impacts may occur as a result to changes to the prevailing hydrodynamic and sedimentary regimes caused by the proposed project. The survival of archaeological receptors within the marine environment is dependent upon the chemical, biological and physical processes acting upon them. Any changes to the hydrodynamic regime which alter these processes may impact the survival of archaeological receptors. Alternatively, aspects of the proposed East Anglia THREE project which result in changes to the sedimentary regime may ultimately result in the increased exposure of receptors. Exposure to marine processes may result in the accelerated deterioration of archaeological receptors than those buried within sea bed sediments, thereby causing a negative effect. Conversely, changes to the sedimentary regime may result in increased sediment cover thus affording additional protection to receptors, thereby causing a positive effect.
148. The effect of indirect impacts from changes to the hydrodynamic and sedimentary regimes which lie outside the range of natural variation would be significant.
149. Impacts to the historic seascape character may occur with the introduction of new elements which cause a change in that character.
17.6.1 Potential Impacts during Construction 150. As a result of embedded mitigation, direct impacts to known archaeological receptors would not occur. Unavoidable direct impacts to potential archaeological receptors may occur at any point where development and related activities disturb the sea floor.
151. Increased deterioration of, or protection to, known and potential receptors may occur as a result of changes to the hydrodynamic and sedimentary regimes associated with construction activities.
152. Construction activities may also change the character of the historic seascape as a result of the installation of windfarm components and ancillary structures.
17.6.1.1 Impact 1: Direct Impacts 153. Activities undertaken within the East Anglia THREE site as part of construction works have the potential to directly impact potential archaeological receptors on or under the sea bed resulting in their loss or to disturb relationships between receptors and their wider surroundings.
154. Impacts resulting in these potential effects as part of construction work include:
Sea bed preparation prior to foundation installation (including the deposition of dredged material, particularly associated with the dynamic phase of the
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 17 Offshore Archaeology Page 85
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