ICESat-2卫星测高与光学遥感融合测深在海上风电工程前期中的应用研究

Application of ICESat-2 Satellite Altimetry and Optical Remote Sensing Fusion Bathymetry in the Early Stage of Offshore Wind Power Project

海上风力发电作为可再生能源,发展迅速,其重要性逐渐上升。在海上风电前期工程中,近岸水深或海底地形对海上风力发电场选址等非常重要。水深测量技术,如单波束、多波束、机载激光雷达需耗费大量人力、财力等。ICESat-2作为新一代激光测高卫星,其在沿轨水深和海底地形测量中可发挥作用,进一步将ICESat-2沿轨水深与光学遥感影像融合以获取区域性水深成果。通过对特拉弗斯城65 km²水域实验结果表明,四轨ICESat-2沿轨水深精度平均RMSE为0.23 m,平均R²达0.93,多波段模型和对数比值模型融合测深RMSE约0.87 m和0.63 m。并将该技术在青岛近岸水域开展实验,探究在国内近岸水域测深的可能性。

As a renewable energy source,offshore wind power is developing rapidly and its importance is gradually increasing.In the preliminary engineering of offshore wind power,the nearshore water depth or seabed topography is very important for the location of offshore wind power plants.Bathymetric measurement techniques,such as single beam,multi-beam and airborne liDAR,require a lot of manpower and financial resources.As a new generation of laser altimetry satellite,ICESsat-2 can play a role in the measurement of water depth along the orbit and seabed topography.The ICESat-2 is further integrated with optical remote sensing images to obtain regional water depth results.The experimental results of 65 km²waters in Traverse City show that the average RMSE of the depth accuracy of the fourrail ICESat-2 along the track is 0.23 m,and the average R² is 0.93.The RMSE of the combined sounding of the multiband model and the log-ratio model is about 0.87 m and 0.63 m,respectively.The technology was tested in Qingdao coastal waters and the possibility of sounding in domestic coastal waters was explored.