摘要
为进一步提高传统重力地质法(gravity-geologic method,GGM)反演海底地形的精度,顾及海底地形非线性项对GGM进行改进。采用改进的GGM反演了中国南海地区空间分辨率为1’×1’海底地形模型,并利用船测水深检核点对反演结果进行了精度评定,验证了所提方法的有效性。研究结果表明,忽略海底地形非线性项会在起伏约2 km的山区引起约50 mGal偏差;改进的GGM能有效地从短波重力异常中恢复海底地形的非线性项;获取的海底地形结果与ETOPO1、SIOV23.1及传统GGM反演模型相比具有最高的精度,与检核点差异的均方根为130.4 m;与传统GGM法反演结果相比,改进GGM获得的结果在黄岩海山链附近精度提高10.8 m,在中沙群岛附近精度提高4.7 m。
Objectives:The accuracy of the traditional gravity-geologic method(GGM) for inversion of seafloor topography should be improved.Methods:This paper proposes an improved GGM(iGGM) considering the nonlinear term.The 1 arc minute seafloor topography of the South China Sea is inverted by iGGM,and its accuracy is evaluated through check points to verify the effectiveness.Results:The results show that neglecting nonlinear term of seafloor topography results in a deviation of approximately 50 mGal in mountainous areas with undulation of approximately 2 km.The nonlinear term of seafloor topography could be recovered by the iGGM from short-wavelength gravity anomaly.Conclusions:Compared with the traditional GGM,ETPO1 and SIO V23.1,iGGM has the best accuracy.The root mean square of deviations between iGGM and check points is 130.4 m.Compared with traditional GGM,the improvement of iGGM is 10.8 m near the Huangyan seamount chain,and it is 4.7 m near the Zhongsha Islands.
作者
许闯
黎晋博
吴云龙
XU Chuang;LI Jinbo;WU Yunlong(School of Civil and Transportation,Guangdong University of Technology,Guangzhou 510006,China;State Key Laboratory of Geodesy and Geodynamics,Institute of Precision Surveying Science and Technology Innovation,Chinese Academy of Sciences,Wuhan 430077,China;School of Geography and Information Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《武汉大学学报（信息科学版）》
EI
CAS
CSCD
北大核心
2023年第6期891-901,共11页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金(41974014,41974096,41931074)
中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室开放基金(SKLGED2021-1-2)
广东省自然科学基金(2022A1515010396)。
关键词
海底地形
重力异常
重力地质法
非线性项
seafloor topography
gravity anomaly
gravity-geologic method
nonlinear term
