Gardline Hydro (a division of Gardline Geosurvey) has been awarded a geophysical survey contract by RWE npower renewables for the Atlantic Array Offshore Wind Farm site in the Bristol Channel.
The company, part of the Gardline Renewables Group specialises in hydrographic surveys and seabed mapping and will carry out a detailed sub-seabed survey to determine the shallow geological features as well as providing topographic imagery of the seabed for both the wind farm area and the export cable route to shoreline.
Gardline has provided a multi-vessel solution to cope with the range of water depths across the site. Two survey vessels, the Tridens 1 and Vigilant, will start work in mid March on the wind farm site where depths vary between 40-60m. They will also survey the export cable route where the water is deeper than 15m. A shallow draft coastal vessel provided by Titan Environmental Survey Ltd will complete the survey of the export cable route up to the shore.
Techniques to be employed will include simultaneous multi beam (swathe) bathymetry, dual frequency side-scan sonar, magnetometer and sub-bottom profiler capable of identifying sediment thickness and basement depths across the survey area. The work is expected to take around two months to complete.