| Summary: | [Introduction] In order to ensure the safety of operation of offshore wind turbine, it is necessary to grasp the change of topography around the offshore wind turbine foundation. [Method] The multi-beam sounding system was used to monitor the terrain around the wind turbine for 6 times, and the high-precision and high-density underwater terrain point cloud data were obtained. Through the data processing and analysis of the point cloud data, the high-precision underwater terrain digital elevation model (DEM) was constructed. Through the superposition analysis of the DEM, the quantity of erosion in different periods was calculated. Finally, the change of terrain in different periods was displayed by 3D model, and the causes of erosion were analyzed. [Result] The most direct reason for the terrain change around the wind turbine is that when a strong typhoon passes through the sea area of the wind farm, the seabed and the local area of the wind turbine usually undergo a large overall change; The combined action of tidal current and waves is another important cause of local erosion and siltation of the seabed topography in this area. [Conclusion] The multi-beam sounding system is effective in monitoring the underwater topography, which can provide important data support for the safe operation and maintenance of offshore wind power. The practice of the project has a good reference significance for carrying out underwater topography monitoring of similar projects.
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