significance level. The foundation types considered included jackets and gravity base structures (GBS).


25.


The principal receptors considered in this assessment included: •


The sensitive coasts within the Study Area;


• Morphological features contained within the offshore EU designated conservation sites;


• Morphological features contained within the coastal EU designated conservation sites; and


• 26.


Non-designated banks located in close proximity to the zone, and which may afford protection to the coast by dissipating wave energy.


These receptors have the potential to be directly affected by changes to the tidal currents and/or changes to the wave regime, or consequent changes to the sediment regime in terms of transport at the bed, transport at the coast and transport within the water column. It is principally the physical disturbance during foundation or cable installation and the physical presence of the foundations that have the potential to interact with physical processes, causing the changes which may affect the receptors.


27.


The findings from this Zonal Cumulative Impact Assessment are presented in Appendix B of this Method Statement. It concluded that the only receptor grouping to which possible significant impacts could occur was the sensitive East Anglia coast. There were, however, recommendations for further investigations to be made at the EIA stage of the changes to the tidal current, wave and sediment regimes. These issues were further investigated specifically for East Anglia ONE project and reported in the accompanying ES for that project.


28.


Chapter 6 of the East Anglia ONE ES (Volume 2 – Offshore) presents an assessment of the potential impacts on the marine physical processes arising from the East Anglia ONE OWF. This assessment is based on a combination of analysis of site data (including Zone-specific and East Anglia ONE project-specific geophysical, geotechnical, benthic and metocean surveys), consideration of the existing evidence base from the construction and operation phases of other OWF, empirical evaluation using industry standard formulae, and detailed numerical modelling using the Delft3D suite hydrodynamic (FLOW), wave (SWAN) and sediment plume (PART) models. Where modelling has been undertaken, it has been used to quantify the impacts in terms of geographical extent and magnitude of change when compared


Phys_Proc_background Sept 2013


East Anglia THREE & East Anglia FOUR Page 8


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