Numerical modelling of simultaneous overtopping and seepage flows with application to dike breaching
Numerical modelling of simultaneous overtopping and seepage flows with application to dike breaching
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同时漫溢和渗流的数值模拟及其在堤坝溃决中的应用
DOI：
10.1080/00221686.2018.1442882
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发表时间：
2019
影响因子：
2.3
通讯作者：
Ichiro Kimura
中科院分区：
文献类型：
--
作者：
Shinichiro Onda;Takashi Hosoda;Nenad M. Jacimovic;Ichiro Kimura
洪水期间经常发生漫顶溃堤，对住区和环境造成严重损害。了解堤防溃决的机理，准确预测溃决过程，对于风险管理具有重要意义。本研究建立了一个三维数值模型，用以模拟堤防溃决过程中的漫顶和渗流。将描述自由水流动的控制方程进行了扩展，并应用于模拟多孔介质的过滤。采用非平衡输沙模型模拟河床变形。首先将数值模型应用于实堤绕流，验证模型中的水流部分，然后结合河床变形模型对溃堤进行数值模拟。通过与试验结果的比较，表明该模型能较好地再现溢流和溃堤过程。
Dike failures due to overtopping frequently occur during floods, causing serious damage to settlements and the environment. For risk management, it is of great importance to understand the mechanisms of dike failure and predict this process accurately. In this study, a three-dimensional numerical model is developed to simulate both overtopping and seepage flows during dike breaching. The governing equations describing the free water flow are extended and applied to simulate also the filtration through porous media. A non-equilibrium sediment transport model is utilized for simulation of the bed deformation. The numerical model is firstly applied to flows over a solid embankment in order to validate the flow part of the model, and then the dike breaching is simulated such that the bed deformation model is also incorporated. By comparison with the experimental results, it is shown that the developed model reproduces overflow and the dike failure processes reasonably well.
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