2024 Volume 80 Issue 17 Article ID: 24-17128
The anti-scour performance and stability of an annular filter unit designed to effectively prevent scouring around monopile foundations against waves were investigated through 1/60th scaled irregular wave hydraulic model experiments. The experiments were conducted in comparison with conventional round filter units. Five types of scour protection were tested under different wave conditions: no protection, round, annular 3D (where the bag diameter is three times the pile diameter D), annular 2D plus asphalt mat, and annular 2D plus round outer circumference. The results of the seafloor surface image measurements showed that even under the wave conditions that caused scouring when the round filter units were used, the scouring when the annular filter unit was used was significantly reduced. The annular filter unit did not move under the wave conditions where the round filter unit was observed to move, confirming the superiority of the annular filter unit.
