摘要
利用重复重力数据采用遗传算法反演地下异常体密度变化,通过模拟试算验证了该方法的有效性和稳定性,并反演了三峡水库第一次蓄水前后地下岩体密度变化。考虑到蓄水引起地下岩体密度变化的几种可能情况,应用4种先验密度差来拟合该地区2003年4—7月重复重力数据扣除水荷载引起的重力变化后的剩余重力变化,取得了一些有意义的结果。
The method for inversing density changes of underground abnormal body with genetic algorithm by use of the repeated gravity data is described. The validity and stability of this method are proved by simulating trial calculation. The density changes before and after the first water impounding of Three Gorges Reservoir are inversed. Considering some possible situations of underground rock body＇ s density changes caused by the water impounding, four priori density contrasts are used to fit the remaining gravity changes obtained by repeat gravity data from April to July 2003 after deducting the gravity changes caused by the water loading. Some meaningful results are given.
出处
《大地测量与地球动力学》
CSCD
北大核心
2008年第1期36-40,共5页
Journal of Geodesy and Geodynamics
基金
国家公益研究专项(2004DIB3J131)
中国地震局地震研究所所长基金(IS200726009)
国家支撑计划子题(2006BAC01B02-02-05)
国家自然科学基金(40574012)
关键词
重力数据
遗传算法
密度变化
反演
蓄水
gravity data
genetic algorithm （GA）
density change
inversion
water impounding
