Abstract
On October 2017, due to continuous rainfall, there was a massive river blockage induced by a landslide in Guang’an Village, Chongqing, China. Long-term monitoring analysis has shown that there remain four strong deformation areas on the slope, which seriously threaten the life and property of nearby residents. In this paper, a granular flow model and an elasto-visco-plasticity model were applied to reproduce and predict the landslide event that hit Guang’an Village. The results showed that the landslide gradually moved along the sliding surface, pushing loose deposits and blocking the Xixi River. The numerical reproduction results of the 2017 event are consistent with the actual slope deformation and failure process and deposit morphology. The simulated maximum depth-averaged velocity of this landslide was approximately 1.89 m/s, and the height of the landslide dam was approximately 10 m. After the landslide occurred in 2017, several large deformation areas appeared in the vicinity of the sliding area, and the right rear side of the sliding mass in area III has the largest deformation volume, accompanied by the most developed surface crack and the most intense deformation. There is a risk that the Xixi river will be blocked again. Therefore, with the same parameter and numerical model, a sliding–pushing–blocking dynamic prediction analysis of the strong deformation area III was conducted. The pushing motion of the mass in this area will reactivate the landslide mass observed in 2017. The maximum depth-averaged velocity of deformation area III was 0.5 m/s, and the maximum depth-averaged velocity of landslide deposition was 0.45 m/s. The length of the blocking dam formed by the mass of deformation area III along river was approximately 780 m, 30 m longer than that in 2017. The predicted height of the landslide dam was 14.5 m, approximately 4.5 m higher than that in 2017. The length of the landslide dam reservoir was predicted to be 2.55 km along the Xixi River, which may submerge the Waping Village. This study supports the landslide hazard prevention, reveals the whole movement process of sliding-pushing-blocking, and provides a new research idea and method for the landslide movement prediction. Hence, this study can serve as a reference for the hazard prevention and mitigation of such chain disasters.
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Acknowledgements
The author would like to thank Professor Yueping Yin from China Institute of Geological Environment Monitoring for his valuable discussion on this landslide.
Funding
This work was supported by the National Key R&D Program of China (ID: 2018YFC1504806 & 2018YFC1504803) and National Natural Science Foundation of China (ID: 42077234).
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Panpan, Q., Bolin, H., Bin, L. et al. Hazard analysis of landslide blocking a river in Guang’an Village, Wuxi County, Chongqing, China. Landslides 19, 2775–2790 (2022). https://doi.org/10.1007/s10346-022-01943-2
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DOI: https://doi.org/10.1007/s10346-022-01943-2