Abstract
In subtropical typhoon-prone regions, landslides are triggered by short-duration intense rainfall and prolonged periods of elevated pore-water pressure. However, fast-moving landslides pose a significant challenge for timely warning because of insufficient data on rainfall triggers and the identification of potential failure sites. Thus, our study introduces an integrated approach that combines a double-index intensity-duration (I-D) threshold, accounting for daily rainfall (R0) and 5-d effective rainfall (R5), with the MC-TRIGRS, a probabilistic physically based model, to analyze fast-moving landslide hazards at a regional scale. This approach is characterized by its innovative features: (i) it employs a double-index model to categorize rainfall events, differentiating between long-term continuous rainfall and short-term intense precipitation; (ii) it utilizes a comprehensive dataset from extensive field investigations to implement the grey wolf optimizer (GWO) -enhanced long short-term memory neural network (LSTM) to predict soil thickness distributions across the study area; and (iii) it adopts the classical Monte Carlo method to calculate failure probabilities under various rainfall scenarios, incorporating randomness in key soil parameters, such as cohesion and internal friction angle. By leveraging geotechnical data from both field and laboratory tests and integrating the accumulated knowledge, these models can be applied to the coastal mountainous basins of Eastern China, a region highly prone to landslides. Our goal was to augment the effectiveness of landslide early warning systems. Particularly, the synergistic use of rainfall empirical statistics and probabilistic physically based slope stability models is poised to bolster real-time control and risk mitigation strategies, providing a robust solution for short-term preparedness.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We wish to thank the Quzhou Kecheng District Natural Resources and Planning Bureau for their assistance. The results of the research activity that Taorui Zeng carried out under the joint supervision of Prof. Yin and Prof. Peduto are reported in the present work.
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This research was funded by the Comprehensive risk warning and control project of geological disasters in small watershed of Kecheng District (ZZCG2021058); National Natural Science Foundation of China (Grant No. 4187752); the National Natural Science Foundation of China (Grant No. 41601563) and National Key R&D Program of China (2023YFC3007201).
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Writing—original draft preparation: [Taorui Zeng]; Writing—review and editing: [Kunlong Yin], [Dario Peduto]; Methodology: [Quanbing Gong], [Liyang Wu]; Investigation: [Yuhang Zhu]. All authors have read and agreed to the published version of the manuscript.
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Zeng, T., Gong, Q., Wu, L. et al. Double-index rainfall warning and probabilistic physically based model for fast-moving landslide hazard analysis in subtropical-typhoon area. Landslides 21, 753–773 (2024). https://doi.org/10.1007/s10346-023-02187-4
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DOI: https://doi.org/10.1007/s10346-023-02187-4