武汉大地站地下水位变化对重力固体潮调和分析精确度的影响  

Groundwater Influence on the Harmonic Analysis of Tidal Gravity Data at Wuhan Geodetic Station

作　　者：贺前钱 陈晓东[2] HE Qian-qian;CHEN Xiao-dong(School of Geomatics,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Geodesy and Geodynamics,Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,China)

机构地区：[1]东华理工大学测绘工程学院,江西南昌330013 [2]中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,湖北武汉430077

出　　处：《东华理工大学学报（自然科学版）》2020年第6期534-539,共6页Journal of East China University of Technology(Natural Science)

基　　金：江西省教育厅科技计划项目(GJJ170447);国家自然科学基金(41574072);东华理工大学科研基金(DHBK2017151)。

摘　　要：目前大多数重力固体潮调和分析研究只考虑了气压变化的影响,而关于地下水位变化的影响少有涉及。为此,以武汉大地测量国家野外科学观测研究站(简称武汉大地站)的超导重力仪潮汐观测数据为例,采用Eterna软件从标准差、振幅因子和残差频谱三个方面分析了地下水位变化对该站重力固体潮调和分析结果的影响。结果表明,不加高通滤波时,地下水位变化对调和分析的总标准差、周日及更短周期频段的标准差稍有影响,对周期大于周日的长周期频段结果影响明显。加高通滤波时,无需考虑地下水位变化对调和分析的标准差、振幅因子及残差振幅谱的影响。这可为重力潮汐数据中地下水位的重力影响研究及更精确获取重力固体潮汐参数提供重要参考。With the tidal observation of superconducting gravimeter from Wuhan Geodetic National Field Observation and Research Station(Wuhan Geodetic Station)as an example,the influence of groundwater on the harmonic analysis of tidal gravity is analyzed from three aspects:standard deviation,amplitude factor and residual spectrum.The numerical results show that the seasonal amplitude of the groundwater is about two orders larger than that of other tidal bands.Therefore,it can be determined that the energy of groundwater change is mainly concentrated in the seasonal band,but there still is a small amount of energy in diurnal and shorter-periodic bands.In the absence of high-pass filtering,considering the impact of changes in groundwater levels can reduce the total standard deviation of the harmonic analysis and increase the standard deviation in diurnal,semidiurnal,terdiurnal,and quaterdiurnal bands slightly.Groundwater has a significant impact on the long-periodic waves.In the case of high-pass filtering,there is almost no change in the standard deviation and amplitude factors of the harmonic analysis after considering groundwater changes.And the difference in residual amplitude spectrum is within±0.001 nm/s 2.This implies that there is no need to consider the groundwater effects on tidal harmonic analysis in diurnal and shorter-periodic bands.This study provides a scientific basis for the research of groundwater effects on tidal gravity data.

关 键 词：地下水位重力影响 重力固体潮 超导重力仪 调和分析 频谱分析 

分 类 号：P641[天文地球—地质矿产勘探] P312[天文地球—地质学]