Abstract
Recently, large-scale sudden landslide disasters have occurred more frequently in the western parts of China. These disasters have characteristics of high position and concealment, and it is challenging to solve disaster prevention using the naked eye and traditional geological means. Using GPS surface monitoring instruments to monitor landslide deformation is currently common, but it is limited because of high costs, harsh natural environment, and human interference. With the rise of interferometric synthetic aperture radar (InSAR), the quality of radar satellite data has improved, providing a new way for long-term monitoring and analysis of landslide historical deformation dynamics. This study used Sentinrl-1A data provided by ESA (March 20, 2017– September 28, 2019) to conduct two-dimensional deformation monitoring of an old landslide in Woda Village, Yanbi Township, Jiangda County, Changdu, Tibet, and compared and analyzed two methods for rechecking with onsite engineering geological survey. The results show that detecting the overall and local deformation of the old landslide using InSAR technology is highly consistent with the field survey phenomenon. The deformation of the front and rear edges of the landslide is small, and the deformation of the middle part is large (>-55mm/a). Combined with rainfall data analysis, the landslide deformation and rainfall have a good response law, showing that rainfall affects the resurrection area in the front of the landslide. The overall performance is a partially resurrected traction sliding, and the main accumulation area in front of the old landslide is shown as a strong push from the middle to the front edge. InSAR technology demonstrates the potential of synthetic aperture interferometry in applying landslide monitoring to deformation monitoring results of the landslide and provides new ideas and references for similar old landslide inducement analysis and monitoring and early warning work.
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