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    Importance of variability in initial soil moisture and rainfalls on slope stability

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    Name:
    HYDROL29915R1.pdf
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    794.5Kb
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    Description:
    Final Accepted Manuscript
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    Author
    Cai, Jing-sen
    Jim Yeh, Tian-Chyi
    Yan, E-chuan
    Tang, Rui-Xuan
    Hao, Yong-Hong
    Huang, Shao-Yang
    Wen, Jet-Chau
    Affiliation
    Univ Arizona, Dept Hydrol & Atmospher Sci
    Issue Date
    2019-04
    Keywords
    Slope stability uncertainty
    Variability
    Initial soil pore water pressure
    Rainfall characteristics
    Large-uncertainty zone
    Low-reliability zone
    
    Metadata
    Show full item record
    Publisher
    ELSEVIER SCIENCE BV
    Citation
    Cai, J. S., Yeh, T. C. J., Yan, E. C., Tang, R. X., Hao, Y. H., Huang, S. Y., & Wen, J. C. (2019). Importance of variability in initial soil moisture and rainfalls on slope stability. Journal of Hydrology, 571, 265-278.
    Journal
    JOURNAL OF HYDROLOGY
    Rights
    © 2019 Elsevier B.V. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    A first-order moment analysis is developed to investigate the temporal and spatial propagation of uncertainty of slope stability during rainfall, considering spatial variabilities in initial soil water pressure and soil hydraulic properties, and temporal variability of rainfall. Results of the analysis indicate that the uncertainties resulting from variabilities in initial soil pore water pressure distributions and rainfalls are comparable with that from the variability in soil hydraulic properties. Further, the evolution of slope stability uncertainty is driven by the mean flow field, and a localized large-uncertainty zone along the slope profile could form, leading to a localized low-reliability zone, which may lead to the failure of the slope. In particular, when the slope is close to saturation, the reliability of the stability analysis of any elevation of the slope is low even at early rainfall times. On the other hand, when the slope is unsaturated and heavy rainfalls occur, the low-reliability zone exists at shallow parts of the slope at early times. The results also show that greater unreliability exists at shallow depths at early times when the rainfall has a descending trend in comparison with uniform and increasing trend. Lastly, the low-reliability zone is always near the impermeable bedrock if rainfall persists.
    Note
    24 month embargo; available online 2 February 2019.
    ISSN
    00221694
    DOI
    10.1016/j.jhydrol.2019.01.046
    Version
    Final accepted manuscript
    Sponsors
    National Natural Science Foundation of China [41672313, 41807264]; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [CUG170686]; China Scholarship Council [201406410032]; Global Expert award through Tianjin Normal University from the Thousand Talents Plan of Tianjin City
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0022169419301131
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jhydrol.2019.01.046
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