摘要
[目的]为了确保海上风机运行安全,需要掌握海上风机基础周边地形的变化。[方法]文章采用了多波束测深系统对风机周边地形进行了6次定期监测,获取了高精度和高密度的水下地形点云数据,通过对点云数据进行数据处理和分析,构建了高精度的水下地形数字高程模型DEM,通过数字高程模型叠加分析,计算出不同时期的冲刷量,最后通过三维模型展示不同时期地形的变化,分析引起冲刷的原因。[结果]导致风机周边地形变化最直接的原因是强台风影响通过风电场海域时,海床和风机局部区域通常会发生较大的整体性变化;潮流和波浪的联合作用,这是该海域海床地形局部冲刷和淤积的另一个重要原因。[结论]利用多波束测深系统对水下地形进行监测的方法是有效的,可以为海上风电的安全运营和维护提供重要数据支撑。文中提到的工程实践对开展同类工程水下地形监测具有较好的借鉴意义。
[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.
作者
刘新华
LIU Xinhua(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,Guangdong,China)
出处
《南方能源建设》
2022年第1期64-70,共7页
Southern Energy Construction
基金
广东省促进经济高质量发展专项资金项目“海上风电项目建设期和运营期环境影响研究”(GDOE〔2019〕A09)。
关键词
监测
水下地形
多波束测深系统
数字高程模型
冲刷量
monitoring
underwater topography
multi-beam sounding system
digital elevation model
erosion quantity
