A multi-purpose, intra-wave, shallow water hydro-morphodynamic solver
A multi-purpose, intra-wave, shallow water hydro-morphodynamic solver
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DOI：
10.1016/j.advwatres.2011.12.003
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发表时间：
2012-03
影响因子：
4.7
通讯作者：
M. Postacchini;M. Brocchini;A. Mancinelli;M. Landon
中科院分区：
文献类型：
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作者：
M. Postacchini;M. Brocchini;A. Mancinelli;M. Landon
一种水形态动力学数值模型为研究和预测近岸和河流的流动以及波浪和水流推动下的海底变化作出了新的贡献。该模型包括一个用于非线性浅水方程（NSWE）积分的鲁棒流体动力求解器和一个用于求解Exner方程（用于评估海底形态演化）的相当灵活的求解器。详细分析了求解形态动力学问题的现有方法和新的方法。采用顺序分裂的方法对NSWE方程和Exner方程进行了耦合和修正。该模型已通过复制解析和数值解决方案，可在最近的文献，以及内部实验室实验验证。对已有理论解的模拟结果表明，该模型具有较好的预测效果，尤其适用于因溃坝和激流事件导致的床载或悬载运移引起的海床演化。尽管水-形态动力耦合较弱，后者仍被认为同时推动侵蚀和增生。求解结果与实验数据的比较也令人鼓舞，求解器很好地再现了不规则波浪作用下的主要海底特征。
A hydro-morphodynamic numerical model is illustrated as a novel contribution to the investigation and prediction of nearshore and riverine flows and seabed changes forced by waves and currents. The model includes a robust hydrodynamic solver for the integration of the nonlinear shallow water equations (NSWE) and a rather flexible solver for the resolution of the Exner equation (used to evaluate the morphological evolution of the seabed). A detailed analysis is given of existing and novel procedures for the solution of the morphodynamic problem. Coupling of NSWE and Exner equations and updating of the solution is made by means of a sequential splitting scheme. The model has been validated by reproducing both analytical and numerical solutions, available in the recent literature, as well as an in-house laboratory experiment. The simulation of existing theoretical solutions has revealed the model performs well, especially in the prediction of the seabed evolution due to either bed-load or suspended-load transport forced by dam-break and swash-type events. The latter ones are seen to force both erosion and accretion despite the weak hydro-morphodynamic coupling. The comparison between solver results and experimental data is also encouraging, the solver reproducing well the main seabed features forced by irregular waves.