| In recent years,China’s economic development has gradually accelerated,the level of urbanization has become higher and higher,and the scale of underground resource exploitation has also increased.At the same time of rapid development,a series of related issues such as land surface deformation and land resource damage must also be paid attention to.Songyuan City is located in the central and western part of Jilin Province,where the terrain and geomorphic conditions are complex and diverse,water resources and mineral resources are rich,and the economic output value ranks the third in Jilin Province,with an important social status.However,frequent earthquakes and excessive exploitation of groundwater and oil and gas resources have made Songyuan City a susceptible area for land surface deformation.Surface deformation will cause damage to public facilities such as roads,power,and water conservancy,slow down the pace of urban construction,and have a certain impact on the irrigation function of rivers and lakes and the sustainable development of ecological and economic construction in Songyuan City.Therefore,it is of great practical significance to carry out the monitoring of surface deformation in Songyuan City for the prevention and control of geological disasters,the rational exploitation of mineral resources and the stable development of economy.Although the traditional surface deformation monitoring technology(such as leveling,GPS,etc.)can meet the requirements of millimeter level in the accuracy of monitoring results,it is difficult to meet the needs of large-scale surface deformation monitoring at the present stage due to its large amount of manpower and material resources,high operation cost,slow data update and small monitoring range.Based on the introduction of the basic principles and development process of InSAR and the advantages of time-series InSAR,this paper conducts time-series land surface deformation monitoring and analysis of deformation inducement in Songyuan City.The main research contents are as follows:(1)Land surface deformation monitoring based on time series InSAR in Songyuan City.Taking Sentinel-1 images of different tracks covering Songyuan City from August 2015 to August 2019 as data sources,based on SBAS-InSAR,the time-series surface deformation result and average deformation rate in the whole city were obtained,and the temporal-spatial evolution features of deformation were analyzed in depth.For the key deformation area in urban area,the Sentinel-1 images were processed again based on PS-InSAR to compare and analyze the differences of processing results of different time-series InSAR methods using same SAR images,and discuss the applicability of different time-series InSAR methods;(2)Cross-validation of deformation results based on different SAR images.Taking the PALSAR-2 images of ALOS-2 satellite as the data source,the deformation result of some area in Songyuan City was obtained based on SBAS-InSAR.By comparing this result with the deformation result based on Sentinel-1 images,cross-validation between the deformation results of multi-source SAR images was achieved;(3)Analysis of the natural influence factors of surface deformation.By overlaying land cover product,the deformation results of different land cover types were compared.Combine the temperature and precipitation data and the occurrence of earthquakes during the monitoring period to study the internal relationship between time-series deformation and climate data,and analyze the influence of earthquakes distribution on deformation.By monitoring the land surface deformation of Songyuan City and analyzing its laws,we can provide data reference for wetland environmental protection,ecological and geological environment improvement,earthquake monitoring and prediction of Songyuan City,improve the scientific level of surface deformation disaster monitoring and prevention,and lay a good foundation for the ecological construction and sustainable economic development. |
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