9 UNDERWATER NOISE AND VIBRATION AND ELECTROMAGNETIC FIELDS
9.1 Introduction 1.
This chapter first describes the underwater noise modelling carried out by the National Physical Laboratory for the proposed East Anglia THREE project. Comprehensive details are provided in Appendix 9.1. The chapter then describes the potential effects of electromagnetic fields (EMF) of the proposed East Anglia THREE project with reference to work undertaken by the Centre for Marine and Coastal Studies Ltd (CMACS). The original CMACS report is presented as Appendix 9.2 and was commissioned for the proposed East Anglia ONE project. Given that the two projects have comparable project design envelopes in terms of electrical infrastructure, its finding are considered relevant here.
2.
The underwater noise modelling was conducted to provide technical information in support of the fish and marine mammal impact assessments (Chapter 11 Fish and Shellfish Ecology and Chapter 12 Marine Mammal Ecology, respectively). The model describes how noise would propagate in the marine environment and the extent to which this is predicted for the proposed East Anglia THREE project.
3.
The EMF assessment considers the impacts of the operational phase of the proposed East Anglia THREE project only. Information on predicted fields from cables proposed for the proposed East Anglia THREE project, background fields, electromagnetic field detection and potential impacts are presented. This technical information is then utilised in the benthic ecology, and fish and shellfish, impact assessments (Chapter 10 Benthic Ecology, and Chapter 11 Fish and Shellfish Ecology respectively).
9.2 Consultation 4.
Consultation relating to the impact of underwater noise and EMF on benthic ecology, fish and shellfish and marine mammals is reported in Chapter 10 Benthic Ecology, Chapter 11 Fish and Shellfish Ecology and Chapter 12 Marine Mammal Ecology. EMF impacts on marine mammals have not been taken forward for assessment in the EIA, as agreed by Natural England in the first marine mammal evidence plan meeting held on the 13th September 2013 (Appendix 12.1).
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 9 Underwater Noise Page 2
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