Dee Experiment mini-STABLE deployment POLRIG944
The mini-STABLE benthic frame was deployed in the Dee Estuary, Liverpool Bay as part of the UK Proudman Oceanographic Laboratory (POL) Dee Experiment . The mooring was deployed at Site WC from 14:34 UTC 13 March 2007 to 08:29 UTC 19 April 2007.
Deployment and recovery information
| Deployment cruise | RV Prince Madog 04_07 |
|---|---|
| Recovery cruise | RV Prince Madog 06_07 |
| Rig latitude (+ve N) | 53.36745 |
| Rig longitude (+ve E) | -3.32335 |
| Water depth (m) | 16.4 |
The mini-STABLE frame was of a tripod design (see image) with the following overall dimensions (all measurements +/- 0.005 m):
| Height : | 1.375 m |
| Separation of legs (top) : | 1.51 m |
| Separation of legs (bottom) : | 2.16 m |
| Front to back : | 1.44 m |
| Height to centre of lowest cross-member : | 1.065 m |
(
Image courtesy of Dr. Richard Cooke, POL (2007)
)
The instrumentation mounted on mini-STABLE during this deployment is detailed in the below table:
| SonTek ADVOcean/Hydra Acoustic Doppler Velocimeter (ADV) comprising logger G258 + probe B233 |
| SonTek ADVOcean/Hydra ADV comprising logger G250 + probe B252 |
| SonTek ADVOcean/Hydra ADV comprising logger G412 + probe B331 |
| POL Acoustic backscatter sensor ABS3 |
| SyncGen3 central timing clock |
| Marine Electronics Sand Ripple Profiling Sonar with external battery pack and adjusted acoustic frequency of 1.1 MHz |
| RD Instruments Workhorse Monitor 1.2 MHz Acoustic Doppler Current Profiler (ADCP) #6489 with external battery pack |
| Sequoia LISST-100ST configured as LISST-100 |
| University of East Anglia (UEA) sediment trap |
The ADVs were mounted at separate heights on a vertical pole with each transmitter axis pointing horizontally, i.e. perpendicular to the sea surface/sea bed. The heights above the bed are as follows:
| Instrument | Height above bed (m) |
|---|---|
| G258 + B233 | 0.3 |
| G250 + B252 | 0.5 |
| G412 + B331 | 0.7 |
