Early identification of potential landslides in alpine and canyon area based on SBAS-InSAR technology
In recent years,landslides occur frequently in alpine and canyon area,posing a serious threat to people's life and property safety.Early identification of landslide hazard is one of the key and difficult problems in landslide research in alpine and canyon area.Taking Xiangbiling reservoir area in the middle and lower reaches of Niulan River as the research area,based on the SBAS-InSAR technology,on the basis of the terrain visibility analysis,Sentinel-1A data analysis results of lifting and descending rails combined with the complementary method,the early identification of potential landslide hazards was conducted.The results show that the combination of the ascending and descending orbit data can effectively reduce the in-terference of shadow overlay area,and can identify the hidden landslide points in the alpine and canyon area more comprehensively.The average annual deformation rate of radar line of sight direction in the study area is-186～166 mm/a,and 47 hidden landslide points are identified based on the deformation results.It is found that the elevation of 1 400～＜1 600 m,slope of 30°～＜40° and slope direction in the northeast and due south are favorable landforms for landslide development.Most landslides are distributed in the Lower Carboniferous Yanguan Formation.The research results prove the advantages and effectiveness of the com-bination of ascending and descending orbit data and complementary method based on SBAS-InSAR techno-logy in the early identification of landslide hazards in alpine and canyon area,and have the potential to be popularized and applied.
early identification of potential landslidealpine and canyon areaSBAS-InSAR technologyter-rain visibility
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