1. Comprehensive investigation of a dangerous counter-tilt landslide in the upper reaches of Jinsha River, China.
- Author
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Xu, Qiang, Li, Zhigang, Zhao, Weihua, Li, Weile, Zhu, Xing, Dong, Xiujun, Yu, Congwei, Li, Weimin, Li, Xueqing, Wang, Xincheng, Lu, Huiyan, Wang, Shouyu, Zhan, Weiwei, Wang, Fengjiao, Peng, Hanlei, and Shen, Baiquan
- Subjects
RAINFALL ,GLOBAL Positioning System ,FIELD research ,LANDSLIDES ,DISASTERS - Abstract
Timely and detailed investigation of dangerous landslides is crucial for preventing catastrophic disasters. On June 29, 2023, the local collapse of the Mengu landslide in the upper reaches of Jinsha River in Qinghai Province, China, drew significant attention due to potential risks. Based on the integrated landslide investigation framework of 'space-air-ground', this study examined the development characteristics of the landslide and gave some conclusions. Optical imagery and InSAR results reveal continuous deformation in the source area of the landslide since the beginning of the monitoring in early 2020. Field surveys indicate that the Mengu landslide developed on an anti-dip slope, and the primary slope deformation mode evolved from toppling to overall shear failures. Landslide deformation is correlated with rainfall, exhibiting accelerated movements during periods of significant short-term precipitation. The high-intensity rainfall event in mid-June was identified as the direct cause of the landslide destruction. The landslide is identified as a retrogressive landslide and is categorized into four stages. Presently, there are three primary trailing-edge sliding boundaries, and the overall risk of failure is not high. However, local sliding at the leading edge poses a high risk. Analysis of GNSS monitoring displacement indicates that the front edge of the landslide is in the initial acceleration stage of deformation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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