Application of SBAS-InSAR and PS-InSAR technologies in analysis of landslide subsidence along a linear infrastructure in Southwestern Shandong
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摘要:
地面沉降问题严重影响着鲁西南经济发展区交通工程建设。文中选择某线性工程两侧5 km范围作为研究区,文章收集RadarSAT-2(2017—2020年)、Sentinel-1A(2019—2020年)存档数据和沿线区域地质、水文地质、矿产开发资料,采用时序InSAR分析的方法,对研究区沿线地面沉降分布特征及规律进行综合分析。研究结果表明:研究区主要地面沉降诱因是煤矿采空区塌陷和地下水超量开采,前者以矿区工作面为中心形成沉降漏斗,沉降速率变化和沉降中心移动与煤矿作业工作面挖掘进度和转移密切相关;后者沉降分布规律与地下水开采使用点相关,形成与地下水开采使用范围相近的沉降带。研究区在2017—2020年内持续发生沉降,最大年均沉降速率为136.5 mm/a,单年累计最大沉降量为220 mm。经同期CPI水准点观测结果校核,InSAR数据处理成果平均误差小于1 cm/a,相关系数到达70%以上。本文采用的分析方法能及时准确反映出线路方案穿行研究区内各处地面沉降变化,为线路方案规划和地质灾害整治提供有效合理参考。
Abstract:Land subsidence is a serious problem that affects the construction of traffic engineering in the economic development zone in southwestern Shandong Province. This paper selects the range of 5 km on both sides of a linear project as the research area. The article collects RadarSAT-2(2017-2020), Sentinel-1A(2019-2020) archived data , geological data, hydrogeological data, and mineral development data, and uses time-series InSAR measurement to analyze the distribution characteristics and laws of land subsidence in the study area. The research indicates: the main causes of ground subsidence in the study area are coal mine goaf collapse and excessive groundwater mining; the former forms a settlement funnel with the mining area as the center, the change of settlement rate and the movement of the settlement center are closely related to the mining progress and transfer of the coal mining area; The latter’s settlement distribution law is related to the distribution of groundwater use areas, forming a subsidence zone that similar to the range of groundwater mining. The study area continued to experience subsidence during 2017 to 2020, with the maximum annual subsidence rate at 136.5 mm/a, and the cumulative maximum subsidence in a single year at 220 mm. After checking the observation results of CPI benchmarking points during the same period, the average error of InSAR data processing results is less than 1cm/a, and the correlation coefficient is more than 70%. The analysis method adopted in this paper can timely and accurately reflect the changes in land subsidence throughout the study area, provide effective and reasonable reference for route planning and geological disaster remediation.
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表 1 研究区星载SAR数据源基本参数
Table 1. Basic parameters of satellite SAR data sources in the study area
参数 SAR传感器 RadarSAT-2 Sentinel-1A 幅宽/km 125 250 雷达波长/cm 5.6 5.6 空间分辨率/m2 5×5 5×20 重访周期/d 24 12 影像数量 26 32 时间覆盖范围 2017-01-14—2020-07-27 2019-02-03—2020-07-15 表 2 菏泽地区第四系含水岩组水文地质特征[22]
Table 2. Hydrogeological characteristics of the Quaternary water-bearing rock group in Heze[22]
岩组划分 浅层潜水孔隙水 中-深层承压孔隙水 深层承压孔隙水 埋深/m 20~80 200~300 300~450 岩性 粉砂、粉细砂为主,多层分布,被黏土和淤泥质土隔开,砂层分布不均,累计厚度为10~30 m 粉砂、粉细砂为主,因上部有黏土隔水层,该层水具有承压性。砂层连续性差,分布有4~6层,累计厚度为8~20 m 粉细砂、细砂为主,砂层连续性差,
累计厚度为20~50 m水文地质特征 接受大气降水、地表水及农业灌溉回渗补给、富水性较强,单井涌水量为500~3000 m3/d,该层地下水位菏泽市农业灌溉主要用水 接受上层潜水的越流补给及侧向径流补给,富水性相对较弱,单井涌水量为500 m3/d,该层地下水主要为矿化度大
于2 g/L的咸水,基本没有开发利用补给单一,接受侧向径流补给,水流滞缓,
补给量较小。单井涌水量小于500~
1000 m3/d,为菏泽地区城区工业及
生活主要用水表 3 CPI测量值与InSAR数据采样值精度评估
Table 3. Accuracy evaluation of CPI measurement value and InSAR data sampling value
2018年12月较2016年6月 2020年6月较2016年6月 中误差 23.45 mm/a 23.682 mm/a 平均误差 7.23 mm/a 6.98 mm/a 相关系数 0.72 0.75 -
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