Research On Active Landslide Monitoring Technology Based On High Resolution SAR Image

As one of the important types of geological disasters in China,landslides account for a large proportion of geological disasters.In order to reduce the damage caused by landslides,it is necessary to make a detailed understanding of the landslide's geographical location and its own state,and to predict its future development.In the process of landslide monitoring,InSAR has many unique advantages,such as large coverage area,celerity,convenience,low cost and so on.It can obtain complete ground deformation information in a certain area,and can monitor and identify potential ground deformation information.Under the background of this research,this paper proposes a research on active landslide monitoring technology based on the influence of high-resolution SAR.The specific research content and achievements are as follows:(1)This paper uses 5 scences of the ALOS-2 elevation data,35 scenes of the Sentinel-1 SLC elevation data and 21 scences of descent data which cover the whole study area,using the two-track differential method,Stacking technique and joint pixel sequential interference SAR processing technology to complete the monitoring of active landslide in Maoxian area The monitoring of active landslides identified the spatial distribution and development of landslides in the working area.Combined with the deformation results of the three methods and the known landslide disaster data,45 deformation areas were delineated,and the settlement amount and settlement rate of the suspected landslide area were analyzed.(2)In the process of data processing,a relatively comprehensive InSAR data processing method was formed,and the whole process of landslide monitoring was sorted out.Through the combination of ALOS-2 and Sentinel-1 data,the combination of D-InSAR Stacking and joint pixel sequential interference SAR processing technology,the adverse effects of complex terrain,dense vegetation and poor spatial coherence in mountainous areas were overcome.(3)Based on the results of the comprehensive analysis,the active landslides are mainly distributed on both sides of the bank of the MingJiang River in the middle of Maoxian County.Five landslides with obvious subsidence and seven sections are analyzed.The landslide characteristics of the area are carefully analyzed and combined with the temporal and spatial characteristics of landslide.Finally,it is determined that the current state of the study area is stable and there will be no landslide in a short period of time,but the impact of natural disasters such as heavy rain and earthquakes will be excluded.For this kind of under-stable state,this paper gives concrete prevention measures and puts forward specific suggestions based on prevention and control measures.(4)An exploration of the results of landslide monitoring results was conducted,focusing on the mapping methods of deformation monitoring results,such as the statistics of discrete points processed by InSAR and the production of isoline maps.Based on the data of the study area,the landslide sliding rate and landslide size are analyzed,and the temporal and spatial variation of the important area is analyzed based on the inversion of the external results of the sequence difference interferogram.For the methods of InSAR processing and the results,GIS technology was used to map and display landslide bodies in three dimensions.