PSInSAR在铅山县矿区地表沉降监测中的应用

Application of PSInSAR in Monitoring Land Subsidence in Yanshan Mining Area

永久散射体干涉测量技术(persistent scatterer InSAR, PSInSAR)通过对同一地区的多景影像数据的分析,探测出一定数量的、均匀分布的永久散射体目标(persistent scatterers, PS),以PS点作为分析目标进行建模求解,从而反演出目标区域的地表形变情况.以江西上饶重要金属矿产地铅山县作为研究区域,采用PSInSAR技术对2016-08～2017-03期间采集的18景sentinel-1A影像进行时序分析,获取了该地区的沉降变化情况.分析结果显示,铅山县内永平铜矿及其周边存在较大形变,沉降中心区最大沉降速率达到-90 mm/y,沉降区域与矿区所在的实际空间分布位置较为一致;弋阳县、横峰县和铅山县的交界处也存在一定沉降形变,区域沉降速率达-20 mm/y.实验表明在金属矿区应用PSInSAR技术进行沉降监测具有良好的效果.

Persistent scatterer InSAR （PS InSAR） is capable of detecting a certain number of persistent scatterers （PS） by analyzing the stability of amplitude and phase of images covering the same area. The persistent scatterers are used to model and analyze the deformation of target areas. Taking the Yanshan, an important metal mining area in Shangrao of Jiangxi Province, as an experimental area, this paper took 18 sentinel-lA images from 2016-08 to 2017-03 to analyze land subsidence caused by mining based on PS- InSAR. Experimental results show that there is a heavy subsidence in Yongping Copper Mine. The maximum land subsidence velocity of Yongping Mine is -90 mm/y, and the area subsidence takes the similar distribution with the mining distribution. The area bound by Yiyang County and Hengfeng County has a weaker subsidence, with subsidence velocity of -20 mm/y. The experiment shows that PSInSAR is effective in monitoring metal mining area.