Ground Deformation Monitoring in Tongzhou Based on High Resolution SAR Images
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RESEARCH ARTICLE
Ground Deformation Monitoring in Tongzhou Based on High Resolution SAR Images Changjun Huang 1,2 & Jiming Guo 1 & Xiaodong Yu 1 & Zhiping Nie 2
Received: 17 August 2015 / Accepted: 11 November 2015 # Indian Society of Remote Sensing 2016
Abstract D-InSAR technique based on time series of SAR images has been very popular to monitor ground slow deformation in recent years, such as Permanent Scatterers (PS) method, small baseline subsets (SBAS) method, and coherent targets (CT) method. By taking advantage of PS method and CT method, in this paper, small baseline and Permanent Scatterers D-InSAR technique are used to investigate the ground deformation of Tongzhou district in Beijing City, from January 4, 2009 to August 14, 2011 by using 21 COSMO-SkyMed single complex images. The experiment results demonstrate that the two methods of SBAS and PS technique have high consistency in the trends of ground deformation and the time series of deformation value according to choosing some latitude and longitude of the same points, and the deformation rate respectively reaches -7 cm/year and 4 cm/year; during this period, four significant subsidence centers have been developed in Tongzhou district, namely SanJianfang town, Jinzhan town, Songzhuang town and Tongzhou city center. The largest subsidence center is SanJianfang town with an average subsidence rate of −4.7 cm/year, the center of deformation area of SanJianfang town and Tongzhou district are more and more obvious expansion and polymerization. The subsidence of the old center, Wangsiying, has slowed down, and the subsidence in the western region has stopped and some areas even rebounded, and the possible cause for the ground deformation is groundwater extraction.
* Changjun Huang [email protected] 1
School of Municipal and Surveying Engineering, Hunan City University, Yiyang, Hunan 413000, China
2
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
Keywords SBAS . PS . Ground deformation . Time series analysis . High resolution SAR images
Introduction With the rapid economic growth, urban public infrastructure, rail road transportation, high-rise buildings are in the ascendant, to flourish. Accelerating urbanization process has brought rapid development, but also have brought enormous risks for the city. According to the current geological survey results, since the 1970s, the groundwater level has been rapidly declining in Beijing. It declines in three directions, east, south and north, forming five small settlement area, Including Changping, Chaoyang, Shunyi, Tongzhou and Daxing (Liu and He 2008). In the 17 years from 1935 to 1952, the local maximum cumulative subsidence in Beijing is only 58 mm, while within the year of 2009 the largest settlement reached 137.51 mm. By the end of 2009, the settlement areas (the cumulative settlement is greater than 100 mm) are up to 1225.41 km2. The stratum of Tongzhou, located in the east of Beijing, composed mainly of clay and sand, and a larger proportion of sand. During the 10 years from 199
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