摘要
针对西藏庞村滑坡2019年4月发现裂缝并持续增大,对附近村民及基础设施产生严重安全威胁,搜集2018年1月3日—2020年7月3日的75景Sentinel-1A降轨数据,利用小基线集(small baseline subset-interferometric synthetic aperture radar,SBAS-InSAR)技术获取滑坡在该时间段内的地表形变信息;并在形变量较大区域内选取特征点,对形变量进行分析,最终将InSAR解译结果与地面调查以及全球导航卫星系统(global navigation satellite system,GNSS)监测站结果进行对比,对解译结果的精度进行验证。结果表明:在所选时间段内,庞村滑坡最大形变速率为-38 mm/年;滑坡体的形变存在明显的分界线,可将其分为三个不同的滑动区;2018年12月和2019年10月两个时间点,滑坡形变有明显的加速现象;与地面监测数据的精度验证表明:SBAS-InSAR解译结果与地面监测结果显示的滑坡形变时间和空间特征一致性,验证了利用Sentinel-1A数据采用SBAS-InSAR技术在特大型滑坡监测和治理中的有效性,为滑坡的治理提供了可靠的技术依据。
For the Pangcun Landslide in Tibet,where cracks were found in April 2019 and continued to increase in size,posing a serious safety threat to nearby villagers and infrastructure,75 scenes of Sentinel-1A descending track data from January 3,2018 to July 3,2020 were collected,and the surface deformation information of the landslide during this time period was obtained by using the small baseline subset-interferometric synthetic aperture radar(SBAS-InSAR)technique,feature points were selected in the area with large deformation variables,and the deformation variables were analyzed.The accuracy of the interpretation results is verified.The results show that:The maximum deformation rate of Pangcun landslide is-38 mm/y in the selected time period;There are obvious dividing lines of landslide deformation,which can be divided into three different sliding zones;There is an obvious acceleration of landslide deformation in two time points,December 2018 and October 2019.The accuracy verification with ground monitoring data shows as follows.The landslide deformation shown by SBAS-InSAR interpretation results and ground.The consistency of the temporal and spatial characteristics of landslide deformation shown by the monitoring results verifies the effectiveness of SBAS-InSAR technology using Sentinel-1A data in the monitoring and management of mega-landslides,which provides a reliable technical basis for the management of landslides.
作者
许东丽
王涛
达瓦桑杰
杨爱平
李金锁
朱建东
XU Dong-li;WANG Tao;DAWA Sang-jie;YANG Ai-ping;LI Jin-suo;ZHU Jian-dong(207 Geological Brigade of Sichuan Bureau of Geology&Mineral Resources,Leshan 614000,China;Sichuan Jia Yuan Rong Chuang Geological Science and Technology Co.,Ltd,Chengdu 610000,China;The Second Geological Unit of the Geological and Mineral Exploration and Development Bureau of Tibet Autonomous Region,Lhasa 850003,China)
出处
《科学技术与工程》
北大核心
2021年第35期14927-14935,共9页
Science Technology and Engineering
基金
国家重点研发计划(2017YFC1501002)。
