基于Sentinel1A数据的InSAR湘澧盐矿地表沉降监测与分析
2021-10-22唐争气,李艳,郭跃鑫
唐争气,李艳,郭跃鑫



摘 要 為了有效预防地面沉降带来的地质灾害,基于ENVI Sarscape平台,通过对2020年湘澧盐矿地区4-6月份的Sentinel-1A数据进行干涉测量处理,通过形变结果分析盐矿地区各区域的沉降情况,结合土地利用类型、水文、地质和交通等数据,总结各处沉降地区的特征和形成原因,并通过对各矿井沉降速率的获取与分析,验证了InSAR技术在矿区沉降监测应用上的可行性,为该研究区后期的监测工作奠定了实践基础。
关键词 地表沉降;干涉测量;矿区; InSAR
中图分类号: P258 文献标识码:A
Surface Subsidence Monitoring and Analysis of the Xiang Li Salt Mine by InSAR Based on Sentinel-1A Data
Tang Zhengqi1, Li Yan2, Guo Yuexin1
(1.Hunan City University School of Municipal Engineering and Surveying & Mapping, Yiyang Hunan 413000; 2. Xiangtan University, College of Civil Engineering and Mechanics, Xiangtan Hunan 411100)
Abstract: In order to effectively prevent the ground subsidence of geological disaster, the Sentinel-1 data of Xiangli salt mine area from April to June in 2020 was processed by interference measurement based on the ENVI Sarscape platform. The settlement of regional salt mine area was analyzed through the deformation results. Combining with land use types, hydrological, geological and transportation data, the characteristics and forming reason of subsidence area throughout were summarized. By means of the acquisition and analysis of mine subsidence rate, the application feasibility of InSAR technology on mining subsidence monitoring was verified. It provides a practical foundation for the monitoring work in the later period of this research area.
Keywords: surface subsidence; interferometry; mining area; InSAR
盐矿的开采可以推动社会经济的发展,改善人们的生活条件,但是也存在着安全隐患。我国现有盐矿开采区大部分采用钻井水溶法开采,通过钻井注入溶剂,溶解矿层,生成富含开采矿物的卤水,再将其从钻井中抽出。该种方法开采深度大、范围广,容易发生地表沉降,导致矿区周围建筑物变形、甚至被破坏[1]。为了保证基本设施的安全,定时对盐矿进行地表形变监测具有重要的意义[2]。
合成孔径雷达干涉测量(Interferometric synthetic aperture radar,InSAR)是一种新型主动式地表形变监测技术,具有全天时、全天候、覆盖面积广、精度高等特点,被广泛应用于地表形变监测领域,具有极大的发展潜力。1997年,国内学者王超等人开始将InSAR技术应用到地表形变领域[3],之后,在InSAR技术基础上,利用合成孔径雷达差分干涉测量(Differential InSAR,D-InSAR)、时序InSAR(Multi-Temporal InSAR, MT-InSAR)等技术成为了新的研究热点,在矿区地表形变应用上获得了丰硕的成果。
哨兵1号(Sentinel-1)是欧空局发射的雷达遥感卫星,由Sentinel-1A和Sentinel-1B两颗卫星组成,携带C波段合成孔径雷达,与太阳同步轨道,轨道高度693km,轨道倾角为98.18°,重访周期为12天[4]。……
