三峡库水位变化过程中的地壳垂直形变与重力变化监测

发布时间：2018-03-12 06:23

本文选题：水位变化　切入点：三峡水库　出处：《测绘学报》2017年06期 　论文类型：期刊论文

【摘要】：监测三峡库水位变化过程中的地壳垂直形变和重力变化,对三峡水库的安全运行和区域地质灾害监测防治等具有重要意义。本文从直接计算、实际测量和综合解算3个方面研究了三峡库水位变化过程中地壳垂直形变和重力变化。基于资源三号卫星影像提取的水体数据,结合水位数据,直接计算了三峡水库蓄放水从145~175m每隔5m的影响,地壳垂直形变最大可达30mm,对重力影响超过20μGal(1Gal=10~(-2) m/s~2)的范围距离长江中心线约2km内。库区较近的巴东CORS站(ES13)能够实际测量到库水位变化过程中的地壳垂直形变。由于目前三峡库区的CORS站和重力台站数量较少,分布不均,还不能满足紧密跟踪三峡库水位变化过程中的监测需求。利用三峡地区26座CORS站和部分重力台站数据,基于负荷形变理论和球谐分析方法,综合解算了库水位变化过程中的地壳垂直形变和重力变化,与实际CORS监测结果一致。通过对比分析发现,基于CORS站网的综合解算,能够有效提升对库水位变化过程中的地壳垂直形变和重力变化的监测能力。
[Abstract]:The monitoring of vertical crustal deformation and gravity change in the process of water level change in the three Gorges reservoir is of great significance for the safe operation of the reservoir and the monitoring and prevention of regional geological hazards. The vertical crustal deformation and gravity change in the process of water level change in the three Gorges reservoir are studied from three aspects of actual measurement and comprehensive calculation. Based on the water body data extracted from the satellite image of Resource-3, the water level data are combined with the water level data. The effect of water storage and discharge from 145m to 175m in the three Gorges Reservoir is calculated directly. The maximum vertical deformation of the crust can be up to 30 mm, and the influence on gravity is more than 20 渭 Gal1, Gal1, 10 ~ 2) m / s ~ (2)) within 2 km from the center of the Yangtze River. The near Padang CORS Station ES13) can actually measure the crustal vertical deformation during the process of water level change in the reservoir. The number of CORS stations and gravity stations in the former three Gorges Reservoir area is relatively small. The uneven distribution can not meet the monitoring demand in the process of closely tracking the variation of the water level of the three Gorges reservoir. Based on the data of 26 CORS stations and some gravity stations in the three Gorges area, the theory of load deformation and the spherical harmonic analysis method are used. The vertical crustal deformation and gravity variation in the process of reservoir water level change are calculated synthetically, which are consistent with the actual CORS monitoring results. It is found by comparison and analysis that based on the comprehensive solution of CORS network, It can effectively improve the monitoring ability of crustal vertical deformation and gravity change in the process of reservoir water level change.
【作者单位】：中国测绘科学研究院;国家测绘地理信息局;中国科学院测量与地球物理研究所;中国地震局地质研究所;
【基金】：国家自然科学基金(41474011;41374081;41304009) 国家863计划(2015AA124001)~~
【分类号】：P22;TV697.21

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