RRS Challenger CH74B
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Challenger (74CH) |
| Cruise identifier | CH74B |
| Cruise period | 1991-02-01 — 1991-02-10 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | The objectives of this cruise leg were:
1) To measure waves currents and near-bed turbulence and vertical current structure at two locations off Milford Haven, aligned with the main tidal stream and prevailing swell. 2) To measure the bedforms and suspended sediment concentrations at these stations and over the surrounding area. Both objectives were accomplished. |
| Chief scientist | Judith Wolf (Proudman Oceanographic Laboratory) |
| Cruise report |  (0.60 MB) |
| Ocean/sea areas | |
| General | Bristol Channel Celtic Sea |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: activity duration in days = 8 |
| CTD stations | Quantity: number of profiles = 68 |
| Transparency (eg transmissometer) | Quantity: activity duration in days = 8 Description: surface underway |
| Transparency (eg transmissometer) | Quantity: number of profiles = 68 |
| Current meters | Quantity: number of stations = 4 Description: 4 cm deployed, 3 recovered |
| Other physical oceanographic measurements | Quantity: number of observations = 73 Description: (captures) ships radar measurements of wave spectra (under development) |
| Other physical oceanographic measurements | Quantity: number of image series = 48 Description: (films) ships radar measurements, photographic technique |
| Meteorology | |
| Routine standard measurements | Quantity: activity duration in days = 7 Description: hourly meteorological data recorded from ship |
| Geology and geophysics | |
| Grab | Quantity: number of samples = 48 Description: for grain size analysis |
| Core - soft bottom | Quantity: number of cores = 3 Description: sand over mud |
| Single-beam echosounding | Quantity: activity duration in days = 10 Description: echosounder every 10secs for 10 days |
| Moorings, landers, buoys | |
| Physical oceanography | |
| Current meters | 51° 30' 0" N 4° 45' 6" W — S4 current meter, 4m below surface, deployed, missing so not recovered (A4) |
| Current meters | 51° 30' 0" N 4° 45' 24" W — S4 current meter, 4m above bottom, deployed and recovered (A5) |
| Current meters | 51° 34' 5" N 4° 30' 17" W — S4 current meter, near bottom, deployed and recovered (B5) |
| Current meters | 51° 33' 47" N 4° 30' 29" W — S4 current meter, near-surface, deployed and recovered (B4) |
| Current profiler (eg ADCP) | 51° 34' 12" N 4° 30' 0" W — Sea floor ADCP, deployed and recovered (B3) |
| Current profiler (eg ADCP) | 51° 29' 53" N 4° 44' 35" W — Sea floor ADCP, deployed and recovered (A3) |
| Sea level (inc. bot. press., inverted echosounder) | 51° 29' 53" N 4° 44' 35" W — Bottom water level recorder, deployed and recovered (A3) |
| Sea level (inc. bot. press., inverted echosounder) | 51° 34' 12" N 4° 30' 0" W — Bottom water level recorder, deployed and recovered (B3) |
| Instrumented wave measurements | 51° 33' 35" N 4° 29' 35" W — Waverider, frequency spectra, deployed and recovered (B2) |
| Instrumented wave measurements | 51° 29' 48" N 4° 45' 6" W — WAVEC, deployed and recovered (A2) |
| Other physical oceanographic measurements | 51° 30' 6" N 4° 45' 6" W — STABLE II, turbulence meaasurements, currents and pressures (A1) |
| Other physical oceanographic measurements | 51° 34' 0" N 4° 30' 0" W — STABLE I,turbulent currents/pressure,acoustic suspended seds,sea-bed camera(B1) |
| Meteorology | |
| Other meteorological measurements | 51° 29' 35" N 4° 45' 29" W — Met. Buoy, deployed and recovered (A6) |
| Data held at BODC | |
| Discrete samples | |
| 62 CTD frame plus rosette sampler | Transmittance and attenuance of the water column Salinity of the water column Temperature of the water column Density of the water column |
