Well-balancedand flexible modelling of swash hydrodynamics and sediment transport.
Well-balancedand flexible modelling of swash hydrodynamics and sediment transport.
复制标题
平衡且灵活的冲流流体动力学和沉积物输送形态建模
DOI：
10.1016/j.coastaleng.2014.10.010
复制
发表时间：
2015
影响因子：
4.4
通讯作者：
Yue Zhiyuan
中科院分区：
文献类型：
--
作者：
Hu Peng;Li Wei;He Zhiguo;Pahtz Thomas;Yue Zhiyuan
现有的数值模型的冲流区是相对不灵活的，在处理泥沙输运，由于高度依赖于经验的泥沙输运关系的部署的数值方案。此外，这些模型通常不平衡，这意味着它们无法正确模拟静态流量。在这里，一个平衡和灵活的形态模型的冲洗区。非线性浅水方程和Exner方程离散的激波捕捉有限体积法，其中的数值通量和床面坡度源项估计的SLIC（斜率有限中心）计划，不依赖于经验输沙关系的平衡版本。通过对静止海岸流的模拟，验证了该方法的良好平衡性。模型在再现关键参数（即，理论岸线位置、冲淤深度、流速、漫顶流量、海滩变化深度和输沙率）与解析解、实验数据以及以往的数值解进行比较，结果令人满意。这项工作有利于改进的模型框架的水动力学和泥沙输运。
Existing numerical models of the swash zone are relatively inflexible in dealing with sediment transport due to a high dependence of the deployed numerical schemes on empirical sediment transport relations. Moreover, these models are usually not well-balanced, meaning they are unable to correctly simulate quiescent flow. Here a well-balanced and flexible morphological model for the swash zone is presented. The nonlinear shallow water equations and the Exner equation are discretized by the shock-capturing finite volume method, in which the numerical flux and the bed slope source term are estimated by a well-balanced version of the SLIC (slope limited centered) scheme that does not depend on empirical sediment transport relations. The satisfaction of the well-balanced property is demonstrated through simulating quiescent coastal flow. The quantitative accuracy of the model in reproducing key parameters (i.e., the notional shoreline position, the swash depth, the flow velocity, the overtopping flow volume, the beach change depth and the sediment transport rate) is shown to be satisfactory through comparisons against analytical solutions, experimental data as well as previous numerical solutions. This work facilitates an improved modeling framework for the swash hydrodynamics and sediment transport.