Between January 2023 and February 2024, TDI-Brooks performed an intensive website investigation program in two offshore wind blocks in state and federal waters. The tasks concerned surveying in extra of 20,000 line-kms of analogue and both single or multi-channel seismic in lease blocks and cable routes alongside the coasts of New York and New Jersey. Numerous duties have been carried out at completely different phases, corresponding to offshore geophysical surveys, UHRS detailed surveys, archaeological identification surveys, mild geotechnical coring, and benthic sampling.
TDI-Brooks utilized three survey vessels, specifically the Brooks McCall, Miss Emma McCall and Marcelle Bordelon. The geotechnical survey concerned greater than 150 pneumatic vibracores (pVCs) and greater than 150 Neptune 5K cone penetration assessments (CPTs) gathered from each lease areas and alongside the offshore cable route (OCR). Together with a number of export cable route surveys, a reconnaissance survey protecting the whole thing of the lease space with 150-meter spaced survey strains was performed, adopted by a extra detailed archaeological survey with 30-meter spaced strains. Survey sensors together with twin head multibeam sonar, facet scan sonar, sub backside profiler, UHRS seismic, single-channel seismic, and Transverse Gradiometer (TVG) was utilized, all assembly BOEM specs for archaeological surveys.
The targets, decided by the collected information, have been to evaluate the situations of the seabed and sub-seabed, which can embody potential dangers (geohazards or man-made hazards) that might affect the set up of wind generators and subsea cables sooner or later. The investigations performed concerned measuring variations in water depth and slope adjustments, inspecting the morphology (composition of the seabed and lithology within the formations under in relation to native geology), figuring out any pure or man-made obstructions on or under the seabed, corresponding to rock outcrops, channels, depressions, gaseous fluid options, particles (pure or artifical), wrecks, industrial buildings, cables, and so forth., and assessing any shallow geohazards that might have an effect on the websites and future deep geotechnical soil research throughout the high 100 meters beneath the seabed.
