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Arid Land Geography ›› 2026, Vol. 49 ›› Issue (5): 917-927.doi: 10.12118/j.issn.1000-6060.2025.425

• Climate Change • Previous Articles     Next Articles

Probability of landslide disasters induced by rainfall based on Bayesian formula correction

LU Shengdong1(), WANG Wenchun2, HAO Xiaodong3, SUN Lijun3, ZHANG Huaming1   

  1. 1 Shanxi Meteorological Disaster Prevention Technology Center, Taiyuan 030006, Shanxi, China
    2 Shanxi Institute of Meteorological Science, Taiyuan 030002, Shanxi, China
    3 Shanxi Institute of Geological Survey Corporation, Taiyuan 030006, Shanxi, China
  • Received:2025-07-21 Revised:2025-09-10 Online:2026-05-25 Published:2026-05-25

Abstract:

To improve the spatiotemporal probability algorithm for rainfall-induced landslide disasters and improve early warning accuracy, the dataset of rainfall and landslide events in Shanxi, China form 2001 to 2020 was reconstructed by removing samples from the freeze-thaw period and landslides not clearly rainfall-induced. A disaster probability model was developed using logistic regression based on accumulated effective rainfall and rainfall duration. Shanxi Province was divided into five subregions according to the spatial distributions of underlying surface factors; the probability model was corrected using a Bayesian formula to obtain a spatial probability model. The receiver operating characteristic curve (ROC) was applied to determine the critical value of landslide disasters, and the models were validated with data from 2021 to 2023. Finally, interpolation was used to derive the disaster threshold curves for different subregions. The conclusions are as follows: (1) The freeze-thaw period ends in early May in southern Shanxi Province but lasts until mid-June in the north. (2) The ROC curve shows that both the logistic regression and Bayesian formula correction models predict accurately, with the latter performing better; critical probabilities are 61.51% and 60.37%, respectively. (3) The accuracies of the logistic regression and Bayesian formula correction models are 86.44% and 93.22%, respectively, indicating significant improvements with the Bayesian formula correction. (4) Threshold curves across subregions of Shanxi Province decrease with rainfall duration increases. Spatially, landslide thresholds decrease from southwest to northeast across Shanxi Province.

Key words: freeze-thaw period and non-freeze-thaw period, rainfall, landslide disaster, logistic regression, Bayesian formula, threshold