摘要
库岸潜在滑坡变形分析是保障国家水利水电设施安全运行的重要环节,针对仅利用单一轨道SAR数据对库岸潜在滑坡变形监测不准确的问题,采用SBAS-InSAR技术,联合升降轨Sentinel-1 SAR数据构建研究区2019年7月至2021年7月的雷达视线方向形变时间序列,并结合无人机野外调查,分析白鹤滩水电站库岸典型潜在滑坡的变形特征。结果表明:(1)受蓄水因素影响,白鹤滩水电站库岸潜在滑坡形变平均增速达10 mm/a以上,库岸稳定性受到破坏;(2)蓄水量变化是当前库岸滑坡发育的关键性诱因,在蓄水和降雨等因素共同作用下,白鹤滩水电站库岸潜在滑坡存在失稳风险;(3)升降轨SAR数据结合的方式能有效克服单一轨道导致的几何畸变等问题,使水电站库岸潜在滑坡变形监测更加准确、全面。研究结果有助于了解库区蓄水对库岸潜在滑坡变形趋势的影响,可为区域尺度防灾应急管理提供科学支持。
The analysis of potential landslide deformation on the reservoir bank is an important link to ensure the safe operation of national water conservancy and hydropower facilities. In response to the problem of inaccurate monitoring of potential landslide deformation on the reservoir bank using single-track SAR data only, this paper uses SBAS-InSAR technology to construct the radar line-of-sight directional deformation of the study area from July 2019 to July 2021 by combining elevatedtrack Sentinel-1 SAR data time series, and unmanned aircraft field surveys were combined to analyse the deformation characteristics of typical potential landslides on the reservoir bank of Baihetan hydropower station. The results show that:(1) under the influence of water storage factors, the average growth rate of potential landslide deformation on the reservoir bank of Baihetan hydropower station reaches more than 10 mm/a. Reservoir bank stability is undermined;(2) water storage changes are the key causal factor in the development of reservoir bank potential landslides at present. The potential landslides on the reservoir bank of Baihetan Hydropower Station are at risk of instability with the joint effect factors such as water storage and rainfall;(3) the method which combined lift-track SAR data can effectively overcome the problems such as geometric distortion caused by a single track, and make the monitoring of potential landslide deformation on the reservoir bank of hydropower station more accurate and comprehensive. The research result can help to understand the impact of reservoir storage on the deformation trend of reservoir bank potential landslides, and can provide scientific support for regional-scale disaster prevention and emergency management.
作者
杨正荣
喜文飞
史正涛
肖波
周定义
YANG Zhengrong;XI Wenfei;SHI Zhengtao;XIAO Bo;ZHOU Dingyi(Faculty of Geography,Yunnan Normal University,Kunming,Yunnan 650500,China;Key Laboratory of Early Rapid Identification,Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan Province,Kunming,Yunnan 650093,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming,Yunnan,650093,China.;School of Highway and Architectural Engineering,Yunnan Communications Vocational and Technical College,Kunming,Yunnan 650500,China)
出处
《中国地质灾害与防治学报》
CSCD
2022年第5期83-92,共10页
The Chinese Journal of Geological Hazard and Control
基金
云南省科技厅面上项目(202001AT070059)
云南省自然科学基金重点项目(202101AS070019)。
关键词
SBAS-InSAR技术
滑坡灾害
地表形变
变形分析
白鹤滩水电站
SBAS-InSAR technology
landslide disaster
the surface deformation
deformation analysis
baihetan hydropower station
