王哲, 赵超英, 刘晓杰, 李滨. 西藏易贡滑坡演化光学遥感分析与InSAR形变监测[J]. 武汉大学学报 ( 信息科学版), 2021, 46(10): 1569-1578. DOI: 10.13203/j.whugis20210168
引用本文: 王哲, 赵超英, 刘晓杰, 李滨. 西藏易贡滑坡演化光学遥感分析与InSAR形变监测[J]. 武汉大学学报 ( 信息科学版), 2021, 46(10): 1569-1578. DOI: 10.13203/j.whugis20210168

西藏易贡滑坡演化光学遥感分析与InSAR形变监测

  • 摘要: 2000-04-09中国西藏波密县扎木弄沟发生了巨型山体崩滑事件,堵江截流形成堰塞湖,最终堰塞湖溃决对下游区域造成了严重的破坏。为分析易贡滑坡发生前后地表长时间演化特征,通过长时序光学遥感影像对易贡滑坡灾前灾后特征进行了解译。结果表明,易贡滑坡灾前沟头危岩体发育,沟内大量碎屑物质堆积,并且滑坡物源区在灾害发生前几个月已存在局部崩塌,处于不稳定状态。进一步使用合成孔径干涉测量(interferometric synthetic aperture radar,InSAR)技术监测了易贡滑坡区域2015—2019年地表形变,结果表明扎木弄沟整体处于稳定状态,但在局部区域探测到6个不稳定形变体,其中位于易贡滑坡滑源区的形变体规模与形变最大,风险较高,建议持续开展监测。

     

    Abstract:
      Objectives  A large-scale landslide occurred in Zhamunong Gully, Tibet on April 9, 2000. The landslide dammed the Yigong River and forming a dammed lake. With the breaching of landslide dam, the burst flood caused serious damage to the downstream area. The remote sensing image interpretation and interferometric synthetic aperture radar (InSAR) technique is used to investigate the surface changes of Yigong landslide before and after the event and the current deformations.
      Methods  Firstly, long period optical satellite images are used to interpret the evolution of Yigong landslide from 1968 to 2020. Then, the surface deformation of landslide area from 2015 to 2019 is obtained by InSAR technique.
      Results  Experimental results show that there are massive dangerous rocks at the top of the catchment area, and large amounts of debris accumulated in the middle Zhamunong Gully. Moreover, the source area of landslide was in unstable status, where partial area collapsed a few months before the landslide failure. Deformation map shows that Zhamunong Gully was in a stable state on the whole, but six deformation areas were still detected, among which the biggest one is located in the source area of Yigong landslide with great surface deformation.
      Conclusions  Topographic conditions, earthquake and weathering together led to the occurrence of Yigong landslide. The risk of deformed bodies in the source area is so high that continuous monitoring measures should be taken with concerning the impact of drastic changes in regional environment factors on landslide.

     

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