佘雅文^1,2,,
付广裕^1,,,
赵倩¹,
郭凌冬¹
1. 中国地震局地震预测研究所(地震预测重点实验室), 北京 100036
2. 南京大学地球科学与工程学院, 南京 210023

基金项目: 国家自然科学基金(41874003)，国家重点研发计划(2018YFC1503704)和中国地震局基本科研业务费(2020IEF0502，2020IEF0508，2020IEF0708)联合资助


详细信息

作者简介: 佘雅文, 男, 博士后, 主要从事重力观测与解释研究.E-mail: sheyawen@outlook.com

通讯作者: 付广裕, 男, 博士, 研究员, 主要从事震源物理与重力均衡研究.E-mail: fugy@ief.ac.cn

中图分类号: P312

收稿日期:2020-05-03
修回日期:2020-12-27
上线日期:2021-06-10

Simulating changes of gravity and Coulomb stress caused by the impoundment of the Baihetan hydropower station

SHE YaWen^1,2,,
FU GuangYu^1,,,
ZHAO Qian¹,
GUO LingDong¹
1. Key Laboratory of Earthquake Prediction, Institute of Earthquake Forecasting, Earthquake Administration, Beijing 100036, China
2. Nanjing University, School of Earth Sciences and Engineering, Nanjing 210023, China


More Information

Corresponding author: FU GuangYu,E-mail:fugy@ief.ac.cn

MSC: P312

--> Received Date: 03 May 2020
Revised Date: 27 December 2020
Available Online: 10 June 2021


摘要
摘要:白鹤滩水电站为中国第二大在建水电站，蓄水过程引起的重力和库仑应力变化对于该地区的水储量变化和触发地震研究具有重要参考价值.首先，本文给出了水电站库区临近区域均衡重力异常场，结果表明该地区基本处于均衡状态，较为稳定.其次，利用白鹤滩水电站库区地形数据，模拟计算了蓄水过程引起的地表和GRACE-FO (Gravity Recovery and Climate Experiment Follow-on)卫星观测的重力变化，并与GRACE-FO实际观测数据进行了对比分析.模拟计算的重力变化表明，蓄水引起的重力变化为毫伽量级，万有引力作用为库区重力变化的主因，该重力变化比弹性形变的结果大两个量级.模拟GRACE-FO重力变化表明，白鹤滩地区蓄水引起的卫星观测重力变化为微伽量级，GRACE-FO有可能观测到白鹤滩水电站蓄水的重力变化.最后，计算了蓄水引起的地壳内部应力变化，并给出了小江断裂带北段断层的库仑应力变化，该结果表明库仑应力变化在巧家以南和以北的两个区域大于0.01 MPa，该地区触发地震的可能性需密切关注.
关键词: 白鹤滩水电站/
均衡异常/
重力变化/
GRACE-FO/
库仑应力

Abstract:The Baihetan hydropower station is the second largest hydropower station under construction in China. The changes of gravity and Coulomb stress caused by the impoundment process are very important for the study of water storage change and potential earthquake triggering in this area. This paper calculates the isostatic gravity anomaly field in the vicinity of the hydropower station reservoir area. The results show that the area is basically in an isostatic state and relatively stable. Then the elevation data of the Baihetan reservoir area is used to simulate the gravity changes caused by the impoundment process and Gravity Recovery and Climate Experiment Follow-on(GRACE-FO) satellite observations. Furthermore, the results are compared with GRACE-FO actual observation data. The simulation results show that the gravity changes caused by the impoundment are of a milligal magnitude, and the universal gravitation is the main cause of gravity changes in the impoundment process, which is two orders of magnitude greater than the elastic deformation result. The simulated GRACE-FO gravity changes show that the satellite observation gravity changes caused by the impoundment are of a microgal magnitude, and the GRACE-FO may observe the gravity changes of the impoundment of Baihetan hydropower station. Finally, the load theory is used to calculate the internal stress changes in the crust caused by the impoundment. The Coulomb stress changes of in the northern section of the Xiaojiang fault zone are calculated simultaneously. The result indicates that the Coulomb stress changes are greater than 0.01 MPa in the two areas south and north of Qiaojia. The possibility of triggering an earthquake in this area needs to be closely monitored.
Key words:Baihetan hydropower station/
Isostatic anomaly/
Gravity change/
Gravity Recovery and Climate Experiment Follow-on(GRACE-FO)/
Coulomb stress



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