| 利用CORS站网监测三峡地区环境负荷引起的地壳形变与重力场时空变化 |
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| 引用本文： | 章传银,王伟,甘卫军,李辉,张庆涛.利用CORS站网监测三峡地区环境负荷引起的地壳形变与重力场时空变化[J].武汉大学学报(信息科学版),2018,43(9):1287-1294. |
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| 作者姓名： | 章传银 王伟 甘卫军 李辉 张庆涛 |
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| 作者单位： | 1.中国测绘科学研究院, 北京, 100830 |
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| 基金项目： | 国家重点研发计划2016YFB0501702国家自然科学基金41374081国家自然科学基金41304009 |
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| 摘 要： | 受地球动力学因素特别是地球表层大气、地表水及地下水动力环境影响，地面站点位置、地球重力场及大地水准面随时间变化。以三峡地区CORS站网为主，少量重力台站为辅，采用负荷形变与地球重力场严密组合方法，综合确定了2011-01-2015-06三峡地区环境负荷驱动的地壳形变与重力场月变化，结果显示:（1）CORS站网具备地壳垂直形变、大地水准面及地面重力变化的监测能力；（2）三峡地区地壳垂直形变年变化幅度36.1 mm，大地水准面年变化幅度28.2 mm，地面重力年变化幅度117.4 μGal；（3）CORS站网地面重力变化监测精度水平不低于流动重力场重复测量；（4）CORS站网地壳垂直形变与地面重力变化监测具有一定的外推预报能力。
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| 关 键 词： | GNSS CORS站 环境负荷形变 区域重力场变化 三峡 地壳形变 |
| 收稿时间： | 2017-09-07 |
Monitoring Temporal and Spatial Changes of Crustal Deformation and Gravity Field Caused by Environmental Load in the Three Gorges Reservoir Region Based on CORS Network |
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| Institution: | 1.Chinese Academy of Surveying & Mapping, Beijing 100830, China2.Institute of Geology, China Earthquake Administration, Beijing 100029, China3.Institute of Earthquake, China Earthquake Administration, Wuhan 430071, China4.The First Geodetic Brigade, National Administration of Surveying, Mapping and Geoinformation, Xi'an 710054, China |
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| Abstract: | Due to the geodynamic factors, especially the earth's surface atmosphere, surface water and groundwater hydrodynamic environment, ground site location, earth gravity field and geoid level change over time. Based on the Three Gorges CORS stations network and a small number of gravity stations, the crustal deformation and monthly gravity change of the Three Gorges area from January 2011 to June 2015 are calculated and analyzed in this paper by combination of load deformation and gravity field. The results show that:(1) CORS network has the ability to monitor the vertical deformation of the crust, ground gravity and geoid change. (2) The annual variation of the crustal vertical deformation in the Three Gorges area is 36.1 mm, the annual variation range of the geoid is 28.2 mm, and the annual variation of ground gravity is 117.4 μGal. (3) The accuracy of ground gravity change monitoring level of CORS network is not lower than the accuracy of flow gravity field. (4) Vertical deformation and ground gravity change monitoring has a certain ability of extrapolation forecasting. |
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