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2001-2006, Osiris Projects, Rhyl Flats Offshore Wind Farm, Seabed Comparison

2001-2006, Osiris Projects, Rhyl Flats Offshore Wind Farm, Seabed Comparison

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Geophysical

Description

This project examines hydrographic surveys carried out by Osiris project in 2005 and 2006.  The overall primary objective of the surveys was to map bathymetry, sub-bottom profiling and seabed features, including any magnetic anomalies and sonar contacts.  The data from the 2005 and 2006 surveys was compared to evaluate general movement across the site.  The scope was extended when bathymetric data from the 2001 survey, carried out by Fugro Ltd, was also made available for comparison.  The data comparison has indicated seabed level variations over parts of the development area.  When comparing the 2006 data to the 2001 data, the data showed marked lateral, west to east shift in the contours on the large southerly area of the sand waves.  This shift has resulted in highly localised seabed level changes, particularly along the crests and troughs of the large sand waves, which is caused by gradual movement of these large bed forms from west to east across the area.

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