Application of time series InSAR technology in monitoring ground deformation of mining area：A case study at Huolinhe open pit mining area in Inner Mongolia
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摘要:
针对露天矿区与城区地表相干性不一的特征，提出一种改进的时序InSAR(合成孔径雷达干涉测量)技术对霍林河矿区及周围城区地表进行形变监测。首先，通过增加时间采样密度控制相干性来筛选矿区周边具备一定相干点密度的干涉数据；其次，采用经过参数优化的分布式散射点选取方法选取分布式目标并使用传统方法提取永久散射体；最后，将分布式目标与永久散射体目标混合构建Delaunay三角网进行两次回归分析得到研究区域地表形变速率。实验结果显示，霍林河矿区边坡最大形变速率达到−630 mm/a，矿区周边道路地面最大沉降速率达到71 mm/a，霍林郭勒市地表沉降速率最大达到15 mm/a，与同期GPS监测结果进行对比，证明改进的时序InSAR技术方法适用性良好，对矿业城市地表形变监测提出了一种新的InSAR监测方法。
Abstract:In view of the inconsistency of surface coherence between the open-pit mining area and its urban area, an improved time-series InSAR(synthetic Aperture radar interferometry) technique is proposed to monitor the surface deformation of Huolinhe mining area and its surrounding urban area in this paper. First of all, through increasing the density of time sampling to control the coherence, so as to screen interference data with certain coherent point density around the mining area;Secondly,a distributed scatterer selection method with optimized parameters is used to select distributed targets and the permanent scatterers are extracted by traditional methods; Finally, the Delaunay triangulation network was constructed by mixing the distributed target and the permanent scatterer target, and the surface deformation rate in the study area was obtained by two regression analyses. The experimental results shows that the largest mine slope deformation rate of Huolinhe reached -630 mm/a, the maximum subsidence rate of surrounding roads of mining area ground reached 71 mm/a, the surface subsidence rate in Holingol city reached 15 mm/a, compared with GPS monitoring results of the same period, the applicability of this method is proved to be good.
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Key words:
- timing sequence InSAR /
- deformation in mining area /
- surface deformation /
- Sentinel 1
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表 1 研究区SAR数据参数表
Table 1. SAR data parameter table in the research area
参数 Sentinel 1 幅宽/km 250 雷达波长/cm 5.6 空间分辨率/（m×m） 5×20 重访周期/d 12 影像数量/景
轨道号29149（降轨） 时间覆盖范围 2019-01-04—2019-12-30 
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表 2 研究区累积沉降量表
Table 2. Cumulative settlement scale
1—3月 4—6月 7—9月 10—12月 平均沉降量/mm 5.3 14.7 16.2 12.5 最大沉降量/mm 31.3 46.5 264.7 36.7
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表 3 GPS监测结果与同期InSAR监测结果比较
Table 3. Comparison of GPS monitoring results with InSAR monitoring results in the same period
点号 InSAR形变速率/（mm·a-1） GPS形变速率/（mm·a-1） 互差/（mm·a-1） A −12.46 −10.72 −1.74 B −31.27 −35.34 4.07 C −9.57 −5.39 −4.18 D −6.18 −8.42 2.24 E −16.73 −15.97 −0.76 F −26.49 −20.85 −5.64
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