Research Papers

Monitoring deformation evolution in Longtan Reservoir area by multitemporal interferometric synthetic aperture radar using time sequences of spaceborne synthetic aperture radar images

[+] Author Affiliations
Xiaogang Song

Institute of Geology, China Earthquake Administration, State Key Laboratory of Earthquake Dynamics, Qijiahuozi Huayanli Jia 1, Chaoyang district, Beijing 100029, China

Xinjian Shan

Institute of Geology, China Earthquake Administration, State Key Laboratory of Earthquake Dynamics, Qijiahuozi Huayanli Jia 1, Chaoyang district, Beijing 100029, China

Aiguo Zhao

GeoWatch Technology Inc., 4968 Yonge Street, Toronto, Ontario M2N 7G9, Canada

J. Appl. Remote Sens. 7(1), 073585 (Feb 14, 2013). doi:10.1117/1.JRS.7.073585
History: Received September 12, 2012; Revised January 22, 2013; Accepted January 23, 2013
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Abstract.  In order to discover the relationship between the earth surface deformation evolution and the water impoundment/discharge and penetration process in the Longtan Reservoir area, we process a time series of images from Envisat ASAR and ALOS PALSAR instruments using an MT-InSAR technique enhanced by corner reflectors. This allows us to successfully obtain a deformation map from this densely vegetated reservoir area with karst topography. We obtain time series of precise deformation images, which show clearly, for the first time, the complete spatio-temporal earth surface deformation evolution in the whole reservoir area during the impoundment/discharge process. The results from the two kinds of data show a similar underlying pattern: (1) The water load causes subsidence in almost all of its immediate surroundings; (2) the subsidence magnitude shows cyclic variation matching seasonal water level variation. Every year, the water level starts to increase in June and quickly reaches its peak in July to August, and the subsidence immediately follows and also reaches its peak magnitude in July to August; then the water level decreases slowly, and the area rebounds slowly. (3) Statistical analysis of time-series deformation shows that about 60% of the deformation occurs during the rain season (June to August) can be restored, and the remaining 40% become permanent.

© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Xiaogang Song ; Xinjian Shan and Aiguo Zhao
"Monitoring deformation evolution in Longtan Reservoir area by multitemporal interferometric synthetic aperture radar using time sequences of spaceborne synthetic aperture radar images", J. Appl. Remote Sens. 7(1), 073585 (Feb 14, 2013). ; http://dx.doi.org/10.1117/1.JRS.7.073585


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