E — S4 current meter (3m) - sureface flow |
Current profiler (eg ADCP) | 52° 39' 11" N 3° 39' 5" E — ADCP (30m) vertical current structure |
Current profiler (eg ADCP) | 52° 31' 12" N 3° 31' 41" E — ADCP (30m) vertical current structure |
Instrumented wave measurements | 52° 38' 53" N 3° 39' 5" E — Waverider buoy - 1D spectra |
Instrumented wave measurements | 52° 31' 36" N 3° 31' 54" E — Endico Wave buoy; 2D wave spectra |
Other physical oceanographic measurements | 52° 38' 5" N 3° 38' 48" E — 500kg red fluorescent sand deployed |
Other physical oceanographic measurements | 52° 37' 59" N 3° 37' 59" E — 500kg blue fluorescent sand deployed |
Other physical oceanographic measurements | 52° 32' 5" N 3° 33' 47" E — 500kg red fluorescent sand deployed |
Other physical oceanographic measurements | 52° 32' 30" N 3° 31' 54" E — 500kg blue fluorescent sand deployed |
Other physical oceanographic measurements | 52° 39' 5" N 3° 39' 24" E — Steel STABLE (30m); near bed turbulence; suspended sediments |
Other physical oceanographic measurements | 52° 31' 12" N 3° 32' 17" E — Pop-up STABLE (30m); near bed turbulence; suspended sediments |