Effect of Rainfall, Runoff and Infiltration Processes on the Stability of Footslopes

To analyze the effect of runoff on shallow landslides, a model coupling one-dimensional rainfall–runoff and two-dimensional infiltration was established to simulate rainfall, infiltration, and runoff processes. Based on Bishop’s limit equilibrium method, the slope failure of a hypothetical footslope...

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Bibliographic Details
Published in:Water (Basel) 2020-05, Vol.12 (5), p.1229
Main Authors: Chen, Hung-En, Chiu, Yen-Yu, Tsai, Tung-Lin, Yang, Jinn-Chuang
Format: Article
Language:English
Subjects:
Computer simulation
Environmental aspects
Equilibrium
Failure
Groundwater
Hydraulics
Hydrographs
Hydrology
Inflow
Kinematics
Landslides
Landslides & mudslides
Mathematical models
Moisture content
Numerical models
Rain
Rainfall
Runoff
Shear strength
Simulation
Slopes (Landforms)
Stability analysis
Studies
Surface runoff
Surface water
Two dimensional models
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Summary:To analyze the effect of runoff on shallow landslides, a model coupling one-dimensional rainfall–runoff and two-dimensional infiltration was established to simulate rainfall, infiltration, and runoff processes. Based on Bishop’s limit equilibrium method, the slope failure of a hypothetical footslope was studied. First, conditions with and without inflow were compared. The results reveal a remarkable difference in factors of safety (FS) between the two conditions, suggesting that considering the effect of runoff is crucial for landslide modeling. In terms of a series of tests of the various magnitudes, durations, lag-time, and peak position of the hydrograph, analyses show that larger inflow leads to more accumulated infiltration and triggers landslides earlier. A long-term duration inflow decreases the stability more than short intensive inflow does. With subsequent surface inflow, slope failure may occur after rainfalls stop, owing to the inflow, and the shape of inflow hydrographs could slightly affect the variance in FS. Results also indicate the necessity of considering the surface runoff when using a numerical model to analyze landslide, particularly on a footslope.
ISSN:2073-4441
2073-4441
DOI:10.3390/w12051229