Special Issue (Coastal Engineering)Paper
EXPERIMENTAL STUDY ON SCOUR PREVENTION PERFORMANCE OF ANNULAR FILTER UNIT PLACED AROUND MONOPILE FOUNDATION
2023 Volume 79 Issue 17 Article ID: 23-17173
Details
2023 Volume 79 Issue 17 Article ID: 23-17173
One of the methods proposed for preventing scour around the monopile foundation of an offshore wind turbine is to cover the seafloor surface with many round filter units. However, it has been pointed out that there is a possibility that these filter units may move, or the sand can be sucked out from the gaps around the monopile.
In this study, we proposed an annular filter unit that can efficiently prevent these phenomena. A series of model tests were conducted to verify its basic fabrication and construction feasibility, as well as its performance in preventing scouring.
The results demonstrated that the fabrication and construction would be feasible by appropriately selecting the formwork, using shape-retaining ropes, and installing appropriate amount of stone. It was confirmed that the hydraulic performance could be improved by covering the area of about three times the monopile diameter with the annular filter unit, and that the effectiveness in preventing scour could be enhanced by using round filter units or asphalt mats in combination.
