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RRS Challenger CH146
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Challenger (74CH) |
Cruise identifier | CH146 |
Cruise period | 1999-08-17 — 1999-08-27 |
Status | Completed |
Port of departure | Southampton, United Kingdom |
Port of return | Southampton, United Kingdom |
Purpose | Research |
Objectives | A single cruise for the deployment of Autosub AUV in the southern North Sea. Autosub was deployed to survey across the Broken Bank (two main transects). It was equipped with turbulence and current sensors.
Main objective: To measure the spatial variation of flow and turbulence over the sand bank and examine the tidal flow rectification due to topography. Main tasks: 1) Deployment recovery of Autosub AUV; 2) Deployment-recovery of a bottom benthic boundary layer tripod, two pressure gauges, a bottom mounted ADCP; 3) CTD casts; 4) Side-scan sonar survey; 5) Sea bed sampling. |
Chief scientist | George Voulgaris (University of South Carolina Department of Earth and Ocean Sciences) |
Project | Autosub Science Missions Thematic Programme |
Coordinating body | NERC - Autosub Programme Manager, SOC |
Cruise report | (0.67 MB) |
Ocean/sea areas | |
General | North Sea |
Specific | Broken Bank - Norfolk Banks area |
Track charts | |
Measurements | |
Physical oceanography | |
CTD stations | Quantity: number of profiles = 28 Description: CTD casts - 13 stations on August 10, 1999, 15 stations on August 23, 1999. (Using Falmouth Sci. Inc. MCTD-MBP-D). |
Geology and geophysics | |
Grab | Quantity: number of samples = 14 Description: Seabed surface sediment samples, using a Van-veen grab. |
Long/short range side scan sonar | Quantity: track kilometres = 50 Description: Sid-scan survey lines using a dual frequency (114 and 414 KHz) Geoacoustics side-scan sonar. Transects were across Broken Bank. Majority of transects over the same tracks trying to identify bedform movement. |
Moorings, landers, buoys | |
Physical oceanography | |
Transparency (eg transmissometer) | 53° 17' 59" N 2° 12' 0" E — Tripod with 3 cm current meters at 172, 143 and 81 cm above bed, 3-D currents using ADV at 27 cm above bed, pressure (depth and waves), 3 optical backscatter sensors (OBS) at 213, 105 and 52 cm above bed, LISST-100 (particle size analyser 1 um to 250 um) at 205 cm, temperature and conductivity, altimeter. Period of deployment 19-25 August 1999. Depth = 14 m. |
Current meters | 53° 17' 59" N 2° 12' 0" E — Tripod with 3 cm current meters at 172, 143 and 81 cm above bed, 3-D currents using ADV at 27 cm above bed, pressure (depth and waves), 3 optical backscatter sensors (OBS) at 213, 105 and 52 cm above bed, LISST-100 (particle size analyser 1 um to 250 um) at 205 cm, temperature and conductivity, altimeter. Period of deployment 19-25 August 1999. Depth = 14 m. |
Current profiler (eg ADCP) | 53° 15' 59" N 2° 4' 59" E — Upward looking ADCP (broadband) 1600 KHz pressure gauge. Both bottom mounted. Period 19-25 August 1999. Mean depth = 35m. Sampling every 3 min. |
Sea level (inc. bot. press., inverted echosounder) | 53° 17' 59" N 2° 12' 0" E — Tripod with 3 cm current meters at 172, 143 and 81 cm above bed, 3-D currents using ADV at 27 cm above bed, pressure (depth and waves), 3 optical backscatter sensors (OBS) at 213, 105 and 52 cm above bed, LISST-100 (particle size analyser 1 um to 250 um) at 205 cm, temperature and conductivity, altimeter. Period of deployment 19-25 August 1999. Depth = 14 m. |
Sea level (inc. bot. press., inverted echosounder) | 53° 21' 0" N 2° 4' 59" E — Pressure gauge, bottom mounted. Period 19-25 August 1999. Mean depth = 14 m. Sampling every 3 min. |
Sea level (inc. bot. press., inverted echosounder) | 53° 15' 59" N 2° 4' 59" E — Upward looking ADCP (broadband) 1600 KHz pressure gauge. Both bottom mounted. Period 19-25 August 1999. Mean depth = 35m. Sampling every 3 min. |
Instrumented wave measurements | 53° 17' 59" N 2° 12' 0" E — Tripod with 3 cm current meters at 172, 143 and 81 cm above bed, 3-D currents using ADV at 27 cm above bed, pressure (depth and waves), 3 optical backscatter sensors (OBS) at 213, 105 and 52 cm above bed, LISST-100 (particle size analyser 1 um to 250 um) at 205 cm, temperature and conductivity, altimeter. Period of deployment 19-25 August 1999. Depth = 14 m. |
Other physical oceanographic measurements | 53° 17' 59" N 2° 12' 0" E — Tripod with 3 cm current meters at 172, 143 and 81 cm above bed, 3-D currents using ADV at 27 cm above bed, pressure (depth and waves), 3 optical backscatter sensors (OBS) at 213, 105 and 52 cm above bed, LISST-100 (particle size analyser 1 um to 250 um) at 205 cm, temperature and conductivity, altimeter. Period of deployment 19-25 August 1999. Depth = 14 m. |
Data held at BODC | |
Discrete samples | |
4 Autonomous Underwater Vehicle deployment | |
2 Bottom Lander | |
28 CTD frame plus rosette sampler | |
1 Instrument mooring | |
4 PES acoustic towfish | |
18 Side-scan Sonar System | |
15 Van Veen grab |