论海岸带高精度重力测量中区—远一区地形改正计算

The Study on the Median Region-Far Region Ⅰ Terrain Correction of High Precision Gravity Survey in the Coastal Zone

摘要: 在重力地形改正理论公式的基础上，建立修正海水引力影响的海岸带重力地形改正公式，经计算，常见海岸带斜面地形下坡度角从1°增大至10°，修正后公式和规范公式的改值之差的极大值从0.074×10⁻⁵ m/s²增大至7.387×10⁻⁵ m/s²，直接影响重力测量异常精度；并以地形相对复杂的东海南部海岸带及渤海海峡北隍城岛海域为例进行正演计算和分析，结果表明采用建立的地形改正公式进行改正可有效提高海岸带重力测量异常精度。

Abstract: On the basis of the theoretical formula for gravity terrain correction, a coastal gravity terrain correction formula for correcting the influence of seawater gravity is established. After calculation, the slope angle of common coastal slope terrain increases from 1 ° to 10 °, and the maximum difference between the modified formula and the standard formula is 0.074×10⁻⁵ m/s² to 7.387×10⁻⁵ m/s², which directly affects the accuracy of gravity measurement anomalies. Taking the coastal zone of the East China Sea and the Beihuangcheng Island area in the Bohai Strait with relatively complex terrain as examples for forward calculation and analysis, the results show that using the established terrain correction formula for correction can effectively improve the accuracy of gravity measurement anomalies in the coastal zone.