effect and persist for short time scales (order of hours to days) during the construction period.
7.4.3.3 Operation Phase 107. Impacts upon the hydrodynamic and sediment regimes as a consequence of maintenance activities during the operation phase are typically only likely to be associated with the presence of engineering equipment, for example, jack-up barges or anchored vessels placed temporarily on site to maintain the wind turbine structures. As such, equipment is only likely to be positioned at one site at a time for a relatively short duration (of the order of hours to days), the consequential effects upon the hydrodynamic regime are deemed to be low in magnitude being localised in both temporal and spatial extent.
108. The greatest potential impacts during the operation phase are likely to be associated with the physical presence of the wind turbine foundation structures throughout its operational life-cycle. The East Anglia THREE site covers approximately 305km2 of sea bed within which the wind turbines would be installed. During the operational phase, effects due to the presence of the foundation structures have the potential to be larger in magnitude and in temporal and spatial extents than during other phases of the proposed East Anglia THREE project life-cycle.
109. Potential effects on the tidal regime associated with the presence of the foundations may include changes to the naturally occurring patterns of tidal water levels, current speeds and directions.
110. Potential effects on the wave regime associated with the presence of the foundations may include changes to the naturally occurring wave heights, periods and directions.
111. Potential effects on the sediment regime associated with the presence of the foundations may occur as a result of the changes to the tidal and wave climate, as described above, potentially manifesting as:
The alteration of suspended and / or bed load sediment transport pathways within both the near- and far-fields;
Scour around the wind turbine foundations and / or the cables, with the potential for the eroded material to be transported away from the East Anglia THREE site; and
Changes to the sediment transport processes along adjacent coastlines due to landfall of the offshore cable.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 25
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