|Table of Contents|

Thickness Estimation of Xiongba Landslide in Gongjue Area of Tibet, China by Combining InSAR and Mass Conservation Method(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第03期
Page:
535-547
Research Field:
大地测量、遥感与地学大数据
Publishing date:

Info

Title:
Thickness Estimation of Xiongba Landslide in Gongjue Area of Tibet, China by Combining InSAR and Mass Conservation Method
Author(s):
ZHU Wu1; 2; 3;  YANG Lu-yao1;  ZHANG Jin-min1;  LI Zhen-hong1; 2; 3;  XU Xuan-yu1
(1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Key Laboratory of Ecological Geology and Disaster Prevention of Ministry of Natural Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 3. Big Data Center for Geosciences and Satellites, Chang'an University, Xi'an 710054, Shaanxi, China)
Keywords:
InSAR technology;  thickness inversion;  mass conservation method;  three-dimensional deformation field;  slope coordinate system;  spatial geometric parameter;  rheological parameter;  Xiongba landslide
PACS:
P237; P642.22
DOI:
10.19814/j.jese.2022.12081
Abstract:
The landslide thickness is a key parameter for disaster risk assessment, prevention and control. The traditional landslide thickness estimation method can only determine the depth of the local sparse points of the slope, and can not reflect the depth distribution of the whole landslide, and has the problems of high detection cost and low efficiency. Based on this, a method to estimate the thickness distribution of translational landslide was proposed by combining InSAR and mass conservation method, and was applied to Xiongba landslide in Gongjue area of Tibet. The time-series InSAR technology was used to calculate the one-dimensional LOS deformation velocity fields of SAR images of Sentinel-1A ascending orbit and descending orbit, and ALOS-2 ascending orbit, and the slope coordinate system was constructed by combining the SAR imaging parameters and the spatial geometric relationship of the landslide, and the three-dimensional deformation field of the landslide along the slope was calculated. On this basis, the landslide thickness was estimated by combining InSAR three-dimensional deformation field and mass conservation criterion. The experiment collected 140 views of Sentinel-1A ascending orbit, 138 views of Sentinel-1A descending orbit and 12 views of ALOS-2 ascending orbit covering Xiongba landslide. The results show that the total movement area of Xiongba landslide is about 5.33 km2; when the rheological parameter is 0.5, the landslide thickness ranges from 0 to 109.57 m, distributes in 9 to 73 m, and the landslide volume is about 3.12×108 m3, the estimated results are consistent with the field measurement results. The method proposed can obtain the continuous thickness distribution of landslides and provide key data support for disaster risk assessment, analysis and prevention.

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Last Update: 2023-05-30