基于多源时序InSAR的三峡坝区形变监测分析  

Displacement Monitoring and Analysis of the Three Gorges Dam Area with Multi-Source Time-Series InSAR Technology

作　　者：明祖涛[1] 金源 史绪国 张绍成[1] 吴云龙 MING Zutao;JIN Yuan;SHI Xuguo;ZHANG Shaocheng;WU Yunong(School of Geography and Information Engineering,China University of Geosciences,Wuhan,Hubei 430078,China)

机构地区：[1]中国地质大学地理与信息工程学院,湖北武汉430078

出　　处：《北京理工大学学报》2023年第11期1125-1134,共10页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(42174043,41974096)。

摘　　要：自2003年三峡库区蓄水以来,水位的大幅上升和周期性变化,给三峡大坝及其周边环境的稳定性造成威胁,三峡坝区的形变监测一直备受关注.随着InSAR技术的不断发展,其在基础设施与地质灾害形变监测领域发挥着越来越大的作用.采用时序InSAR技术对获取的2015年-2019年L波段ALOS2 PALSAR2数据集和2015年-2022年C波段Sentinel-1数据集进行处理分析,发现三峡大坝与茅坪溪大坝存在与蓄水相关的周期性形变,振幅约为1.1 mm和3.2 mm,茅坪溪大坝左岸护坡、关门洞地区与银杏沱填埋区分别存在28、40、40 mm/a的显著形变.采用指数衰减模型对银杏沱填埋区形变过程进行拟合,结果表明填埋区可在2040年达到稳定状态。研究表明,InSAR技术有助于加深对地表形变的认识理解,为地质灾害治理与决策提供依据.Since the impoundment of the Three Gorges Reservoir(TGR)in 2003,the stabilities of the dam and bank slopes threaten by the significant increases and periodic fluctuation of water levels had drawn great atten-tions.Interferometric synthetic aperture radar(InSAR)with advantages of wide-coverage and high accuracy dis-placement detection ability had played important role in infrastructure and geological hazard monitoring.In this paper,the displacement of the Three Gorges dam and its surrounding areas was mapped and analyzed with L-band ALOS2 PALSAR2(2015-2019)dataset and C-band Sentinel-1(2015-2022)images based on time-series InSAR technique.Results from both datasets agreed well.The analysis results show that there are periodic dis-placements at the Three Gorges Dam and Maopingxi Dam with amplitudes of 1.1 and 3.2 mm related with water levelfluctuation.There is also an obvious displacement at the left bank of Maopingxi,Guanmendong and Yinxingtuo areas with displacement rate of 28,40 and 40 mm/a,respectively.It was found that the displacement in the Yinxingtuo area was related with consolidation,thus an exponential decay model was employed to model the time series displacement.The model results indicated the displacement of Yinxingtuo area would reach a steady state around 2040.The results show the InSAR technology can clearly us capture the ground displace-ment and enrich the understanding of ground process,provide bases for controlling and judging of geological disaster.

关 键 词：时序InSAR 三峡坝区 水位变化 指数衰减模型 

分 类 号：P236[天文地球—摄影测量与遥感]