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[1]Ji Qin,Tong Liyuan.Study on soil erosion in typical riparian zones of Three Gorges Reservoir based on time-series InSAR[J].Research of Soil and Water Conservation,2025,32(06):96-104,112.[doi:10.13869/j.cnki.rswc.2025.06.029]

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Study on soil erosion in typical riparian zones of Three Gorges Reservoir based on time-series InSAR

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 06 Page number: 96-104,112 Column: Public date: 2025-10-20

Title:: Study on soil erosion in typical riparian zones of Three Gorges Reservoir based on time-series InSAR

Author(s):: Ji Qin^1,2,Tong Liyuan¹; (1.School of Geography and Tourism,Chongqing Normal University,Chongqing 401331,China;2.Key Laboratory of GIS Application Research,Chongqing Normal University,Chongqing 401331,China)

Keywords:: riparian zone; soil erosion; time-series InSAR; Three Gorges Reservoir Area

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2025.06.029

Abstract:: [Objective] Soil erosion in the riparian zone of the Three Gorges Reservoir exhibits strong spatiotemporal heterogeneity, making it difficult for traditional methods to achieve wide coverage, long time series, and high spatiotemporal resolution simultaneously. While the Small Baseline Subset Interferometric Synthetic Aperture Radar(SBAS-InSAR) technology is widely used for monitoring subtle surface deformations and subsidence, it has rarely been applied in soil erosion research. This study applies this technology to investigate soil erosion in the Three Gorges Reservoir's riparian zone, aiming to reveal the spatiotemporal evolution patterns of soil erosion and provide scientific basis for regional ecological conservation and erosion modeling. [Methods] Using SBAS-InSAR technology, this study monitored soil erosion characteristics in the riparian zone of Donghe River in the Three Gorges Reservoir Area from 2017 to 2022. Additionally, reliability analysis of SBAS-InSAR observed results was conducted to explore the feasibility of applying the SBAS-InSAR technology to dynamic monitoring and research on soil erosion in the riparian zones. [Results](1) The overall soil erosion rate in the Donghe River riparian zone was less than 10 mm/a. Spatially, erosion first weakened and then strengthened from north to south. Temporally, relatively significant erosion activities occurred in late March annually, with some sediment accumulation observed in June, followed by general erosion from mid-July to October. After water impoundment in the reservoir in October, sediment accumulation became predominant.(2) During the study period, the soil erosion rate in the Donghe River riparian zone showed a decreasing trend with increasing elevation.(3) In different river sections(convex banks, concave banks, and straight sections) of the Donghe River riparian zone, higher erosion rates were observed in late March, and the scouring effect in the riparian zone was further enhanced from June to July. [Conclusion] The soil erosion process in the Donghe River riparian zone exhibits significant spatiotemporal heterogeneity. The long-term deformation monitoring capability of the SBAS-InSAR technology overcomes the limitation of traditional point-based observations in capturing dynamic erosion processes, providing new approaches for soil erosion research in riparian zones.

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Last Update: 2025-12-10