摘要
为揭示水电站蓄水期库岸滑坡形变演变趋势及复活机制,基于白鹤滩库区五里坡滑坡2021年1月—2022年8月共73景Sentinel-1影像,采用SBAS-InSAR技术提取蓄水期二维形变,并使用无人机航测技术对滑坡及次生灾害痕迹进行调查,此外利用GNSS位移实测数据对InSAR形变结果进行对比与补充,综合3种技术结果与库区水位实测数据、地质资料对五里坡滑坡进行精细化分析.结果表明:(1)五里坡滑坡形变与库区蓄水存在强相关性.在蓄水前无明显形变而在蓄水后一个月便发生可见形变,随着水位上涨,坡度方向InSAR形变速率最高达到-153 mm/a,雷达视线方向InSAR最大累积形变量达到121 mm,并表现为由下部形变逐渐带动上部形变的牵引式滑坡特征.结合水位实测数据与GNSS位移监测数据发现滑坡形变与蓄水期水位变化吻合度较高.(2)现场地质调查表明五里坡滑坡为上硬下软的反倾岩质边坡,且坡面岩体风化强烈,下部岩体容易受到库水作用软化发生压缩变形进而导致坡体沿风化层发生牵引式滑动.研究结果可为库岸滑坡蓄水期监测和防治提供科学依据.
In order to reveal the deformation evolution trend and reactivation mechanism of the reservoir bank landslide during the impoundment period,two-dimensional deformation was extracted based on SBAS-InSAR technology and 73 scenes of Sentinel-1 images from January 2021 to August 2022 during the impoundment peri-od in Wulipo landslide area of the Baihetan reservoir.And an unmanned aerial vehicle(UAV)surveying techno-logy was used to investigate the landslide and secondary hazards traces.Then,the GNSS displacement measure-ment data were utilized to compare and complement the InSAR displacement results.Finally,integrating the three technique results with the measured reservoir water level data and geological information,the state of Wulipo landslide was analyzed comprehensively.The results show that(1)The deformation of the Wulipo land-slide is strongly correlated with the reservoir impoundment.There is no significant deformation occurrence be-fore the impoundment,but visible deformation can be observed just one month after the impoundment.Increas-ing along with the water level,the maximum InSAR displacement rate in the slope direction can reach up to 153 mm/a and the maximum cumulative InSAR displacement can reach 121 mm in the radar line of sight direc-tion,behaving a traction-type landslide character from lower deformation gradually to upper deformation.Ana-lyzing by the integration of the measured water level data with GNSS displacement monitoring data,it is found obviously that there is a stronger correlation between the landslide deformation and the water level change dur-ing the impoundment period.(2)According to field geological investigation result,the Wulipo landslide is an in-clined reverse rock mass slope with a hard upper section and a soft lower section,exhibiting an intense weather-ing on the rock of slope surface.A traction-type sliding can take place along the weathering layer due to the ef-fect of the reservoir water on the lower rock mass,causing it soften and compression displacement.The research results can provide a scientific basis for the monitoring and prevention of reservoir bank landslides during the im-poundment period.
作者
史先琳
居安华
戴可人
吴明堂
赵紫薇
卓冠晨
董秀军
冯文凯
SHI Xianlin;JU Anhua;DAI Keren;WU Mingtang;ZHAO Ziwei;ZHUO Guanchen;DONG Xiujun;FENG Wenkai(College of Earth Science,Chengdu University of Technology,Chengdu,Sichuan 610059,China;State Key Laboratory of Geological Disaster Prevention and Geological Environmental Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Zhejiang Huadong Construction Engineering Co.,Ltd.,Hangzhou,Zhejiang 310014,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2023年第11期1164-1175,共12页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(41801391)
四川省自然科学基金杰出青年科学基金资助项目(2023NSFSC1909)
四川省自然科学基金资助项目(2022NSFSC0414)
中国博士后科学基金资助项目(2020M673322)
地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2020Z012)。
关键词
多源遥感
库岸滑坡
SBAS-InSAR技术
无人机航测
GNSS位移监测
蓄水期形变
白鹤滩水电站
multi-source remote sensing
reservoir bank landslide
small baseline subset-interferometric syn-thetic aperture radar(SBAS-InSAR)technology
unmanned aerial vehicle(UAV)aerial survey
