Identification of potential landslides in Baihetan Dam area before the impoundment by combining InSAR and UAV survey

doi:10.11947/j.AGCS.2022.20220305

Abstract

Abstract: Baihetan Dam is located in the high and steep mountain area of southwest China, which is an important part of national project “West to East power transmission” in China. The two banks of the reservoir are highly prone to geological disasters, and the traditional geological disaster investigation means have obvious shortcomings, such as low efficiency, high risk, and unable to cover potential hazards in upper slope. The application of space-borne synthetic aperture radar interferometry (InSAR) and unmanned aerial vehicle (UAV) aerial survey technology for the identification of potential landslides in wide-area is of great significance for identifying potential landslides, understanding their distribution characteristics and mitigating the disaster. In this paper, based on 142 Sentinel-1 satellite images, active slopes with clear displacements were identified on both banks of Baihetan Dam area before impoundment by using sequential InSAR technology. Meanwhile, UAV aerial survey technology was used to verify and analyze the active slopes. According to digital aerial photography products such as DEM, DOM and 3D model, and 32 potential landslides were identified. Combined with the factors of displacement magnitude, displacement area, whether the potential landslides are involved in water and the threating objects, the prevention and control suggestions were given, and a comprehensive and accurate database of potential landslides before impoundment was established. Finally, the advantages, application scope and the effective combination strategy of these two technologies are summarized based on this case. This paper reveals that during the combination of the two technologies on the potential landslides identification in wide area, not only can UAV survey verify the displacement area monitored by InSAR, but also InSAR could improve the flight efficiency of aerial survey. By combining the real-time and historical information, displacement and geological information provided by the two technologies, an efficient comprehensive space-air remote sensing strategy for potential landslides identification in wide dam area can be achieved.

Key words: Baihetan Dam, time-series InSAR, UAV survey, identification of potential landslides

CLC Number:

P227

DAI Keren, SHEN Yue, WU Mingtang, FENG Wenkai, DONG Xiujun, ZHUO Guanchen, YI Xiaoyu. Identification of potential landslides in Baihetan Dam area before the impoundment by combining InSAR and UAV survey[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(10): 2069-2082.

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