DInSAR与SBAS InSAR矿区地面沉降监测能力对比分析与验证

Comparative analysis and verification of DIn SAR and SBAS In SAR in mining subsidence monitoring

DInSAR与SBAS InSAR是目前常用于矿区地面沉降监测的两种InSAR技术.以山东济南某矿区地面沉降为研究对象,利用DInSAR、SBAS InSAR对覆盖该矿区的28景Sentinel-1A SAR影像进行处理,获取2018年07月至2019年06月期间的矿区地面沉降信息,利用矿区工作面开采信息与同时期水准监测数据,定性和定量地对比、分析和验证了这两种InSAR技术的矿区地面沉降监测精度和能力.研究发现,在沉降边缘区域,DInSAR和SBAS InSAR的监测结果与水准监测结果之间的差异较小,能较好反映矿区沉降的实际情况,而在沉降中心区域,二者的监测结果与水准监测结果有较大差异,监测能力不足.相比较而言,DInSAR技术在矿区沉降中心的快速大形变监测中更可靠,SBAS InSAR技术在矿区周边缓慢微小形变监测中精度更高.DInSAR和SBAS InSAR监测到的沉降值与水准监测结果之间的绝对差值曲线呈现出沉降漏斗边缘小、中心大的特征,这一发现可为后续研究DInSAR和SBAS InSAR监测结果的校正方法提供重要参考.

DInSAR and SBAS InSAR are two InSAR techniques commonly used for ground subsidence monitoring in mining areas.Taking the ground subsidence of a mining area in Jinan,Shandong province as the research object.Using DInSAR and SBAS InSAR to process 28 Sentinel-1 A SAR images covering the mining area,the ground subsidence information of the mining area was obtained from July 2018 to June 2019.Based on the mining information of the mining faces and the monitoring data of leveling during the same period,the monitoring accuracy and ability of the two InSAR techniques are compared,analyzed and verified qualitatively and quantitatively.It was found that there was a little difference between DInSAR,SBAS InSAR and leveling monitoring results at the edge of subsidence basins,which could better reflect the actual situation of mining subsidence,while there was an obvious difference between DInSAR,SBAS InSAR and leveling monitoring results in the center of subsidence basins,and the monitoring ability was insufficient.In comparison,DInSAR technology is more reliable in monitoring fast and large deformation in the subsidence center of the mining area,and SBAS InSAR technology is more accurate in monitoring slow and small deformation around the mining area.The curves of the absolute difference between the DInSAR,SBAS InSAR and the leveling monitoring deformation values showed the features that the absolute difference was little at the edge of the subsidence basins and was great in the center of the subsidence basins,which can provide an important reference for the subsequent study on the correction method of the deformation values monitored by DInSAR and SBAS InSAR.