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Mechanism of Rainfall-Induced Landslides and Its Implications to Landslide Prediction
Author(s): Ma Tuhua, Zheng Aiping, Li Changjiang
Pages: 39-
43,71
Year: 2014
Issue:
1
Journal: Bulletin of Science and Technology
Keyword: rainfall-triggered landslides; effective stress; granular flow; non-linear system;
Abstract: According to the principle of effective stress, for rainfall-induced landslides, the small and shallow landslides are mostly controlled by the cohesive strength; the large and deep landslides are controlled by friction. For the prediction of rainfall-triggered landslides, the measuring of antecedent precipitation and soil moisture is a highly important issue for most landslide-prone areas. Because under a given rainfall condition, the various environmental factors affecting critical pore-water pressure needed to trigger landslides, such as geology, topography, soil deposits, land cover and so on, vary spatially in a region, the probability of rainfall-induced landslide occurrence varies from location to location. From the understanding of granular flow in current physics, it is suggested that landslides induced by the rainfall are involved in a complex non-linear system. If rainfall and the environmental factors are taken as input to the system, landslides are considered as the output variables of the system, and then the relationship between the input and the output is non-linear. Thus, the forecast issues for rainfall-induced landslides should be treated with a non-linear method rather than traditional statistical procedures and process-based deterministic models.
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