•


Pre-existing published literature and available data - A large volume of published work and numerous available datasets exist relating to the baseline tidal, wave and sediment regimes and morphological features within the seabed and adjacent coastlines of the southern North Sea. This was collated and comprehensively reviewed as part of the ZEA;


• Metocean, geophysical and benthic surveys collected from the Zone and the Development Area of project EA ONE (Note: the IMO Deep Water route that runs north-south through the Zone was not surveyed originally but survey has been undertaken in 2013); and


• Numerical modelling of baseline tidal flow patterns.


20. Appendix 6.2 of the East Anglia ONE OWF Environmental Statement (Volume 2 – Offshore) then further developed this baseline characterisation of physical processes specific to the East Anglia ONE OWF site and cable corridor. This information is summarised within Chapter 6 of the East Anglia ONE OWF ES.


21.


Key information derived from these previous assessments of relevance to East Anglia THREE and FOUR is presented in Appendix A of this Method Statement.


2.1.4 Assessment of Effects


2.1.4.1 Previous Assessments 22.


Considerable previous work has been undertaken within the East Anglia Zone and specifically for the East Anglia ONE project to assess the potential effects of offshore wind farms on the physical marine environment.


23.


Chapter 5 of the East Anglia ZEA presents the Zonal Cumulative Impact Assessment for physical processes, based on a ‘Source-Pathway-Receptor’ conceptual model. It considered the potential for changes to occur both within the Zone and across the wider physical processes Study Area which covers the seabed of large areas of the Southern North Sea and the adjacent shores of the UK and mainland Europe.


24.


The assessment was undertaken using expert judgment, based upon an understanding of tidal excursion, sediment mobility and sediment transport pathways established through detailed baseline studies. It was also informed using an evidence-base established from ES chapters and post-construction modelling associated with operational OWF developments. The assessment process considered issues such as the magnitude of effect, the sensitivity of the receptor, the value of the receptor and the degree of interaction to determine a regional


Phys_Proc_background Sept 2013


East Anglia THREE & East Anglia FOUR Page 7


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