Long-Term and Emergency Monitoring of Zhongbao Landslide Using Space-Borne and Ground-Based InSAR

Ting Xiao,Weiming Tian,Yunkai Deng,Yonglian Sha,Wei Huang

doi:10.3390/rs13081578

Abstract

This work presents the ideal combination of space-borne and ground-based (GB) Interferometric Synthetic Aperture Radar (InSAR) applications. In the absence of early investigation reporting and specialized monitoring, the Zhongbao landslide unexpectedly occurred on 25 July 2020, forming a barrier lake that caused an emergency. As an emergency measure, the GB-InSAR system was installed 1.8 km opposite the landslide to assess real-time cumulative deformation with a monitoring frequency of 3 min. A zone of strong deformation was detected, with 178 mm deformation accumulated within 15 h, and then a successful emergency warning was issued to evacuate on-site personnel. Post-event InSAR analysis of 19 images acquired by the ESA Sentinel-1 from December 2019 to August 2020 revealed that the landslide started in March 2020. However, the deformation time series obtained from satellite InSAR did not show any signs that the landslide had occurred. The results suggest that satellite InSAR is effective for mapping unstable areas but is not qualified for rapid landslide monitoring and timely warning. The GB-InSAR system performs well in monitoring and providing early warning, even with dense vegetation on the landslide. The results show the shortcomings of satellite InSAR and GB-InSAR and a clearer understanding of the necessity of combining multiple monitoring methods.

Highlights

Published: 19 April 2021The Three Gorge Reservoir (TGR) area in China has complex geological and hydrological environments, resulting in a large number of landslides, such as the famous Xintan landslide [1,2], Qianjiangping landslide [3,4], and Jiweishan landslide [5,6]
The analysis shows the shortcomings of satellite Interferometric Synthetic Aperture Radar (InSAR) and GB-InSAR and a clearer understanding of the necessity of combining multiple monitoring methods
The Zhongbao landslide occurred on 25 July 2020 in Wulong County, Chongqing (China)

Summary

Introduction

The Three Gorge Reservoir (TGR) area in China has complex geological and hydrological environments, resulting in a large number of landslides, such as the famous Xintan landslide [1,2], Qianjiangping landslide [3,4], and Jiweishan landslide [5,6]. Heavy rains and fluctuation in the reservoir level still cause several “unknown” landslides to unexpectedly occur every year [11,12,13]. Landslides with a long history of deformation can be controlled by engineering means or other disaster mitigation methods before major damage occurs [14,15]. For some landslides, the time between the beginning of deformation and destruction is only a few months [16,17]. The surface damage characteristics of a rapid landslide located in a sparsely populated area are not identified, leading to sudden damage and casualties [18,19]

Objectives

Discussion

Conclusion