Research and service company TDI-Brooks has completed a survey campaign off the coasts of New York and New Jersey.
Between January 2023 and February 2024, TDI-Brooks conducted an extensive site investigation program in two offshore wind blocks in state and federal waters. The projects involved surveying in excess of 20,000 line-kms of analogue and either single or multi-channel seismic in lease blocks and cable routes along the coasts of New York and New Jersey.
Various tasks were carried out at different stages, such as offshore geophysical surveys, UHRS detailed analysis, archaeological identification, light geotechnical coring, and benthic sampling.
TDI-Brooks utilized three survey vessels, namely the R/V Brooks McCall, R/V Miss Emma McCall, and M/V Marcelle Bordelon. The geotechnical survey involved over 150 pneumatic vibracores and ore than 150 Neptune 5K cone penetration tests gathered from both lease areas and along the offshore cable route.
Along with multiple export wire surveys, a reconnaissance study covering the entirety of the lease area with 150-metre spaced lines was conducted, followed by a more detailed archaeological survey with 30-metre spaced lines.
Survey sensors including dual head multibeam sonar, side scan sonar, sub bottom profiler, UHRS seismic, single-channel seismic, and Transverse Gradiometer (TVG) was utilized, all meeting BOEM specifications for archaeological surveys.
The goals were to assess the conditions of the seabed and sub-seabed, which may include potential risks that could impact the installation of turbines and subsea cables.
The investigations involved measuring variations in water depth and slope changes, examining the morphology, identifying any natural or man-made obstructions on or below the seabed, such as rock outcrops, channels, depressions, gaseous fluid features, debris, wrecks, industrial structures and cables, plus assessing any shallow geohazards that could affect the sites and future deep geotechnical soil studies within the top 100 metres of the seabed.