白鹤滩库区水位波动对滑坡形变的影响  

Influence of water level fluctuation on landslide deformation in Baihetan reservoir area

作　　者：王深禾 王世杰 WANG ShenHe;WANG ShiJie(Faculty of Geomatics,Lanzhou Jiaotong University,Lanzhou 730070,China;National and Local Joint Engineering Research Center for Application of Geographic National Conditions Monitoring Technology,Lanzhou 730070,China;Key Laboratory of Science and Technology in Surveying and Mapping,Gansu Province,Lanzhou 730070,China;Academician Expert Workstation of Gansu Dayu Jiuzhou Spatial Information Technology Co.,Ltd.,Lanzhou 730050,China)

机构地区：[1]兰州交通大学测绘与地理信息学院,兰州730070 [2]地理国情监测技术应用国家地方联合工程研究中心,兰州730070 [3]甘肃省测绘科学与技术重点实验室,兰州730070 [4]甘肃大禹九洲空间信息科技有限公司院士专家工作站,兰州730050

出　　处：《地球物理学进展》2025年第1期94-105,共12页Progress in Geophysics

基　　金：国家自然科学基金项目(41861061);兰州交通大学天佑创新团队(TY202001)联合资助.

摘　　要：库区滑坡是国家水电工程安全和地质灾害防治关注的重点问题,在蓄水周期中库区水位变化明显,水位波动对库区滑坡有强烈的触发作用.本文以白鹤滩水电站库区作为研究区,利用Small-Baseline Subset InSAR技术,联合升降轨Sentinel-1 A数据对研究区蓄水前期、中期、后期进行形变监测,研究库区水位变化对滑坡形变的影响.结果表明:(1)通过InSAR技术对研究区进行形变监测,探测出11处不稳定斜坡,最大的形变量达到0.14 m,其中有4处是已知滑坡,对典型滑坡进行形变监测,研究库区水位变化对形变的影响;(2)以跨山滑坡和巧家县滑坡为例研究水位波动与滑坡形变的相关性,通过皮尔逊相关系数研究发现水位大幅变化与滑坡形变速率具有较强的相关性,在蓄水中期两者相关性最高,库区水位上升时候对滑坡形变的影响大于水位下降的时候;(3)以典型滑坡为例,通过小波分析对库区水位和滑坡形变进行滞后性研究,发现库区滑坡形变与水位波动之间存在3~4个月的滞后期.Landslides in the reservoir area are a key issue of national hydropower engineering safety and geological disaster prevention and control.During the water storage cycle,the water level in the reservoir area changes significantly,and water level fluctuations have a strong triggering effect on landslides in the reservoir area.This article takes the Baihetan hydropower station reservoir area as the research area,uses Small-Baseline Subset InSAR technology,combined with Sentinel-1 A data from the lifting rail,to monitor deformation in the early,middle,and late stages of water storage in the research area,and studies the impact of water level changes in the reservoir area on landslide deformation.The results showed that:(1)deformation monitoring was carried out in the study area using InSAR technology,and 11 unstable slopes were detected,with the maximum deformation reaching 0.14 m.Among them,4 were known landslides,and deformation monitoring was carried out on typical landslides to study the impact of water level changes in the reservoir area on deformation;(2)Taking the cross mountain landslide and Qiaojia County landslide as examples,this study investigates the correlation between water level fluctuations and landslide deformation.Through Pearson correlation coefficient research,it is found that there is a strong correlation between significant changes in water level and landslide deformation rate.The correlation between the two is highest in the middle stage of water storage,and the impact of rising water level in the reservoir area on landslide deformation is greater than that of falling water level;(3)Taking a typical landslide as an example,a lag study was conducted on the water level and landslide deformation in the reservoir area through wavelet analysis.It was found that there is a lag period of about three to four months between the landslide deformation and water level fluctuations in the reservoir area.

关 键 词：SBAS-InSAR 水位波动 滑坡 相关性分析 白鹤滩库区 

分 类 号：P237[天文地球—摄影测量与遥感]