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    Numerical Modeling of Overtopping-Induced Breach of Landslide Dams

    Source: Natural Hazards Review:;2020:;Volume ( 021 ):;issue: 002
    Author:
    Guangze Shen
    ,
    Jinbao Sheng
    ,
    Yan Xiang
    ,
    Qiming Zhong
    ,
    Dewei Yang
    DOI: 10.1061/(ASCE)NH.1527-6996.0000362
    Publisher: ASCE
    Abstract: Landslide dams have a high risk of overtopping failure compared to that of artificial dams. In this study, based on dam morphological characteristics, field investigations, and model tests, a numerical calculation method for overtopping-induced landslide dam breach is proposed. Highlights of the method include consideration of surface erosion rather than headcut erosion as well as a wide variety of dam deposits used to simulate the dam breach process. Variations in soil erodibility with depth as well as erosion mode (one- and two-sided breach) are also considered in the proposed dam breach model. Two landslide dam breaches, Tangjiashan and Xiaogangjian, are examined as case studies to test the proposed model. A comparison of the calculated and measured results shows that the relative errors in peak discharge, final breach width, and time to peak of the two breach cases are all within ±10%. Sensitivity analysis shows that the aforementioned parameters are more or less sensitive to soil erodibility and erosion mode, with soil erodibility being more important than erosion mode. Three other typical landslide dam breach models are compared to the proposed model for the Tangjiashan landslide dam case. All four models can reasonably simulate the breach process, but the proposed model has the smallest relative errors.
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      Numerical Modeling of Overtopping-Induced Breach of Landslide Dams

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4266403
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    contributor authorGuangze Shen
    contributor authorJinbao Sheng
    contributor authorYan Xiang
    contributor authorQiming Zhong
    contributor authorDewei Yang
    date accessioned2022-01-30T20:02:05Z
    date available2022-01-30T20:02:05Z
    date issued2020
    identifier other%28ASCE%29NH.1527-6996.0000362.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4266403
    description abstractLandslide dams have a high risk of overtopping failure compared to that of artificial dams. In this study, based on dam morphological characteristics, field investigations, and model tests, a numerical calculation method for overtopping-induced landslide dam breach is proposed. Highlights of the method include consideration of surface erosion rather than headcut erosion as well as a wide variety of dam deposits used to simulate the dam breach process. Variations in soil erodibility with depth as well as erosion mode (one- and two-sided breach) are also considered in the proposed dam breach model. Two landslide dam breaches, Tangjiashan and Xiaogangjian, are examined as case studies to test the proposed model. A comparison of the calculated and measured results shows that the relative errors in peak discharge, final breach width, and time to peak of the two breach cases are all within ±10%. Sensitivity analysis shows that the aforementioned parameters are more or less sensitive to soil erodibility and erosion mode, with soil erodibility being more important than erosion mode. Three other typical landslide dam breach models are compared to the proposed model for the Tangjiashan landslide dam case. All four models can reasonably simulate the breach process, but the proposed model has the smallest relative errors.
    publisherASCE
    titleNumerical Modeling of Overtopping-Induced Breach of Landslide Dams
    typeJournal Paper
    journal volume21
    journal issue2
    journal titleNatural Hazards Review
    identifier doi10.1061/(ASCE)NH.1527-6996.0000362
    page04020002
    treeNatural Hazards Review:;2020:;Volume ( 021 ):;issue: 002
    contenttypeFulltext
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