Detection and monitoring of landslides along the Xuyong-Gulin Expressway using SBAS InSAR

doi:10.6046/zrzyyg.2023241

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Abstract

The Xuyong-Gulin (Xugu) Expressway, located along the southern margin of the Sichuan Basin, faces complex geological conditions, with its safe operation threatened by geologic hazards. Therefore, the identification and analysis of geologic hazards along the expressway holds great significance. Interferometric synthetic aperture Radar (InSAR) technique enjoys the advantages of all-weather, all-time observation capabilities, wide coverage, and mm-scale surface deformation monitoring, playing an important role in wide-field landslide detection and monitoring. Based on this, this study processed the Sentinel-1 ascending and descending datasets from February 2017 to September 2020 using the small baselines subset (SBAS) InSAR technique. As a result, the surface deformation rates along the expressway were determined, and 18 landslides were identified. The analysis indicates that the deformations of landslides are related to anthropogenic activities. The analytical results also reveal that the combination of ascending and descending datasets allows for more accurate identification of landslide distribution. With the continuous data accumulation and technological development, InSAR is expected to play an increasingly important role in the prevention and control of geologic disasters.

Keywords landslide detection interferometric synthetic aperture Radar Xugu Expressway small baseline subset

ZTFLH:	TP79
	P236

Issue Date: 17 February 2025

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	Chen YANG
	Yuan JIN
	Fei DENG
	Xuguo SHI

Cite this article:

Chen YANG,Yuan JIN,Fei DENG, et al. Detection and monitoring of landslides along the Xuyong-Gulin Expressway using SBAS InSAR[J]. Remote Sensing for Natural Resources, 2025, 37(1): 161-168.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2023241 OR https://www.gtzyyg.com/EN/Y2025/V37/I1/161

Fig.1 Map of the study area

Tab.1 Basic information about Sentinel-1 data

Fig.2 Interferometric combinations

Fig.3 Mean displacement rate of the study area

Fig.4 Comparison between InSAR results and optical images

Fig.5 Mean displacement rate of Jimei tunnel landslide

Fig.6 Time-series displacement at P1 of Jimei tunnel landslide

Fig.7 Mean displacement rate of Fenghuang Village

Fig.8 Time-series displacement at P2 of Fenghuang Village

Fig.9 Mean displacement rate of passenger station landslide

Fig.10 Time-series displacement at P3 of passenger station landslide

Fig.11 Mean displacement rate of Guandizui and Xiaopingzi

Fig.12 Time-series displacement at P4 of Guandizui and P5 of Xiaopingzi

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