Application Of SBAS-InSAR Technology In Land Subsidence Monitoring In Urumqi City

With the development of social economy,land subsidence has become a safety hazard that cannot be ignored in our daily life.Land subsidence is not conducive to urban construction,and it is easy to cause the foundation of the building to be weak,causing the house to collapse.In severe cases,it will damage the urban facilities,causing the engineering facilities to sink,crack,deform,etc.,and the ground subsidence will cause the road to be uneven or cracked.Hidden dangers,threatening economic property and life safety.At present,the monitoring methods for land subsidence in Urumqi are still based on traditional contact measurement,such as precision leveling,tilting photogrammetry and GPS measurement.Although the measurement accuracy of these ground deformation monitoring methods can reach millimeter or even sub-millimeter,there are inherent limitations in measurement range,measurement efficiency,measurement time and economic benefits,and it is difficult to meet regional and large-scale land subsidence.Monitor demand.This paper is completed under the background of ?Application of Microwave Remote Sensing Surface Subsidence Monitoring Technology——Taking Urumqi City as an Example?.The project is based on the archive data of Cosmo-SkyMed in the main city of Urumqi from May 2015 to December 2016,using SBAS-InSAR technology to conduct land subsidence monitoring research in the main urban area of Urumqi.On the basis of project monitoring,this paper mainly does the following work: 1)Briefly summarize and compare the common InSAR technology principles;2)Use SARscape software to obtain the time series of the study area,and obtain the average settlement rate map and cumulative settlement of the study area.The map shows the spatial distribution of land subsidence in eight districts and counties within the scope of analysis.Taking the Shuimogou area as an example,the field verification points are selected to analyze the temporal and spatial variation characteristics,and the relevant literature references are used to analyze the driving factors affecting the land subsidence in Urumqi.3)Deformation analysis of key monitoring areas,extraction of sedimentation rate maps of railways and mining areas in the study area,analysis of settlement trends and timing characteristics.4)Based on the ground subsidence information and social economic data,the land subsidence risk evaluation system is constructed,and the risk assessment of land subsidence is carried out in the study area,and the spatial classification of risk levels is carried out.This paper provides a theoretical reference for the prevention and disaster assessment of land subsidence in Urumqi.