Study on surface deformation of Longyangxia hydropower station reservoir area based on BDS and InSAR

At present, BeiDou Navigation Satellite System (BDS), continuously operation reference sations (CORS) and synthetic aperture radar interferometry (InSAR) are developing rapidly and have a bright future. However, the focus of using the above technology to monitor the deformation of the reservoir area is artificial buildings, which does not verify the availability of BDS or integrate the advantages of CORS technology. In view of this problems, combined with the advantages of BDS and CORS with high temporal resolution and InSAR high spatial resolution, a suitable combined monitoring scheme is explored in Longyangxia reservoir area. The results show that: there is a large area of surface deformation area in Longyangxia reservoir area during the study period, with the maximum subsidence rate of 52.48 mm/a and the maximum uplift rate of 43.60 mm/a. The accuracy of BDS real-time dynamic difference monitoring results is 7.1 mm, and the accuracy of InSAR monitoring results is 4.4 mm, which meet the precision of deformation monitoring It is feasible to use InSAR to screen large area deformation area and combine CORS with BDS for real-time dynamic difference monitoring of key areas.sults is 4.4 mm, which meet the precision of deformation monitoring It is feasible to use InSAR to screen large area deformation area and combine CORS with BDS for real-time dynamic difference monitoring of key areas.