Abstract
ABSTRACTThe critical stage in the evaluation of rainfall-induced landslide failure is in formulating reasonable models to better simulate spatiotemporal changes of slopes in the hilly terrains. A physically based model can take into account the contribution of rainfall infiltration and shear strength of saturated soil layer, and therefore help revealing the landslide formation mechanisms. This paper presents a physically based approach to simulate the landslide process triggered by rainstorm. On the basis of previous solutions, we select the simplified infiltration model Slope-Infiltration-Distributed Equilibrium (SLIDE) to illustrate the dynamical relations between factor of safety (FS) and accumulation of rainfall over time. This model is tested with three representative landslide events in the southwest, southeast, and south central of China during rainstorm. Results show that the time of landslide failure predicted from the SLIDE model is consistent with the reality. Meanwhile, this paper illustrates the differences of FS among the different slope gradients in the vicinity of same soil texture and relationship between FS and rainfall accumulation. This work formulates a methodology of rainstorm-induced landslide evaluation and improves upon the existing landslide prediction methods.
Highlights
Under the circumstances of global climate changes, overpopulation, deforestation, tectonic stress, etc., landslide has been the most frequent and severe natural hazard (Guzzetti et al 1999; Heersink 2005)
Parameter values for the Slope-InfiltrationDistributed Equilibrium (SLIDE) model are summarized in table 1
We combined the above three assumptions with the following two simplifications to implement the SLIDE model
Summary
Under the circumstances of global climate changes, overpopulation, deforestation, tectonic stress, etc., landslide has been the most frequent and severe natural hazard (Guzzetti et al 1999; Heersink 2005). China experiences some of the most serious landslides, and has been trapped with the largest number of fatalities in the world (Petley 2012). Over 90,000 hidden threats from landslide failures occur in the south and northwest of China (Huang & Li 2011). Landslides induced by heavy rainfall are the most frequently described event in news reports. Especially heavy rainfall, is a trigger to change the structure of soil and the surrounding conditions of underwater. The lasting heavy rainfall increases soil pore water pressure and decreases soil cohesion in the subsurface, thereby activating the driving forces on the slope (Kirschbaum et al 2012a)
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