Early identification of ridge-top landslide hazards in Jiuzhaigou area using InSAR-LiDAR method

doi:10.13474/j.cnki.11-2246.2023.0128

Abstract

Abstract: In the area of about 4000 km² in Jiuzhaigou area, synthetic aperture radar interferometry (InSAR) and light detection and ranging (LiDAR) are applied to identification of landslide hazards. A total of 344 landslide hazards are identified, including 114 ridge-top landslide hazards, with a deformation rate of -149~120 mm/a during December 2017 and October 2020.Through comprehensive remote sensing and field investigation, it is concluded that most of ridge-top landslide tend to develop in the NE, SE-faced slope with a gradient of 35°~45°. The most elevation difference of ridge-top landslide range from 100 m to 350 m. The slope material is mostly composed of quaternary (Q) unconsolidated deposit with geomorphology of high mountains and valleys eroded by tectonics. Finally, Taking the Zhongchagou ridge-top landslide as an example, the temporal and spatial analysis of the ridge-top landslide based on InSAR-LiDAR method is carried out, and the deformation, shape and situation characteristics of the ridge-top landslide are obtained. This study verified the accuracy and reliability of the comprehensive use of InSAR and LiDAR technology to identify and analyze ridge-top landslide hazards, which can provide scientific basis and reference for disaster prevention and mitigation of landslide hazards.

Key words: Jiuzhaigou, ridge-top landslide hazards, early identification, InSAR, LiDAR, developmental characteristics

CLC Number:

WANG Zhidong, TANG Wei, MA Zhigang, LI Yuchen, YANG Benyong, LI Weiqing, LI Yongxin. Early identification of ridge-top landslide hazards in Jiuzhaigou area using InSAR-LiDAR method[J]. Bulletin of Surveying and Mapping, 2023, 0(5): 9-15.

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