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 signifi- cant, maximum gravity change is 200 ×10^-8 m/s^2 , 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.
出处
《地震学报》
CSCD
北大核心
2006年第5期485-492,共8页
Acta Seismologica Sinica
基金
技部社会公益研究专项(2004DIB3J131)资金资助.
关键词
三峡工程
首次蓄水
重力变化
The Three Gorges Project
The first water impoundment
Gravity change
