ABSTRACT

The West of Duddon Sands Offshore Wind Farm is located in the Irish Sea off the English coast. The site is currently being developed by a joint venture between Scottish Power Renewables and DONG Energy. During the site maturation phase the interpretation of geophysical survey data revealed localised bedrock cropping out close to seabed in the southern part of the site. This outcropping bedrock influenced the layout of the site and was identified as intrusive igneous rock of Tertiary age. A variety of different site investigation methods were used to identify the intrusive igneous rock, ranging from seismic profiling and magnetic gradiometer to in situ sampling and testing, and onshore laboratory testing. Due to the extensive heat impact of the intrusion, the mechanical properties of the surrounding native rock formation (Mercia Mudstone Group) have been altered. This metamorphic evidence has been detected up to ~250m from the intrusions.

1. General Instructions

The West of Duddon Sands (WDS) Offshore Wind Farm is located in the Irish Sea off the English coast, close to Walney Island (Figure 1). The site is categorised as a Round 2 site by the Crown Estate and is currently being developed by a joint venture between Scottish Power Renewables and DONG Energy. The wind farm is part of an East Irish Sea cluster of offshore wind farms, including Walney (DONG Energy, Scottish and Southern Energy, and OPW), Ormonde (Vattenfall) and Barrow (DONG Energy and Centrica). During the initial feasibility phase, the wind turbines were distributed evenly across the site in a rectangular pattern. However, during the concept development phase, the interpretation of the geophysical survey data revealed localised bedrock cropping out close to the seabed in the southern part of the site. The bedrock was identified as intrusive igneous rock of Tertiary age.

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