Identification and Monitoring Analysis of Landslides in the Upper Yellow River Reservoir Area Based on SBAS-InSAR Technology
The geological conditions in the reservoir dam group section of the upper reaches of the Yellow River are complex,with the development of many large landslides.Focusing on the Longyangxia-Yangogorge section in the upper reaches of the Yellow River and based on the investigation of geological conditions and historical landslides in the area and remote sensing interpretation,more than 80 scenes of SENTINEL-1A data from 2018 to 2021 are selected.Using the SBAS-InSAR technique,the deformation rates in the radar line of sight are obtained and converted to deformation rates along the slope direction.Based on this,57 large landslides with slow deformation are identified,and deformation con-centration areas are obtained based on kernel density analysis of deformation rates.The ROC curve indicates a good consis-tency between the concentration areas and historical landslide distributions,with dense historical landslide distributions in deformation concentration areas.On this basis,the Baicitan landslide in the Longyangxia reservoir area is selected as a typical landslide.Typical profiles and deformation points are chosen to analyze the relationship between time-series defor-mation and rainfall and reservoir water level changes.The results show that the Baicitan landslide is affected by rainfall and reservoir water level changes,with a strong correlation between the deformation sequence at the front edge and changes in rainfall and reservoir water level.
landslide identification and monitoringSBAS-InSAR technologytime-series analysiskernel den-sity analysisupper Yellow River Reservoir-Dam cluster segment
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