Norfolk Marine Provides Scour Remediation for Scroby Sands

Norfolk Marine has completed installation of its TFN scour remediation system to E.ON’s Scroby Sands offshore wind farm.

The system has been installed to 5 monopile foundations on the site to provide protection against further scouring of the seabed at the foundation bases.

After testing and development including scale modelling at HR Wallingford’s new Fast Flow Facility the TFN system was installed in late 2015.

According to Norfolk Marine, the TFN System captures and maintains natural seabed sediments so reinstating the seabed with naturally occurring materials, this not only prevents further scouring around base of subsea structures but offers protecting to cables at the critical interface between trench and J tube. For new build sites the system can be installed after monopile and cable installation has been completed.

“Our analysis of the short term impacts showed that the nets were effective in preventing and reducing scour around monopile foundations,” HR Wallingford said.

E.ON operations & maintenance manager, Steve Johnson, commented: “The TFN System developed by Norfolk Marine Ltd gives a cost effective alternative to rock dumping or sand/stone filled geotextile bags. The TFNs can be easily removed for cable maintenance, and can be reinstalled, without the need for expensive dredging.”

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