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]
基于时序InSAR的三峡水库典型消落带土壤侵蚀研究
- Title:
- Study on soil erosion in typical riparian zones of Three Gorges Reservoir based on time-series InSAR
- 文章编号:
- 1005-3409（2025）06-0096-09
- 分类号:
- S157.1
- 文献标志码:
- A
- 摘要:
- [目的] 三峡水库消落带土壤侵蚀时空异质性强，传统方法难以兼顾大范围、长时间序列及高时空分辨率。SBAS-InSAR技术适用于监测地表微小形变和沉降现象，但鲜有研究将其应用于土壤侵蚀研究中，将该技术运用到三峡水库消落带土壤侵蚀研究中，旨在揭示侵蚀时空演变规律，为区域生态保护和侵蚀建模提供科学依据。[方法] 采用SBAS-InSAR技术，监测2017—2022年三峡库区东河流域消落带土壤侵蚀特征，并对SBAS-InSAR观测结果进行可靠性分析，探究SBAS-InSAR技术应用于消落带土壤侵蚀动态监测与研究的可行性。[结果]（1）东河消落带的土壤侵蚀速率整体小于10 mm/a。空间分布上表现为由北至南先减弱后增强；时间尺度上，每年3月下旬出现较为显著的侵蚀活动，6月有一定程度的泥沙堆积，7月中旬到10月普遍表现为侵蚀，10月水库蓄水之后，普遍表现为泥沙堆积；（2）研究时段东河消落带土壤侵蚀速率随着海拔升高呈降低趋势；（3）东河消落带土壤侵蚀速率在不同河段（凸岸、凹岸和平直地段）表现为3月下旬侵蚀速率较高，6—7月消落带冲刷作用进一步增强。[结论] 东河消落带土壤侵蚀过程具有明显的时空异质性，基于SBAS-InSAR技术的长时序形变监测特点，解决了传统点状观测难以捕捉动态过程的问题，为消落带土壤侵蚀研究提供新的思路与途径。
- 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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备注/Memo
收稿日期：2024-01-06 修回日期：2025-03-25 接受日期：2025-03-28
资助项目：重庆市自然科学基金面上项目（CSTB2023NSCQ-MSX0990）；重庆市教委科学技术研究项目（KJQN202200526；KJZD-K202400510）；重庆师范大学资助项目（23XWB032）联合资助
第一作者：冀琴（1987—），女，山西大同人，博士，副教授，研究方向：3S技术应用。E-mail：yunngy@126.com