南黄海辐射沙洲海底地形可视化与定量分析1王百顺1范代读2.DOCVIP

南黄海辐射沙洲海底地形可视化与定量分析 王百顺1，范代读2，顾君晖1，许建雄1，陈新玺1 ( 1. 国家海洋局东海信息中心200137；2. 同济大学 海洋地质国家重点实验室，长江水环境教育部重点实验室，上海 200092) 摘要：南黄海辐射沙洲海底地形复杂多变，精细的数字地形模型、不同地形单元的立体可视模型及其定量统计值是进行海洋科学研究、海洋功能区与海域开发、利用的基础。利用近期在辐射沙洲北翼开展的系统的单波束测深获取的水深资料，根据残差分析，选择研究区现有水深数据最佳插值法－克里金法，生成海底地形的数字高程模型。运用水深分层设色法立体可视地表征了辐射沙洲的四种地形单元：浅滩、沙脊、潮流槽和等。地形剖面曲率分层设色可以更细致地刻画脊、槽相间地形单元的微地貌，如沙脊上的次级槽和潮流槽中的次级脊等，定量地统计不同地形单元的面积及所占比例。根据地形倾角可以定量地分析脊、槽等地形单元的坡形变化，整个沙洲以水平－微倾斜地形（倾角5°）为主，占60％，分布在、沙脊顶部和潮流槽中部等。地形平面曲率和切线曲率可以指示不同地形单元的海洋动力特征，如水流水深较大、流场较弱。 关键词：辐射沙洲；海底地形；残差分析；可视化；定量分析 Visualization and Statistical Analysis on the Submarine Topography of the Radial Tidal Sandy Ridge System in the South Yellow Sea Wang Baishun1，Fan Daidu2Gu Junhui1，Xu Jianxiong1，Chen Xinxi1Eastern Sea Information Centre，SOA，Shanghai 200137，China） Abstract：The Radial Tidal Sandy Ridge System (RTSRS) in the south Yellow Sea has very complex submarine topography. It is fundmental and vital for the scientific research, coastal planning and exploitation to have subtle digital terrain model, 3-dimention visual model and statistics of the different topographic units. The bathymetric survey data were recently collected in the north RTSRS using single-beam echo sounding technique. Kriging interpolation method is considered as the best choice to generate the digital terrain model for the current bathymetric data according to the residual analysis on the measured and interpolated value. The RTSRS can be visually subdivided into four topographic sub-units, including shoal, ridge, channel and broad valley through using the water-depth color bar. The microtopography of ridges and channels can be visually displayed by the profile curvature, like the sub-scale channels on the ridges and the sub-scale ridges in the channels, and quantitatively calculated in area and their percentage of the totall. Quantitatvie analyses on the slope of the ridges and channels shows the RTSRS is dominated by the horizontal-to-weakly-inclined topography with slope angle less than 5°, which accoun