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2005, EMU Ltd, Lincs Offshore Wind Farm, Geophysical Survey

2005, EMU Ltd, Lincs Offshore Wind Farm, Geophysical Survey

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Geophysical

Description

EMU Ltd was commissioned by Centrica Energy Ltd to undertake a preliminary geophysical survey over the Lincs wind farm site in the offshore area between Wash and Humber. The entire survey covered a total area of approximately 34.5 square kilometres. The survey was commissioned to meet two main objectives: 1) To identify the thickness of sediment units and depth to rockhead; and 2) To identify the positions of possible ferrous debris.  In order to meet these requirements the following data were collected:
• Seismic data to provide information on the sub-surface geology and thickness of
surficial sediments
• Bathymetric soundings to determine seabed topographic variations and to reduce
seismic data to datum
• Magnetometer data to determine the position and size of ferrous objects
The collection of survey data was undertaken between 3rd February and 5th February 2005
utilising a vessel called ‘Kirkspray’.
A comprehensive set of data was collected throughout the survey site. The bathymetry data
indicate that the seabed slopes gently from 10m below Chart Datum (CD) in the northwest
corner, towards the southeast to a maximum depth of 30m below CD.
Underlying less than 1m of surface sediments are glacial tills, which form a generally uniform
horizon. This top horizon, thought to be ablation till, has been divided locally into the Upper
Sedimentary Unit (USU) and the Lower Sedimentary Unit (LSU). The total thickness of these
units ranges from 5 to 13m with the greater values found in the north east of the survey area.
The base of the Sediment Units/top of the underlying chalk is not a distinct horizon due to the
fact that the top of the chalk is heavily weathered. Therefore, a change in the character of the
seismic records rather than a distinct reflector has been mapped and is likely to coincide with
the weathered zone at the top of the bedrock.
The magnetometer data indicate that there are several small ferrous objects on the site.

Dataset

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Bathymetric Soundings

Seismic Data

Bathymetric Contours

Magnetometer Targets

Reduced Depth to Rockhead

Seismic Point Data 1

Seismic Point Data 2

Tidal Data

Report

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Report

Figures