联合大地水准面、海面地形和潮波运动数值模拟的长江口陆海垂直基准转换关系  

Establishment of Sea-Land Vertical Datum Transformation for Hydrography Combining with Geoid,Sea Surface Topography and Numerical Simulation of Tidal Wave Motion in the Yangtze Estuarine Waters

作　　者：柯灝 赵建虎[2] 周丰年 吴敬文 暴景阳 赵祥伟 谢朋朋 KE Hao;ZHAO Jianhu;ZHOU Fengnian;WU Jingwen;BAO Jingyang;ZHAO Xiangwei;XIE Pengpeng(Chinese Antarctic Center of Surveying and Mapping,Wuhan University,Wuhan 430079,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;Hydrology and Water Resources Survey Bureau of Yangtze River Estuary,Bureau of Hydrology,Changjiang Water Resources Commission,Shanghai 200136,China;Jiangsu Power Design Institute Co.,Ltd of China Energy Engineering Group,Nanjing 211102,China)

机构地区：[1]武汉大学中国南极测绘研究中心,湖北武汉430079 [2]武汉大学测绘学院,湖北武汉430079 [3]长江水利委员会水文局长江口水文水资源勘测局,上海200136 [4]中国能源建设集团江苏省电力设计院有限公司,江苏南京211102

出　　处：《武汉大学学报（信息科学版）》2022年第5期731-737,746,共8页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41506120);江苏海域海洋无缝垂直基准建模及海陆垂直基准转换关系技术研究(32-JK-2022-029)。

摘　　要：长江口水域地形地貌研究对河道治理建设、水上交通运输等人类社会经济活动具有重要意义,而建立高精度的无缝深度基准面及其与其他垂直基准间转换模型将直接影响到水陆交界区高精度地形地貌数据的获取及统一综合管理与分析。为此着重研究了基于三维潮波运动数值模拟、海面地形和大地水准面3种手段联合的河口水域无缝深度基准面构建及其与其他垂直基准间转换模型,并在长江口南支这一典型河口水域进行了建模实验和模型精度评估分析。结果显示,垂直基准转换模型中误差为12.4 cm,与现场长期潮位站实际观测结果比对分析得垂直基准转换模型误差绝对值均值为24.2 cm,尽管大于模型中误差估值,但仍满足国际水道测量规范对测深中垂向最大不确定度的要求。Objective:The research on topography and landform of the Yangtze estuarine waters is of great significance to human social and economic activities such as river management,river construction and water transportation.Establishing an accurate and seamless chart datum and its transformation model with other vertical datums will directly affect the acquisition of high-precision topographic and geomorphic data at the water-land junctions and the unified comprehensive management and analysis.Thus,this paper studies the establishment of seamless chart datum and its transformation model with other vertical datums for estuarine waters,combining with geoid,sea surface topography and three-dimensional numerical simulation of tidal wave motion.Methods:Firstly,the unstructured-grid,finite-volume community ocean model(FVCOM)was used to simulate tidal level and calculate the tidal range at each grid node with the underwater topographic data and the open boundary water level forcing data.According to the correlation between tidal range and chart datum,the chart datum value of each grid node was deduced using tidal range ratios from tide gauge stations with known datums,and a regional seamless chart datum was then established.Secondly,the mean sea surface topography corresponding to a long time scale at each grid node was calculated with the daily sea surface topography product provided by the Copernicus marine environment monitoring service(CMEMS).The mean sea surface topography model was further established by the minimum curvature interpolation.Meanwhile,the geoid in the corresponding area was calculated by the global ultra-highorder gravity field model Earth gravitational model 2008(EGM2008)with a spatial resolution of 5’×5’.Thirdly,the geoid model was established through bi-quadratic interpolation.Finally,according to these three constructed models and the geometric relationship of three kinds of vertical datums in space,unification to a consistent spatial resolution was performed and the separation value between chart

关 键 词：深度基准 大地水准面 海面地形 潮波运动 垂直基准转换 长江口 

分 类 号：P229[天文地球—大地测量学与测量工程]