Project: A2953 Client: East Anglia Offshore Wind Limited Title:


Navigation Risk Assessment – East Anglia THREE Offshore Windfarm


www.anatec.com


TABLE OF CONTENTS 1


SCOPE OF THE ASSESSMENT AND METHODOLOGY ..................................................... 1 2 REGULATIONS AND GUIDANCE ............................................................................. 2


1.1 1.2


3 PROJECT DESCRIPTION ............................................................................................ 3 3.1


3.2 3.3


INTRODUCTION ........................................................................................................... 3 EAST ANGLIA THREE BOUNDARY ............................................................................ 3 STRUCTURE DETAILS ................................................................................................. 4 3.4 OFFSHORE CABLE CORRIDOR ..................................................................................... 9


4 EMBEDDED MITIGATION ........................................................................................ 10


5 MARINE NAVIGATIONAL MARKINGS ................................................................ 13 5.1


5.2


INTRODUCTION ......................................................................................................... 13 CONSTRUCTION/DECOMMISSIONING ........................................................................ 13


5.3 MARKING OF INDIVIDUAL STRUCTURES ................................................................... 13 5.4 5.5


7 EXISTING ENVIRONMENT ...................................................................................... 23 7.1


7.2


PROPOSED MARKINGS .............................................................................................. 14 SUPERINTENDENCE AND MANAGEMENT ................................................................... 14


6 CONSULTATION ......................................................................................................... 15


INTRODUCTION ......................................................................................................... 23 IMO ROUTEING MEASURES ..................................................................................... 23


7.3 NAVIGATIONAL AIDS ............................................................................................... 24 7.4 7.5


CHARTED ANCHORAGE AREAS ................................................................................ 25 PORTS ....................................................................................................................... 25


7.6 OIL & GAS INFRASTRUCTURE .................................................................................. 26 7.7 MOD EXERCISE AREAS AND EXPLOSIVES DUMPING GROUNDS – WATER BASED ... 29 7.8 MARINE AGGREGATES DREDGING AREAS................................................................ 30 7.9


CORRIDOR ............................................................................................................................. 32 7.10 MEHRAS ................................................................................................................. 32 7.11 SHIP TO SHIP TRANSFERS ......................................................................................... 34


8 METOCEAN DATA ...................................................................................................... 36


8.1 WIND ........................................................................................................................ 36 8.2 WAVE ....................................................................................................................... 37 8.3 VISIBILITY ................................................................................................................ 37 8.4 8.5 8.6


Date: Doc:


07.05.2014 A2953 East Anglia THREE NRA Appendix 15.1 Page: ii SUBMARINE CABLES WITHIN THE EAST ANGLIA THREE SITE AND OFFSHORE CABLE


INTRODUCTION............................................................................................................ 1 BACKGROUND ............................................................................................................ 1


TIDE ......................................................................................................................... 38 POTENTIAL EFFECTS ON WAVES AND TIDAL STREAMS ............................................ 38 SEDIMENTATION/SCOURING IMPACTING NAVIGABLE WATER DEPTHS IN AREA ...... 38


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