摘要
2015年尼泊尔Mw 7.8大地震诱发了大量的山体滑坡,对尼泊尔境内与周边地区造成了严重的影响。选取离震中较近的辛杜帕尔乔克地区作为研究区,基于L波段ALOS-2和C波段Sentinel-1A两种合成孔径雷达数据,采用堆叠合成孔径雷达干涉测量(interferometric synthetic aperture radar,InSAR)技术开展震后滑坡的探测与识别,结合光学影像圈定出滑坡隐患点14处。在此基础上,联合升降轨数据和多维小基线集(multidimensional small baseline subset,MSBAS)-InSAR技术获取了典型滑坡的二维时间序列形变特征,结果表明,该典型滑坡的主要形变发生在水平东西向,最大形变速率为-69 mm/a。同时,通过对该典型滑坡时间序列中的趋势项与周期项形变信号进行分析,发现地震对于滑坡运动具有明显的加速作用,且降雨量的增加使得滑坡位移在每年的8月-11月呈现出周期性变化,可为震后滑坡监测研究提供参考。
Objectives In 2015,the Mw 7.8 earthquake in Nepal caused landslides and seriously impacted Nepal and its surrounding areas.Methods In this paper,the Sindhupalchowk area,which is close to the epicenter of the earthquake,is selected as the study area.First,based on the L-band ALOS-2 and C-band Sentinel-1A synthetic aperture radar data,the detection and identification of post-earthquake landslides are carried out by using stacking-InSAR(interferometric synthetic aperture radar)technology.Second,the two-dimensional time series deformation characteristics of a typical landslide are obtained by combining the ascending and descending orbit data and multi-dimensional small baseline subset-InSAR technology.Results Combined with optical images,14 hidden points of landslide are delineated.The main deformation of the typical landslide occurs in the horizontal east-west direction,and the maximum deformation rate is-69 mm/a.Conclusions By analyzing the trend and periodic term deformation signals in time series of the typical landslide,it is found that the earthquake has a significant acceleration effect on the landslide movement,and the increase of rainfall makes the landslide displacement show a periodic change from August to November every year.This paper can provide a reference for post-earthquake landslide monitoring research.
作者
杨成生
李晓阳
张勤
魏云杰
李祖锋
朱赛楠
YANG Chengsheng;LI Xiaoyang;ZHANG Qin;WEI Yunjie;LI Zufeng;ZHU Sainan(School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China;China Institute of Geo-Environment Monitoring,Beijing 100081,China;PowerChina Northwest Engineering Co.Ltd.,Xi'an 710065,China)
出处
《武汉大学学报（信息科学版）》
EI
CAS
CSCD
北大核心
2023年第10期1684-1696,共13页
Geomatics and Information Science of Wuhan University
基金
国家重点研发计划(2021YFC3000404)
国家自然科学基金(42174032)
中央高校基本科研业务费项目(30102262206)。
关键词
尼泊尔
堆叠InSAR技术
多维短基线集技术
滑坡识别
形变监测
Nepal
stacking-InSAR
multidimensional small baseline subset(MSBAS)
landslide identification
deformation monitoring
作者简介
第一作者:杨成生,博士,教授,主要从事地质灾害监测与机理反演相关方面的研究。yangchengsheng@chd.edu.cn;通讯作者:李晓阳,硕士。1610751021@qq.com。
