Ground deformation monitoring using small baseline DInSAR technique: A case study in Taiyuan City from 2003 to 2009

Abstract

DInSAR 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 DInSAR technique is used to investigate the ground deformation of Taiyuan City,Shanxi Province,from 2003 to 2009 by using 23 ENVISAT ASAR images.The experiment results demonstrate that;(1)during this period, four significant subsidence centers have been developed in Taiyuan,namely Xiayuan,Wujiabu, Xiaodian,Sunjiazhai.The largest subsidence center is Sunjiazhai with an average subsidence rate of —77.28 mm/a;(2)The subsidence of the old center,Wanbolin,has slowed down.And the subsidence in the northern region has stopped and some areas even rebounded.(3)The change of subsidence centers indicates that the control measures of closing wells and reducing exploitation taken by the Taiyuan government has achieved initial effects.(4)The experiment results have been validated with leveling data and the accuracy is 2.90 mm,which shows that the small baseline DInSAR technique can be used to monitor urban ground deformation.