三峡水库首次蓄水引起的重力变化及其机制的初步研究
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摘要
介绍了三峡工程蓄水前后的精密重力测量和坝区库水荷载、地壳变形、地下水位变化以及降雨等各种因素引起的重力效应.研究表明:①库坝地区:水荷载的重力效应最为显著,最大重力变化约为200×10-8m/s2;地壳变形的重力效应存在,但量级和范围均有限,其影响范围离库岸约5km;地下水位变化的重力效应则只存在于局部地带,不具区域性;降雨对精密重力测量结果的影响不容忽视.②库首地区:最大重力变化区域在香溪附近,蓄水后的重力场变化需要继续监视和深入研究.
In this paper we have analyzed precise gravity survey and gravity effects resulted from water loading, crustal deformation, ground water level change and precipitation before and after the water impoundment in the Three Gorges Reservoir. We found that: ① In dam area of the reservoir: gravity effect resulted from water loading is the most significant, maximum gravity change is 200×10 -8 m/s2, but this effect is limited in terms of amplitude and range. It is about 5 km offshore gravity change can be observed. The gravity change caused by ground water level change is regional; and the impact of rainfall on it should not be neglected. ② At head area of the reservoir: the maximum gravity change is near Xiangxi. Monitoring the variation of gravity field and further study should continue in the future.
引文
车用太,鱼金子,刘五洲,等.2002.三峡井网的布设与观测井建设[J].地震地质,24(3):423~431
    车用太,刘五洲,颜萍,等.2004.三峡井网地下流体动态在水库蓄水前后的变化[J].大地测量与地球动力学,24(2):14~22
    杜瑞林,乔学军,邢灿飞,等.2004a.三峡二期工程蓄水后的垂直形变场[J].大地测量与地球动力学,24(1):41~45
    杜瑞林,邢灿飞,伍中华,等.2004b.长江三峡库区地震地形变监测研究[J].大地测量与地球动力学,24(2):23~29
    孙少安,项爱民,李辉.2002.三峡工程库首区的重力场变化与构造活动[J].大地测量与地球动力学,22(3):56~59
    孙少安,项爱民,刘冬至,等.2004.三峡工程蓄水前后的精密重力测量[J].大地测量与地球动力学,24(2):30~33
    王清云,张秋文,李峰.2003.长江三峡工程库首区诱发地震危险性研究[J].大地测量与地球动力学,23(2):101~106
    邢灿飞,龚凯虹,杜瑞林.2002.长江三峡工程地壳形变监测网络[J].大地测量与地球动力学,23(1):114~118
    杨光亮,申重阳,王晓权,等.2005.三峡水库蓄水重力效应数值模拟[J].大地测量与地球动力学,25(1):19~23
    Wang Hansheng,Hsu Hou Tse,Zhu Yaozhong.2002.Prediction of surface horizontal displacements,and gravity andtilt changes caused by filling the Three Gorges Reservoir[J].Journal of Geodesy,76:105~114

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