改进的重力地质法及其在中国南海地区海底地形反演中的应用

许闯; 黎晋博; 吴云龙

doi:10.13203/j.whugis20220199

改进的重力地质法及其在中国南海地区海底地形反演中的应用

Improved Gravity-Geologic Method and Its Application to Seafloor Topography Inversion in the South China Sea

摘要

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。

Abstract:
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) consi-dering 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.

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