Land subsidence monitoring and influencing factor analysis in Changzhou based on time series interferometry methods
Land subsidence is one of the main geological disasters in Changzhou City,Jiangsu Province.In order to grasp the dynamics of land subsidence and ensure the sustainable development of this region,we used the Multi-Temporal InSAR technique to monitor the surface deformation in central areas of Changzhou,and analyzed its influencing factors in this study.Firstly,one hundred and eighty-six Sentinel-1 A SAR images acquired from January 2016 to December 2022 were used to form interferograms by means of long and short baseline combination in this paper.Secondly,the interferograms were checked based on the loop phase closure and the atmospheric delay was removed from the interferograms by using Generic Atmospheric Correction Online Service(GACOS).After atmospheric delay correction,we derived the time series of land subsidence from the corrected unwrapped phases.The results were consistent with the leveling data acquired in the same period,and root mean square error did not exceed 2.5 mm/a.Then,geological conditions and groundwater leveling data were combined to analyze the influencing factors.The results show that the central areas of Changzhou are relatively stable as a whole,and the problem of land subsidence is only in a particular area in the west of Zouqu Town and the south of Wujin District.Whereas,the ground deformation and land uplift happens in central urban area.
deformation monitoringMulti-Temporal InSARgeneric atmospheric correction online service for InSARloop phase closure
万方数据
维普
