Abstract
This study intends to investigate the influence of the rainfall condition and the stability state of the soil layer on the possible time of occurring shallow landslides by building a prediction model which combines a neural network algorithm with a clustering method based on geomorphological characteristics. Therefore, the periods of shallow landslides for different local areas with various geomorphological features in a watershed can be determined. A classification method according to ground slope, soil characteristic, and drainage area is advocated to divide the watershed into multiple local regions before training the landslide prediction model. In this study, to understand the temporal and spatial variation of unstable areas, a seepage flow model and a slope stability model are jointly adopted. The physical meaning of the machine-learning-based model for predicting the duration and the start time of shallow landslides can be preserved because the model input, namely, the dynamic cumulative unstable area, is provided by conducting the theoretical seepage flow model and analyzing the soil slope stability. The proposed approach can effectively determine the periods when shallow landslides are likely to occur for different regions suggested in this study. Present results also indicate that only some specified regions, prone to induce a significant change of total unstable grids during rains, are required to be tracked and analyzed by the proposed prediction model. According to the results of analyzing the predicted errors of the shallow landslide period (Ps) and the initial time of occurring landslide (Ts), the mean relative error can be controlled within 5.19%, and the R2 can be consistently larger than 0.889 overall. Research findings also demonstrate that the predicted periods in which shallow landslides may occur can predict approximately 82.2% of the observed landslide events in the study watershed.
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Huang, PC. Establishing a shallow-landslide prediction method by using machine-learning techniques based on the physics-based calculation of soil slope stability. Landslides 20, 2741–2756 (2023). https://doi.org/10.1007/s10346-023-02139-y
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DOI: https://doi.org/10.1007/s10346-023-02139-y