Between January 2023 and February 2024, TDI-Brooks carried out an in depth web site investigation program in two offshore wind blocks in state and federal waters. The initiatives 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. Various duties have been carried out at totally different phases, akin to offshore geophysical surveys, UHRS detailed surveys, archaeological identification surveys, gentle geotechnical coring, and benthic sampling.
TDI-Brooks utilized three survey vessels, particularly 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 exams (CPTs) gathered from each lease areas and alongside the offshore cable route (OCR). Along with a number of export cable route surveys, a reconnaissance survey overlaying everything of the lease space with 150-meter spaced survey traces was carried out, adopted by a extra detailed archaeological survey with 30-meter spaced traces. Survey sensors together with twin head multibeam sonar, aspect 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 knowledge, have been to evaluate the circumstances of the seabed and sub-seabed, which can embody potential dangers (geohazards or man-made hazards) that would impression the set up of wind generators and subsea cables sooner or later. The investigations carried out concerned measuring variations in water depth and slope modifications, analyzing 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, akin to rock outcrops, channels, depressions, gaseous fluid options, particles (pure or artifical), wrecks, industrial buildings, cables, and so on., and assessing any shallow geohazards that would have an effect on the websites and future deep geotechnical soil research throughout the prime 100 meters beneath the seabed.
