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The energy transition presents new opportunities for offshore infrastructure development, including power generation and transmission. Development sites are mostly restricted to shallow shelf environments but are increasingly moving to deeper water beyond the continental shelf, presenting different challenges. Little is often known about the seabed ground conditions and geohazards at the early stages of site development such that early acquisition and interpretation of bathymetry and geophysical data are essential to ensure that developments are not exposed to significant geohazard risk. We present an integrated geological and geophysical approach, combining bathymetry, boomer and chirp geophysics, and geotechnical data to characterise ground conditions along a c.250km HVDC transmission cable for an energy transition project. We document a range of potential geohazards and solutions and demonstrate that an integrated assessment has considerable benefits to identify and manage geohazards through concept, design and installation project stages, thereby reducing the geohazard risk to sub-sea infrastructure.
Rouse et al. (Wed,) studied this question.