基于InSAR技术的黄土滑坡及周边斜坡变形识别

Deformation identification of loess landslides and surrounding slopes based on InSAR technology

斜坡变形识别对于防灾减灾具有重要意义,然而复杂的地质条件以及高位隐蔽等客观原因,导致斜坡变形识别难度加大。为深入分析天水市马兰滑坡、水眼寨滑坡及其周边斜坡的变形情况,基于D-InSAR、SBAS-InSAR、PS-InSAR技术,利用PALSAR-1和PALSAR-2存档数据,综合对比地表位移监测数据,识别区域斜坡变形情况。结果显示:天水市区籍河北岸黄土斜坡和南岸部分没有大范围的明显变形。但在局部地段黄土斜坡上可能存在cm-mm级的小变形。水眼寨滑坡和马兰滑坡后缘附近可能存在mm级的小变形,不存在大范围明显变形。研究成果对于天水市城区防灾减灾及风险管控工作具有一定指导意义,同时也为斜坡变形识别工作提供一定参考。

Slope deformation identification is important for disaster prevention and mitigation,however,complex geological conditions and objective reasons such as high levels of concealment make slope deformation identification more difficult.For an in-depth analysis of the deformation of the Malan landslide,Shuiyanzhai landslide and their surrounding slopes in Tianshui,regional slope deformation was identified based on D-InSAR,SBAS-InSAR and PS-InSAR techniques,using PALSAR-1,and PALSAR-2 archived data and a comprehensive comparison of surface displacement monitoring data.The results show that:There is no widespread significant deformation of the loess slopes on the northern bank and the southern part of the river in the city of Tianshui.However,small deformations of the order of cm-mm may be present in local sections of loess slopes.There may be small deformation at the mm scale near the trailing edge of the Shui-eye Chai landslide and the Malan landslide,and no widespread significant deformation.The results of the study are a guide to disaster prevention,mitigation and risk management in urban areas of Tianshui,and also provide a reference for slope deformation identification.