2021 Volume 77 Issue 2 Pages I_361-I_366
As for the monopile foundation for offshore wind turbine, stone-based scour protection is commonly used in Europe. A filter layer of crushed stone to prevent suction of sand ground is covered by an armor layer using large stones to prevent scattering of the filter layer. In Japan, it is difficult to obtain good quality stones especially for the armor layer, so we propose a scour protection using Filter Units (FU), the rock bags, for the armor layer.
In this study, hydraulic model tests using a sandy movable bed were conducted to confirm the stability of the scour protection in high waves and to investigate the effect of varying the planar extent of FU installation area. The scour protection did not settle and scour around FU was not significant when the area of FU was reduced to three times the diameter of the monopile under the conditions studied.
