ABSTRACT
This case describes a geophysical survey commissioned as part of the ground investigation for a provisional landing location for cables associated with an offshore wind farm. The survey objective was to provide information on ground conditions and subsurface geology, to assess the suitability of horizontal directional drilling. The survey area comprises a shingle beach, cliff line, a gently sloping grassed area, and a stubble field. P- and S-wave seismic refraction was used to determine seismic velocities to infer rock characteristics. This was combined with multichannel analysis of surface waves (MASW) used to derive S-wave velocity. The geophysical survey has provided a non-invasive means for investigating the subsurface with high spatial coverage, and data analysis has provided information to assist with the bulk characterisation of the shallow subsurface and has identified distinct seismic velocity layers. The case includes practical survey and planning considerations along with examples of interpretations and results.
