Abstract:
Objectives: In view of the problem that it is difficult to identify the high hidden landslides by traditional ground investigation methods, the author's team have proposed the “space-air-ground investigation system” of landslide detection and monitoring.It has been applied nationwide with good results.However, there are few academic reports about it. In the study area of Danba County, where landslide disasters are frequent.Therefore,the detection and monitoring of potential landslides based on the space-air-ground investigation system was carried out.
Methods: Firstly, Stacking-InSAR and SBAS-InSAR were combined with high-resolution optical remote sensing to achieve a wide-area "census" of active landslides in the whole study area, and the results of Stacking-InSAR and SBAS-InSAR were compared and analyzed.Subsequently, LiDAR technology (Light Detection and Ranging, LiDAR) and UAV aerial photography technology were used to conduct a "detailed investigation" of landslides in high-risk areas around Danba County, and further "verification" of major landslides through on-site investigation. Finally, SBAS-InSAR technology was used to monitor and analyze the deformation of typical landslides.
Results: 41 active landslides were detected in the study area by using the “space-air-ground investigation system”.They are mainly local resurgence of large ancient landslide accumulations under long-term gravity, river scouring and human engineering activities, etc. Most of the landslide deformations have a good correlation with rainfall.
Conclusions: In the process of identifying landslides by using the "space-air-ground investigation system", it is necessary to give full play to the advantages of each technical means.