Time Series InSAR Monitoring and Influencing Factors of Land Subsidence Along the Beijing-Tianjin Section of Beijing-Shanghai Expressway,China
Land subsidence,as one of the main geological hazards in the plain area,has a potential impact on the safe operation of the expressway.In order to explore the land subsidence of the Beijing-Tianjin section of Beijing-Shanghai expressway,70 Sentinel-1 B satellite images from January 2017 to March 2020 were selected,and SBAS-InSAR technology was used to monitor the land subsidence along the section.The accuracy of InSAR monitoring result was evaluated by external level observation.On this basis,nine factors were divided into three categories to conduct spatial simulation of the settlement amount.By comparing the simulation effects of OLS,GWR and MGWR models,the relative optimal model was selected to conduct quantitative research on various influencing factors.The results show that the Beijing-Tianjin section of Beijing-Shanghai expressway exhibits uneven settlement characteristics,with a maximum annual sedimentation rate exceeding-90 mm·a-1.There are mainly six obvious severe settlement centers distributed in the study area,with three of them passing through by Beijing-Shanghai expressway.The quantitative analysis of MGWR model,which has the best simulation effect,shows that the deposition thickness of Quaternary system and groundwater level changes have greater influence on the settlement,while the topographical environmental factors have less influence.
land subsidenceSBAS-InSAR technologytime series analysisGWR modelimpact factorBeijing-Shanghai expressway
万方数据
维普
