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A Bayesian approach to develop simple run-out distance models: loess landslides in Heifangtai Terrace, Gansu Province, China

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Abstract

Due to their practicability, simple and data-driven empirical models have been extensively developed and applied in practical engineering to predict the run-out distance of landslides. However, the definition of the most appropriate empirical model for specific landslide data is rarely discussed. Moreover, the empirical model is subjected to the high variability of landslide data, which should be quantified into the model to provide more reliable predictions. As such, we propose in this paper, a simple, practical, and probabilistic run-out distance prediction method based on an empirical model and Bayesian method. This method was implemented with a regional landslide inventory compiled from 34 loess landslides in Heifangtai Terrace, Gansu Province, China. In this method, we performed a Bayesian model selection to determine the most appropriate empirical model for the compiled database among the possible candidate models adapted from previous literature. Considering the high variability of data, unknown parameters of the empirical model are regarded as random variables, and their posterior distributions are obtained by Bayesian updating with the compiled database. Then, we developed the probabilistic run-out prediction model to evaluate the run-out distance exceedance probability of landslides based on the most appropriate model and its associated posterior random variable information. We utilized data from two recent landslides that occurred in Heifangtai Terrace to validate the performance of the proposed model. In addition, we produced a run-out distance exceedance probability curve using the proposed method for a potential landslide in Heifangtai Terrace, in which the sliding volume interval is estimated using the slo** local base level (SLBL) method. In general, this study presents a practical method for landslide run-out distance analyses within a probabilistic framework, aiming to provide support for risk-based decisions.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Project No. 41977224), the Sichuan Science and Technology Program (Project No. 2021JDR0399), the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Project Nos. SKLGP2020Z013 and SKLGP2021K001), and, partially, by the Spanish Ministry of Science and Innovation, under Grant PID2019-108060RB-I00. Their financial support is greatly appreciated.

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Correspondence to Peng Zeng.

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Sun, X., Zeng, P., Li, T. et al. A Bayesian approach to develop simple run-out distance models: loess landslides in Heifangtai Terrace, Gansu Province, China. Landslides 20, 77–95 (2023). https://doi.org/10.1007/s10346-022-01965-w

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  • DOI: https://doi.org/10.1007/s10346-022-01965-w

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