大地测量与地球动力学2024，Vol.44Issue(8)：873-880,8.DOI:10.14075/j.jgg.2023.11.103
基于重力异常数据构建海陆交界区域海底地形模型
Seafloor Topography Model Construction in the Boundary Area of Sea-Land Based on Gravity Anomaly Data
摘要
Abstract
Aiming at the shortcomings of the seafloor topography inversion based on gravity data in ir-regular shape sea area(e.g.the sea-land boundary area),such as the implementation difficulty,we propose the improved gravity-geologic method(iGGM)and regression analysis method(iGA)based on the approximate linear relationship between seafloor topography data and gravity data,combined with depth soundings and gravity anomaly data,to predict seafloor topography in the area.We select the range of 2°× 2°(6°N～8°N,115°E～117°E)in the south China sea as the study area.Using iGGM and iRA,and compared with the SCS_Grid model(gridded acoustic bathymetric data in the study are-a)and topo_23.1 model,etc.,we construct the SCS_iGGM and SCS_iRA seafloor topography mod-els.The experimental results show that the overall statistical results of the SCS_iGGM and SCS_iRA are similar to the SCS-DTU18 model,SCS-ETOPO1 model and SCS_topo_23.1 model in the sea-land boundary sea area,and the correlation coefficient is higher than 0.99.The external checking results in the study area shows that the accuracy of the SCS_iGGM and SCS_iRA is comparable.Compared with the SCS-DTU18 model,SCS-ETOPO1 model and SCS_topo_23.1 model,the accuracy of the SCS_iG-GM and SCS_iRA models are improved by about 76％,70％and 53％respectively.Combining the sea gravity anomaly and ship depth soundings to establish seafloor topography model,either in terms of the seafloor topography data recovery capacity,or the quality of model construction,is better than the seafloor topography model that relies only on ship depth soundings data.关键词
卫星测高重力异常/海底地形/重力地质法/回归分析技术/非规则形状海域Key words
satellite altimetry gravity anomaly/seafloor topography/gravity-geologic method/regres-sion analysis technology/irregular shape sea area分类
天文与地球科学引用本文复制引用
杜斌,范雕,胡兴猛,谭勖立,万宏发,裴宪勇..基于重力异常数据构建海陆交界区域海底地形模型[J].大地测量与地球动力学,2024,44(8):873-880,8.基金项目
国家自然科学基金(42204009,42174007,42174008,42074017). National Natural Science Foundation of China,No.42204009,42174007,42174008,42074017. （42204009,42174007,42174008,42074017）
