Far-field (i.e. the wider area that might also be affected indirectly by the project, e.g. due to disruption of waves, tides or sediment pathways passing through the site).
102. There are three main phases of development that have been considered, in conjunction with the present-day baseline, over the life-cycle of the proposed East Anglia THREE project, namely:
Construction phase (up to 2.5 years duration);
Operation phase (up to 25 years duration and including all operation and maintenance activities); and
Decommissioning phase (up to 2 years duration). 103. A brief description of each phase is summarised in the following sub-sections.
7.4.3.1 Baseline (Pre-existing Conditions) 104. The baseline conditions represent the ranges and interactions of naturally occurring physical processes and morphological responses, both prior to the installation of any windfarm infrastructure and over the lifetime of the windfarm, in the absence of the proposed infrastructure. The baseline also reflects an on-going history of human use of the area for a range of activities principally fishing. Accordingly, the potential effects of natural dynamism and climate change are also considered as part of the baseline conditions. For instance, it is generally anticipated that climate change will result in global scale effects which will be represented at regional scales by rising mean sea level.
7.4.3.2 Construction Phase 105. Impacts upon the hydrodynamic regime, as a consequence of the construction phase, are typically only likely to be associated with the presence of engineering equipment, for example, jack-up barges placed temporarily on site to install 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 days), the consequential effects upon the hydrodynamic regime are deemed to be small in magnitude and localised in both temporal and spatial extent.
106. The greatest potential impacts during the construction phase are likely to be upon suspended sediment concentrations and consequential sediment deposition arising from sea bed disturbance during installation activities or cable laying processes. However, impacts are mainly expected to arise only locally around the source of the
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 24
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