Satellite radar observation reveals the spatial distribution and motion characteristics of landslides in Wudongde Reservoir area

doi:10.13474/j.cnki.11-2246.2026.0324

Abstract

Abstract: Water storage in hydropower stations will directly affect the movement status of landslides in the reservoir area.Identifying and monitoring landslides in the reservoir area and revealing the relationship between landslide deformation and influencing factors such as water storage and rainfall is crucial to reducing the threat of landslide disasters to reservoir area residents and hydropower stations.In order to study the impact of water storage in Wudongde hydropower station on landslides in the reservoir area in 2020,this paper uses the Sentinel-1 dataset to detect active landslides in Wudongde Reservoir area based on SBAS-InSAR technology.A total of 25 landslides in the reservoir area are identified,including 10 water wading landslides and 15 non-wading landslides.Most landslides are distributed in areas with an altitude of 2000～5000 m and a slope angle of 1°～40°.In addition,a typical landslide is selected from each of two different types of landslides for deformation time series analysis: the effect of water storage on water wading landslides is analyzed by K-means clustering; and the effect of rainfall on non-water wading landslides is analyzed by wavelet transformation.The results show that water storage is the dominant factor driving accelerated deformation of water wading landslides,and rainfall affects seasonal deformation of non-water wading landslides.The research results of this article can provide reference for landslide disaster warning and prevention in Wudongde Reservoir area.

Key words: Wudongde hydropower station, InSAR, reservoir landslide, inducing factors, K-means cluster, wavelet transformation

CLC Number:

P237
P258

WANG Lidong. Satellite radar observation reveals the spatial distribution and motion characteristics of landslides in Wudongde Reservoir area[J]. Bulletin of Surveying and Mapping, 2026, 0(3): 142-149.

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