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2007, Gardline Geosurvey Limited, Sheringham Shoal Offshore Wind Farm, Seismic Survey

2007, Gardline Geosurvey Limited, Sheringham Shoal Offshore Wind Farm, Seismic Survey

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Geophysical

Description

Gardline Geosurvey carried out an ultra high resolution seismic survey for SCIRA-Norsk
Hydro on the Sheringham Shoal off the North coast of Norfolk, UK. The object was to
investigate the depth to the top of the Chalk and the stratigraphy of the Quaternary
sediments, and furthermore determine any hazards and/or constraints to the
emplacement of the 88 to 108 proposed wind turbines for the Scira Windfarm, using
single beam and multi-beam echo sounder, sidescan sonar, pinger, boomer and mini
airgun equipment. Positioning control for the survey was the Fugro Starfix and Subsea7
Veripos DGPS services.
The scope of work, as defined by the contract, called for seabed and geological
information with which to identify hazards and constraints to aid in the planning of a
geotechnical borehole campaign later in 2007; planning and engineering of piles for the
foundations of the turbines; and, finally, to aid the detailed design of the turbine grid and
positioning of support installations. Particular emphasis was placed on identifying the top
of the Chalk within the survey area.
The survey was conducted over a site that has a rhombic shape oriented with the outer
long side following the 12nm boundary. The long sides and the short sides are
approximately 7.65km and 6.47km respectively.
The Sheringham Shoal Windfarm Site is located approximately 17km to 23km offshore
from the North Norfolk coastal town of Sheringham and approximately 5km north of the
offshore sand bank known as Sheringham Shoal.
The survey line grid was completed as planned.
The following contractor and client representatives were present on board the survey
vessel.
Gardline Party Chief J Bulstrode
Norsk Hydro Representative R Lien, H Johansen, S Eidsvig
Fisheries Representative J Lingwood
This report describes the seafloor conditions and the geology around the Sheringham
Windfarm site. Potential installation hazards have been evaluated and special attention
has been given to the following:
• Presence and distribution of shallow gas
• Existence of boulders
• Seabed features, such as sand waves, cables, wrecks, items of debris, etc.
• Shallow stratigraphy and lithology
• Identification of the top of the weathered Chalk.

Dataset

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Bathymetric Contours

Seismic Results Examples

Geological Layers below seabed (XLS)

Geological Layers below seabed (SURFER)

Report

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Interpretation report

LINES NH0778-459 AND NH0778-460ALIGNMENT SHEETS 1 TO 5

LINES NH0778-457 AND NH0778-458

LINES NH0778-455 AND NH0778-456ALIGNMENT SHEETS 1 TO 5

LINES NH0778-453 AND NH0778-454ALIGNMENT SHEETS 1 TO 5

LINES NH0778-451A AND 452ALIGNMENT SHEETS 1 TO 5

LINES NH0778-401 AND NH0778-402AALIGNMENT SHEETS 1 TO 4

LINES NH0778-403 AND NH0778-404ALIGNMENT SHEETS 1 TO 4

LINES NH0778-405 AND NH0778-406ALIGNMENT SHEETS 1 TO 4

LINES NH0778-407 AND NH0778-408AALIGNMENT SHEETS 1 TO 4

LINES NH0778-409A AND NH0778-410ALIGNMENT SHEETS 1 TO 4

Field Report

LINES NH0778-411 AND NH0778-412ALIGNMENT SHEETS 1 TO 4

LINES NH0778-413 AND NH0778-414ALIGNMENT SHEETS 1 TO 4

LINES NH0778-415 AND NH0778-416ALIGNMENT SHEETS 1 TO 4

LINES NH0778-417 AND NH0778-418ALIGNMENT SHEETS 1 TO 4

LINES NH0778-419A AND NH0778-420ALIGNMENT SHEETS 1 TO 4

LINES NH0078-463A AND NH0778-464ALIGNMENT SHEET 1 TO 5

REFERENCE POINT TRACK AND CHART AREAS

BATHYMETRY Chart

SEABED FEATURES AND SEABED SEDIMENT DISTRIBUTION

TOP CHALK ISOPACH AND BOTNEY CUT CHANNELS

INTERPRETED PROFILES ( LINES NH0778-410 AND NH0778-456 )

LINES NH0778-461 AND NH0778-462ALIGNMENT SHEETS 1 TO 5