Acta Geodaetica et Cartographica Sinica >

2017 , Vol. 46 >Issue 6: 671 - 678

DOI: https://doi.org/10.11947/j.AGCS.2017.20160331

Monitoring Vertical Crustal Deformation and Gravity Variations during Water Level Changes at the Three Gorges Reservoir

  • WANG Wei ,
  • DANG Yamin ,
  • ZHANG Chuanyin ,
  • BAI Guixia ,
  • BAO Lifeng ,
  • GAN Weijun
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  • 1. Chinese Academy of Surveying & Mapping, Beijing 100830, China;
    2. National Administration of Surveying, Mapping and Geoinformation, Beijing 100830, China;
    3. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;
    4. Institute of Geology, China Earthquake Administration, Beijing 100029, China

Received date: 2016-06-30

  Revised date: 2017-05-07

  Online published: 2017-06-28

Supported by

The National Natural Science Foundation of China (Nos. 41474011;41374081;41304009);The National High-tech Research and Development Program of China (863 Program) (No. 2015AA124001)

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Abstract

Monitoring vertical crustal deformation and gravity changes during water level changes at the Three Gorges reservoir is important for the safe operation of the Three Gorges Dam and for the monitoring and prevention of a regional geological disaster. In this study, we determined vertical crustal deformation and gravity changes during water level variations of the Three Gorges reservoir from direct calculations and actual measurements and a comprehensive solution. We used water areas extracted image data from the ZY-3 satellite and water level data to calculate gravity changes and vertical crustal deformation caused by every 5 m change in the water level due to storage and drainage of the Three Gorges reservoir from 145 m to 175 m. The vertical crustal deformation was up to 30 mm. The location of gravity change above 20 μ Gal(1 Gal=10-2 m/s2) was less than 2 km from the centerline of the Yangtze River. The CORS ES13 in Badong, near the reservoir, measured the vertical crustal deformation during water level changes. Because of the small number of CORS and gravity stations in the Three Gorges reservoir area, monitoring deformation and gravity related to changes in the Three Gorges reservoir water level cannot be closely followed. Using 26 CORS and some of the gravity stations in the Three Gorges area and based on loading deformation and the spherical harmonic analysis method, an integrated solution of vertical deformation and gravity variations during water level changes of the reservoir was determined, which is consistent with the actual CORS monitoring results. By comparison, we found that an integrated solution based on a CORS network can effectively enhance the capability of monitoring vertical crustal deformation and gravity changes during water level variations of the reservoir.

Key words： water level change; Three Gorges reservoir; monitoring; vertical deformation; gravity variation

Cite this article

WANG Wei , DANG Yamin , ZHANG Chuanyin , BAI Guixia , BAO Lifeng , GAN Weijun . Monitoring Vertical Crustal Deformation and Gravity Variations during Water Level Changes at the Three Gorges Reservoir[J]. Acta Geodaetica et Cartographica Sinica, 2017 , 46(6) : 671 -678 . DOI: 10.11947/j.AGCS.2017.20160331

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