Table 7.10 Data Sources Data
Year
Geophysical Survey
Geophysical Survey
Oct 2010
June – Sept 2012
Coverage
East Anglia Zone (partial)
Confidence Notes High
East Anglia THREE site High
High-resolution swath bathymetric survey.
High-resolution sea bed bathymetry, sea bed texture and morphological features, and shallow geology using multi- beam echo sounder, side-scan sonar and sparker and pingers.
Geophysical Survey
July - Oct 2012
Aug – Sept 2014
East Anglia THREE / FOUR cable corridor
(additional survey in 2014 to widen the cable corridor at a known pinch point)
Geophysical Survey
Oct 2011 - Feb 2012
East Anglia ONE cable corridor (including shared inshore section with East Anglia THREE / FOUR)
Metocean Survey
Dec 2012 – Dec 2013
East Anglia THREE site
High High
High-resolution sea bed bathymetry, sea bed texture and morphological features, and shallow geology using multi- beam echo sounder, side-scan sonar and sparker and pingers.
High-resolution sea bed bathymetry, sea bed texture and morphological features, and shallow geology using multi- beam echo sounder, side-scan sonar and sparker and pingers.
High
Acoustic Wave and Current (AWAC) meter and Directional Wave Rider (DWR) buoy deployed
Sediment grab samples Water samples Turbidity measurements
Metocean Survey
ADCP Spring tidal data
ADCP Neap tidal data
Grab Sample Survey
Grab Sample Survey
Jan 2011 – Jan 2012
September 2013
July 2013
September 2010 to January 2011
April – May 2013
East Anglia ONE site (for wider context)
High East Anglia THREE site High East Anglia THREE site High East Anglia Zone High
Directional Wave Rider (DWR) buoy deployed
Tidal velocity and direction through the water column
Tidal velocity and direction through the water column
Grab samples at selected sites (48 no. within the proposed East Anglia THREE site)
East Anglia THREE site and offshore cable corridor
Preliminary Environmental Information May 2014
High
Grab samples (5 no. within the windfarm site and 47 no. within offshore cable corridor)
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 22
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