remainder of the deployment schedule. This change of specification was accepted by EAOW and from deployment 3 onwards the new instrumentation was used.


2.5 Multibeam Surveys Multibeam surveys of the AWAC site were undertaken before deployment and following final recovery of the equipment. The Kongsberg Maritime AS EM3002D system aboard RV Cefas Endeavour was deployed on a drop keel. It was used to map the geophysical features of the sea floor in Kongsberg’s acquisition software SIS and the data was post‐processed in Caris version 7.1. Depth has been tidally corrected using the C‐NAV Precise Point Positioning service. Kinematic tidal height was extracted and reduced to chart datum using the UKHO Vertical Offset Reference Frame (VORF) model. Results from the both the December 2012 (pre‐deployment) and December 2013 (post‐ recovery) are detailed in section 3.5.


2.6 Deployments and Recoveries The Waverider was deployed and recovered with reference to the Datawell Waverider manual, the appropriate Cefas Standard Operating Procedure (SOP) and Cefas Risk Assessments (RA). A large Cefas Guard Buoy, fitted with efficient Echomax radar reflector and yellow navigation light with greater than three nautical mile range and flashing five times every 20 seconds, was positioned near to the Waverider as part of the deployment.


The MiniLander was deployed and recovered with reference to the appropriate Cefas SOP and Cefas RA. Two large Cefas Guard Buoys (as described above) were positioned near to each Lander as part of the deployment.


2.7 Sediment and Water Sampling Methods On deployment and recovery of the equipment three replicate seabed sediment grab samples of at least 1 kg each were taken in close proximity of the MiniLander site (as appropriate to conditions at the time) to determine sediment type and be suitable for particle size analysis.


These sediment samples were collected using an industry standard Day grab. Once on board the vessel the samples were transferred into suitable closed containers and marked up with sample details such as date, time and location and stored in a cool location or freezer. Upon return to Cefas Lowestoft laboratory, the samples were stored in a freezer before being analysed using agreed protocols.


EAST ANGLIA THREE – CEFAS FINAL TECHNICAL REPORT Page 9 of 82


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