suspended sediment concentrations in the water column) represents an ‘effect’ which may manifest itself as an impact upon other receptors, most notably water quality, benthic ecology, fisheries or navigation (e.g. in terms of increased suspended sediment concentrations or erosion or smothering of habitats on the sea bed).
119. To this end, the assessment presented in this chapter follows two approaches. The first assessment approach is designed for situations where potential impacts can be defined as directly affecting receptors which possess their own intrinsic morphological value. In this case, the determination of significance of the impact is based on an assessment of sensitivity of the receptor (see section 7.4.4.1) and magnitude of effect (see section 7.4.4.2) by means of an impact significance matrix (see section 7.4.4.3).
120. The second assessment approach is designed for situations where effects (or changes) in the baseline marine geology, oceanography or physical processes conditions may occur which could potentially manifest as impacts upon receptors other than marine geology, oceanography and physical processes. In this case, the magnitude of effect is determined in a similar manner to the first assessment method (see section 7.4.4.2) but the assessment of sensitivity of the other receptors and the significance of impacts on those other receptors is made within the relevant chapters of this PEIR pertaining to those receptors.
7.4.3.6 Sensitivity and Value 121. The sensitivity of a receptor is dependent upon its:
Tolerance to an effect (i.e. the extent to which the receptor is adversely affected by a particular effect);
Adaptability (i.e. the ability of the receptor to avoid adverse impacts that would otherwise arise from a particular effect); and
Recoverability (i.e. a measure of a receptor’s ability to return to a state at, or close to, that which existed before the effect caused a change).
122. In addition, a value component may also be considered when assessing a receptor. This ascribes whether the receptor is rare, protected or threatened.
123. The sensitivity and value of discrete morphological receptors have been assessed using expert judgement and described with a standard semantic scale. Definitions for each term are provided in Table 7.11 and Table 7.12. These expert judgements regarding receptor sensitivity are closely guided by the conceptual understanding of
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 27
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