基于SBAS-InSAR技术的平川矿区形变监测与分析

Surface Deformation Monitoring and Analysis of Pingchuan Mining Area Based on SBAS-InSAR Technology

以平川矿区为例,采用SBAS-InSAR技术对该区域升降轨哨兵数据进行解算,并获取了该区域准三维地表形变场,结合夜光遥感数据对地表形变监测结果的可靠性进行验证,通过标准差椭圆方法分析区域形变时空演化特征。结果表明:(1)研究区准三维地表形变场垂直向最大年沉降平均速率为-16.75 cm×a-1,均以地面沉降为主;(2)平川矿区形变中心空间上主要分布在平川区中部及西北部地区;(3)矿区夜光值增加区与加速形变区具有“追随”特点;(4)区内共识别出12处明显形变区,均具有沉降漏斗特性;(5)2020年1月至2020年8月地表累积形变在西北-东南方向形变加剧,2020年8月至2021年4月地表累积形变在不同方向变化较缓慢,累积地表形变空间演化表现为主轴逆时针旋转。

Taking Pingchuan mining area in Baiyin City as an example,we used SBAS-InSAR technology to solve the sentinel-1 data of the lift track in this area for two years,and obtained the quasi 3D surface deformation field in this area.Combined with nighttime light remote sensing data,we verified the reliability of surface deformation monitoring results,and used standard deviation ellipse method to analyze the spatio-tempo-ral evolution characteristics of regional deformation.The results show that①the average rate of maximum vertical annual settlement of quasi 3D surface deformation field in the study area is-16.75 cm·a-1,which is dominated by land subsidence.②The deformation centers of Pingchuan mining area are mainly distributed in the middle and northwest of Pingchuan District.③The increasing area of nighttime light value and the ac-celerating deformation area in the mining area have the characteristics of“following”.④A total of 12 obvious deformation areas are identified in the area,all of which have the characteristics of settlement funnel.⑤From January 2020 to August 2020,the cumulative surface deformation intensifies in the northwest southeast direction.From August 2020 to April 2021,the cumulative surface deformation changes slowly in different directions.The spatial evolution of cumulative surface deformation shows that the main axis rotates counterclockwise.