SBAS-InSAR技术在奎达市及以东地区地面沉降监测与分析中的应用

Application of SBAS-InSAR in Land Subsidence Monitoring and Analysis in Quetta City and the Eastern Region

采用2018年1月至2019年12月的28景Sentinel-1A降轨影像数据,利用短基线集(SBAS-InSAR)技术反演了巴基斯坦奎达市及以东地区的形变时间序列,对其中3个沉降量较大的区域选择了6个特征点进行了形变时间序列分析,总结了研究区在监测时段内的地表形变规律。结合研究区自然地理和社会经济概况、区域地质背景和矿产资源赋存等相关资料,通过与前人的研究成果进行对比分析,对研究区地面沉降发生的原因进行了初步探讨,研究结果表明:随着城市化进程加快,地下水的过量开采是导致奎达市城区地面沉降的主要原因,而奎达市以东地区地面沉降多与煤矿、铬铁矿等矿产资源开采活动密切相关。奎达市及以东地区地面沉降范围广、沉降速率大,应采取加强城区地面沉降监测和防治手段,规范矿产资源开发秩序,引进先进的采矿设备和技术等措施来防止或减缓地面沉降的发展。

By using the image data of 28 Sentinel-1 A de-orbit scenes from January 2018 to December 2019,the short baseline set(SBAS-InSAR)technology was utilized to retrieve the deformation time series of east area in Pakistan.There were 6 characteristic points selected for deformation time series analysis in 3 areas with large subsidence,and the law of surface deformation in the study area during the monitoring period was summarized.On this basis,combined with relevant data such as the physical geography and socio-economic profile,regional geological background and mineral resource of the study area,through comparative analysis with the previous research results,the reasons for the occurrence of land subsidence in the study area were preliminary discussed.The research results show that with the acceleration of urbanization,and the excessive exploitation of groundwater is the main reason for the land subsidence in the urban area of Quetta city.The land subsidence in the east of Quetta is closely related to the mining activities such as coal mines and chromite.Quetta city and its east area have a wide range of land subsidence,large subsidence rate.Measures should be taken to prevent or slow down the occurrence of land subsidence such as strengthen monitoring and prevention of land subsidence in urban areas,standardize the order of mineral resource development,and introduce advanced mining equipment and technologies.