Uncertainty of rainfall-induced landslides considering spatial variability of parameters |
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| Institution: | 1. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Chang''an University, Ministry of Education, China;2. School of Environmental Science and Engineering, Chang''an University, China;3. Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, USA;4. Department of Safety, Health and Environmental Engineering, National Yunlin University of Science and Technology, Touliu, Yunlin, Taiwan;5. Research Center for Soil and Water Resources and Natural Disaster Prevention, National Yunlin University of Science and Technology, Touliu, Yunlin, Taiwan;6. Key Laboratory for Water Environment and Resources, Tianjin Normal University, Tianjin, China;1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China;2. Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, USA;3. Department of Safety, Health and Environmental Engineering, National Yunlin University of Science and Technology, Touliu, Yunlin, Taiwan;4. Research Center for Soil and Water Resources and Natural Disaster Prevention, National Yunlin University of Science and Technology, Touliu, Yunlin, Taiwan;5. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Chang''an University, Xi''an, China;6. Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, Douliou, Taiwan;7. Key Laboratory for Groundwater and Ecology in Arid and Semi-Arid Areas, China Geological Survey, Xi''an, China;8. Key Laboratory for Water Environment and Resources, Tianjin Normal University, Tianjin, China |
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| Abstract: | A cross-correlation analysis is conducted to determine the impacts of the heterogeneity of hydraulic conductivity Ks, soil cohesion c′ and soil friction angle (tan φ′) on the uncertainty of slope stability in time and space during rainfall. We find the relative importance of tan φ′ and c′ depends on the effective stress. While the sensitivity of the stability to the variability of Ks is small, the large coefficient of variation of Ks may exacerbate the variability of pore-water pressure. Therefore, characterizing the heterogeneity of hydraulic properties and pore-water distribution in the field is critical to the stability analysis. |
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| Keywords: | Rainfall infiltration Slope stability uncertainty Cross correlation Spatial variability Hydraulic conductivity Shear strength |
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