基于DS-InSAR的西部矿区地表时序沉降监测与分析

Time Series Monitoring and Analysis of Surface Subsidence in Western Mining Areas Based on DS-InSAR

针对常规时序合成孔径雷达干涉测量(Interferometric Synthetic Aperture Radar,InSAR)技术在西部矿区受高原堆积型沙丘地貌的影响难以获取足够数量的监测点,无法完整提取矿区地表形变信息的问题,以西部矿区内蒙古石拉乌素煤矿为例,基于覆盖研究区域的52景Sentinel-1A数据,利用一种针对西部矿区高原堆积型沙丘地貌的基于分布式目标InSAR(Distributed Target InSAR,DS-InSAR)的时序地表形变监测方法,获取了2016—2018年研究区域采动引起的地表形变时空分布信息。研究结果表明:在监测时段内矿区地表出现了2处明显的下沉盆地,盆地内垂直方向最大累计沉降超过400 mm;与常规时序InSAR方法相比,该方法可在研究区域内获取更多数量空间分布均匀的监测点,从而更加准确地提取研究区域的面状地表形变信息。与水准实测数据对比结果显示,二者相关系数为0.97,二者间绝对误差较小且误差整体分布合理,表明该方法具有较高的可靠性,能够很好地应用于西部矿区高原堆积型沙丘地貌特征下非充分采动时的地表形变监测。

Affected by the landform of plateau accumulation dune in western mining area,conventional time-series interferometric synthetic aperture radar(InSAR)technology is difficult to obtain a sufficient number of monitoring points,and cannot completely extract the surface deformation information of the mining area.Taking Shilawusu Coal Mine in Inner Mongolia in western mining area as an example,based on 52 Sentinal-1A image data covering the study area,a time-series surface deformation monitoring method based on distributed target InSAR(DS-InSAR)for plateau accumulation dune landform in western mining area is used in this paper,the temporal and spatial distribution information of surface deformation caused by mining in the study area from 2016 to 2018 is obtained by this method.The study results show that during the monitoring period,there are two obvious subsidence basins on the surface of the mining area,and the vertical maximum cumulative subsidence in the basin exceeds 400 mm.Compared with the conventional time series InSAR method,this method can obtain more monitoring points with uniform spatial distribution in the study area,so as to extract the surface deformation information of the study area more accurately.Compared with the level measured data,the correlation coefficient between them is 0.97,the absolute error between them is small and the overall error distribution is reasonable,indicating that this method has high reliability and can be well applied to the surface deformation monitoring during inadequate mining under the landform of plateau accumulation dune in western mining area.