115. In terms of number of species within the offshore cable corridor, Hydrozoa were the second most numerous (Diagram 10.12) with Hydractinia echinata being present at 12 of the 16 sample stations. The Hydrozoans were far less dominant in terms of individuals recorded (Diagram 10.11).
10.5.4 Landfall and intertidal Habitat 116. The landfall location for the East Anglia THREE offshore export cable is at Bawdsey cliffs to the south-west of the Martello tower at Bawdsey. During the identification of the most suitable landfall location surveys were conducted at two sites (termed the northern site and the southern site), the results of both of these surveys are presented in section E of Appendix 10.3. The eventual chosen location was the Northern site which was surveyed in August 2011.
117. The predominant habitat at the landfall location was shingle, which is present from the mid to low shoreline. At the southern end of the landfall the shingle runs into larger pebbles and rock higher up the shore. A relatively steep gradient marks the change from the larger pebbles and rocks to vegetated shingle on the high shore, which gradually transitions into an area of trees and shrubs. An area of shingle and sand mix is also present along the high shore. Vegetated shingle runs along the top of the shoreline until it reaches an area of eroding cliff.
118. The Bawdsey cliffs are formed of red crag and London clay. During surveys, clay from the cliff was visible on the shore and had been deposited in some quantity lower on the shore. This had been compacted and was visible at low tide. The compacted clay deposited on the lower shore was covered in Enteromorpha sp., a genus of alga associated with freshwater runoff. Freshwater was noted to be running onto the shore from the cliff face in some areas at this site. Burrow holes were identified in the clay during the survey and the shells of piddocks (bivalve molluscs) Pholas dactylus and Petricola pholadiformis were removed from some (though these were dead). Several grass species were present in the area of Annex I vegetated shingle habitat along with the sea kale (Crambe maritima).
119. Biotope mapping was carried out within the intertidal area using EUNIS and Marine Nature Conservation Review (MNCR) biotope codes and these are displayed in Figure 9.11 Volume 2 of the East Anglia ONE Environmental Statement. The lower shore was described as ‘littoral coarse sediment’ (A2.1) using the EUNIS codes and
LS.LCS.Sh.Bar.Sh (Barren littoral shingle) using the MNCR scheme to provide further description. The upper parts of the shore contained vegetated shingle and are described under EUNIS as ‘upper shingle with open vegetation’ (B2.3).
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 1 Introduction Page 51
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