Efficient Identification and Monitoring of Landslides by Time-Series InSAR Combining Single- and Multi-Look Phases

• Published in: Remote sensing (Basel, Switzerland) Vol. 14; no. 4; p. 1026
• Main Authors: Liu, Zijing, Qiu, Haijun, Zhu, Yaru, Liu, Ya, Yang, Dongdong, Ma, Shuyue, Zhang, Juanjuan, Wang, Yuyao, Wang, Luyao, Tang, Bingzhe
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.02.2022
• Subjects: Aerial surveys; Component reliability; Construction; data collection; Datasets; Deformation; Deformation effects; deformation monitoring; Earthquakes; Field investigations; Field tests; Geological hazards; Geology; Global positioning systems; GPS; Hazard mitigation; InSAR; Interferometric synthetic aperture radar; Interferometry; landslide identification; Landslides; Landslides & mudslides; Methods; Monitoring; Mountains; Natural environment; Phases; Risk reduction; Shear strength; single- and multi-look phases; Slope stability; synthetic aperture radar; Time series; time series analysis; Topography; Unmanned aerial vehicles; Vegetation; Bailong River
• ISSN: 2072-4292; 2072-4292
• DOI: 10.3390/rs14041026

Identification and monitoring of unstable slopes across wide regions using Synthetic Aperture Radar Interferometry (InSAR) can further help to prevent and mitigate geological hazards. However, the low spatial density of measurement points (MPs) extracted using the traditional time-series InSAR method in topographically complex mountains and vegetation-covered slopes makes the final result unreliable. In this study, a method of time-series InSAR analysis using single- and multi-look phases were adopted to solve this problem, which exploited single- and multi-look phases to increase the number of MPs in the natural environment. Archived ascending and descending Sentinel-1 datasets covering Zhouqu County were processed. The results revealed that nine landslides could be quickly identified from the average phase rate maps using the Stacking method. Then, the time-series InSAR analysis with single- and multi-look phases could be used to effectively monitor the deformation of these landslides and to quantitatively analyze the magnitude and dynamic evolution of the deformation in various parts of the landslides. The reliability of the InSAR results was further verified by field investigations and Unmanned Aerial Vehicle (UAV) surveys. In addition, the precursory movements and causative factors of the recent Yahuokou landslide were analyzed in detail, and the application of the time-series InSAR method in landslide investigations was discussed and summarized. Therefore, this study has practical significance for early warning of landslides and risk mitigation.