大地水准面起伏对重力归算的影响研究

摘要

针对目前重力探测中重力改正时常用的两个高程参考系统存在偏差这一事实,选取两个大地水准面起伏变化较大的剖面区域,分析大地水准面起伏对重力归算的影响.结果表明,剖面跨度和剖面大地水准面起伏梯度都会对布格重力异常产生影响,所以当重力探测区域大地水准面起伏差距较大时,大地水准面与参考椭球面之间的差异对重力归算的影响比较突出,在利用布格重力异常反演、解释地壳密度结构时,大地水准面起伏的影响必须考虑.%At present,there are two vertical reference systems that are commonly used in gravity correction.Based on this fact,we choose two profiles with large geoid variation and discuss the effect of geoid undulation on gravity reduction.The results show that the profile's span and geoid gradient will influence on the Bouguer gravity anomaly,so when the gravity detection area's geoid undulation has large changes,the influence of the difference between the geoid and the reference ellipsoid on the gravity reduction is more prominent.When we calculate Bouguer gravity anomaly to inversion and interpretation,the effects of geoid undulation must be considered.