Table 7.25Magnitude of effects on suspended sediment concentrations and coastal morphology at the cable landfall under worst case scenario
Location
Near-field Far-field
Scale Low No change Duration
Negligible -
Frequency
Negligible -
Reversibility Magnitude of Effect
Negligible -
Low No change
308. These effects on suspended sediment concentrations and coastal morphology at the cable landfall have the potential to impact directly upon the identified receptor group for marine geology, oceanography and physical processes of the ‘East Anglia’ coast. In terms of its sensitivity and value of this receptor group, the following assessments apply to the magnitude of potential effects that have been identified in Table 7.26.
Table 7.26 Sensitivity and Value assessment for the ‘East Anglia’ coast Receptor
Tolerance
East Anglia coast
Negligible Adaptability Recoverability Negligible Negligible Value Medium Sensitivity Negligible
309. The significance of impact on the ‘East Anglia’ coast from installation of the offshore cable at the landfall is negligible under a worst case scenario.
310. The significance of impacts arising from these effects on other receptors is addressed within relevant chapters of the PEIR.
7.6.2 Potential Impacts during Operation 311. During the operational phase of the proposed East Anglia THREE project, there is potential for the presence of the foundations to cause changes to the tidal and wave regimes due to physical blockage effects, in turn potentially affecting the sediment regime and / or the sea bed morphology. These potential effects are considered as Operation Impacts 1 to 8. In addition, there is potential for the temporary presence of engineering equipment, for example, jack-up barges or anchored vessels to have local effects on the hydrodynamic and sediment regimes during maintenance activities. These potential effects are considered as Operation Impact 9.
7.6.2.1 Impact 1: Changes to the tidal regime due to the presence of foundation structures 312. The presence of foundation structures within the East Anglia THREE site has the potential to alter the baseline tidal regime, particularly in respect of tidal currents and water levels. Any changes in the tidal regime may have the potential to
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 61
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