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    Breaching Parameters for Earth and Rockfill Dams

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2009:;Volume ( 135 ):;issue: 012
    Author:
    Y. Xu
    ,
    L. M. Zhang
    DOI: 10.1061/(ASCE)GT.1943-5606.0000162
    Publisher: American Society of Civil Engineers
    Abstract: Dam risk analysis is at the heart of dam failure prevention and mitigation. In order to assess dam risk, it is essential to conduct a quantitative analysis of the process of a dam breach, which can be described by such parameters as breach geometry, breaching duration, and peak outflow rate. The main objective of this paper is to develop robust empirical formulas with physical meaning for predicting dam breaching parameters based on past dam failure data. A database of 182 earth and rockfill dam failure cases has been compiled; among these cases nearly one-half are for large dams higher than 15 m. A multiparameter nonlinear regression model is recommended to develop empirical relationships between five breaching parameters (breach depth, breach top width, average breach width, peak outflow rate, and failure time) and five selected dam and reservoir control variables (dam height, reservoir shape coefficient, dam type, failure mode, and dam erodibility). The relative importance of each control variable is evaluated. The dam erodibility is found to be the most important factor, influencing all five breaching parameters. The reservoir shape coefficient and the failure mode also play an important role in the prediction models. Two case studies are presented to show the application of the empirical models developed in this paper.
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      Breaching Parameters for Earth and Rockfill Dams

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    contributor authorY. Xu
    contributor authorL. M. Zhang
    date accessioned2017-05-08T21:46:30Z
    date available2017-05-08T21:46:30Z
    date copyrightDecember 2009
    date issued2009
    identifier other%28asce%29gt%2E1943-5606%2E0000179.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/61931
    description abstractDam risk analysis is at the heart of dam failure prevention and mitigation. In order to assess dam risk, it is essential to conduct a quantitative analysis of the process of a dam breach, which can be described by such parameters as breach geometry, breaching duration, and peak outflow rate. The main objective of this paper is to develop robust empirical formulas with physical meaning for predicting dam breaching parameters based on past dam failure data. A database of 182 earth and rockfill dam failure cases has been compiled; among these cases nearly one-half are for large dams higher than 15 m. A multiparameter nonlinear regression model is recommended to develop empirical relationships between five breaching parameters (breach depth, breach top width, average breach width, peak outflow rate, and failure time) and five selected dam and reservoir control variables (dam height, reservoir shape coefficient, dam type, failure mode, and dam erodibility). The relative importance of each control variable is evaluated. The dam erodibility is found to be the most important factor, influencing all five breaching parameters. The reservoir shape coefficient and the failure mode also play an important role in the prediction models. Two case studies are presented to show the application of the empirical models developed in this paper.
    publisherAmerican Society of Civil Engineers
    titleBreaching Parameters for Earth and Rockfill Dams
    typeJournal Paper
    journal volume135
    journal issue12
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)GT.1943-5606.0000162
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2009:;Volume ( 135 ):;issue: 012
    contenttypeFulltext
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