时序InSAR技术在三峡库首区潜在滑坡识别中的应用研究

Identification of Potential Landslides in the Head Area of the Three Gorges Reservoir Based on Time Series InSAR

三峡库区内断裂带发育,诱发多种地质灾害,其中主要为滑坡灾害,因此对滑坡灾害进行识别尤为重要。在已有三峡库区地质灾害调查的基础上,利用时序InSAR技术对三峡库首区的地表形变进行监测,通过影像裁剪、影像配准、地形相位估计、差分干涉、高相干点选取、相位解缠、形变提取和误差估计等数据处理手段,获取三峡库首区时间序列PS点,利用PS点的形变速率值来圈定潜在滑坡区;通过形变曲线及影像分析,证明时序InSAR技术用于三峡库首区滑坡识别可行且效果较好,能为三峡库区地质灾害风险防控提供科学依据。

The continuous development of faults in the Three Gorges Reservoir area induces a variety of geological disasters,especially the landslide disasters.Thus,the identification of landslide disasters is particularly emergently.In this study,time-series InSAR technology is used to monitor the surface deformation of the head region of the Three Gorges Reservoir.Based on data-processing techniques including image cropping,image registration,terrain phase estimation,differential interference,high-coherence point selection,phase unwrapping,deformation extraction,and error estimation,PS points in the time series of the head region of the Three Gorges Reservoir are obtained.The deformation rate values of the PS points are used to delineate the potential landslide area.The deformation curve and image analysis verify that the time series InSAR technology utilized for the identification of landslides in the head region of the Three Gorges Reservoir area is feasible and effective.The results will provide the scientific basis for the prevention and control of geological hazards in the Three Gorges Reservoir area.