resource. However, any positive effect must be demonstrated by the completion of studies to professional archaeological standards, and the results produced must be made publicly available.
17.6.2.2 Impact 2: Indirect Impacts 187. The presence of the windfarm array and associated components have the potential to alter the prevailing hydrodynamic and sedimentary regimes of the East Anglia THREE site, resulting in potential indirect impacts upon both known and potential archaeological receptors on or under the sea bed. Such impacts cause effects which afford increased protection to, or deterioration of, archaeological receptors.
188. Impacts resulting in these potential effects during the operational phase include:
Changes to the tidal regime due to the presence of the foundations; Changes to the wave regime due to the presence of the foundations;
Changes to the sediment transport regime due to the presence of the foundations;
Introduction of scour effects due to the presence of the foundations; and Introduction of scour effects due to the exposure of inter-array cables.
189. Changes to the physical baseline environment as a result of the East Anglia THREE site and offshore cable corridor project are assessed as part of Chapter 7 Marine Geology, Oceanography and Physical Processes. Those identified as having an impact upon marine archaeological and cultural heritage receptors are associated with changes to the sea bed morphology due to the formation of scour pits as a result of the presence of foundation structures. The worst case scenario is considered to be associated with the maximum foundation sizes associated with 12MW turbines. Chapter 7 states that changes to sea bed morphology are considered to be of high magnitude near-field. Far-field effects are considered to be negligible. In the absence of scour protection, scour pits may extent a few hundred metres away from each turbine location. As such, it follows that the magnitude of this impact upon archaeological and cultural heritage receptors located near-field to such structures will also be of high magnitude as the formation of scour pits has the potential to expose archaeological material and increase the potential for decay and damage to occur to such receptors.
190. Known receptors assessed as part of this review have been afforded archaeological values ranging between Low to High (section 17.6.1), and are therefore considered
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 17 Offshore Archaeology Page 91
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