To maintain the seabed around the monopile foundations at a fixed level, a scour protection system consisting of rock is applied in the design. Scour protection systems are traditionally applied in two consecutive stages, and this includes installing:
- a filter layer around the base of the monopiles consisting of finer material; and
- an armour layer on top of the filter material
The monopiles may be installed prior to both layers, or in between the two; in either case, the total installation comprises three steps. However, significant cost reduction could be achieved if just one layer of graded scour protection needed to be installed—as proven possible in this innovative solution.