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利用IERS协议上的方法和DE405星历文件,基于三峡地区CORS站和重力台站位置,计算了从2011年到2015年6月固体潮每2 h对三峡地区地壳垂直形变和重力变化的影响,并计算了2012年12月14日大潮期间固体潮影响分布。研究发现,三峡地区固体潮有很强的周期性,存在半月和半年的长周期、一天和半天的短周期。三峡地区农历每月月中和月底前后有2次大潮,月中和月底的大潮潮差相差约1/4;每年冬季(月球赤纬28°36’,约11、12、1月)和夏季(约5、6、7月,太阳高度角接近最大)大潮潮差大,春季和秋季大潮潮差小。大地高最大潮高0.346 m,最低潮高-0.190 m(参考历元2000.0);固体潮对重力与对垂直形变影响异相,最大值110μGal,最小值-200μGal。区域固体潮呈明显的条带分布,固体潮对垂直形变与重力变化影响的增减方向相反。本文的研究成果可用于CORS站、重力台站的固体潮影响分析,为局部固体潮相关研究提供参考。
Based on the method of IERS protocol and DE405 ephemeris document, based on the locations of CORS station and gravity station in the Three Gorges area, the influence of the solid tide every 2 h from 2011 to June 2015 on the crustal vertical deformation and gravity change in the Three Gorges area was calculated. The influence of tide on solid tide on December 14, 2012 was calculated. The study found that the tidal flat in the Three Gorges area has a strong periodicity, with long periods of half moon and half year, short period of one day and half day. There are two tides in the middle of the month and the end of the lunar month in the Three Gorges area. The tide tides differ by about 1/4 between the middle of the month and the end of the lunar month. Each year the winter (moon declination 28 ° 36 ’, about 11, 12, January) and summer (About 5, 6, July, the solar elevation angle is close to maximum) Large tidal wave difference, spring tide and autumn tidal tidal difference is small. The maximum tide height of the earth is 0.346 m and the lowest tide is -0.190 m (reference epoch 2000.0). The effect of solid tide on gravity and vertical deformation is out of phase with a maximum of 110 μGal and a minimum of -200 μGal. The regional tide of solid was obviously banding distribution, and the tide of solid tide had the opposite direction of the increase and decrease of vertical deformation and gravity change. The research results of this paper can be used to analyze the influence of solid tides on CORS stations and gravity stations and provide reference for the research on local solid tides.