A partial cell technique for modeling the morphological change and scour
A partial cell technique for modeling the morphological change and scour
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DOI：
10.1016/j.coastaleng.2017.09.006
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发表时间：
2018
影响因子：
4.4
通讯作者：
Z. Peng;Q. Zou;P. Lin
中科院分区：
文献类型：
--
作者：
Z. Peng;Q. Zou;P. Lin
提出了一种基于结构网格的局部单元技术，用于跟踪与海滩形态变化和海岸结构前脚趾冲刷相关的水土界面变形。它允许使用相同的正交结构网格形态，泥沙运输和水动力模型，因此，具有消耗更少的CPU的优势，而不需要调整网格以适应不断变化的海滩形态。提出了一种质量守恒更好的改进的滑坡模型来求解泥沙运动的雪崩行为。trans - vof水动力模型已得到扩展，以适应复杂的水深测量。结合ranss - vof模型、层沙输运模型和部分单元技术的形态模型，对不同的入射波条件、局部水深和底部坡度的解析解和实验室测量结果进行了验证。这项研究揭示了风暴期间垂直海岸结构前海滩形态变化行为的关键过程。模型与数据的比较证明了部分单元技术在捕获水-土壤界面运动方面的鲁棒性。
A novel partial cell technique applied on structured grids is developed to track the deformation of water-soil interface associated with beach morphological change and toe scour in front of coastal structures. It allows the use of the same orthogonal structured grids for morphological, sediment transport and hydrodynamic models therefore, has the advantage of consuming less CPU and without the need to adapt grids to the evolving beach morphology. An improved sand-slide model with better mass conservation is introduced to resolve the avalanche behaviour of the sediment motion. The RANS-VOF hydrodynamic model has been extended to cope with complex bathymetry. The newly developed numerical model suite, coupling the RANS-VOF model, a bedload sediment transport model and a morphological model using the partial cell technique, are validated against the analytical solutions and laboratory measurements for different incoming wave conditions, local water depths and bottom slopes. This study reveals the key processes that govern the behaviour of beach morphology change in front of a vertical coastal structure during storms. The model-data comparisons demonstrate the robustness of partial cell technique to capture the movement of the water-soil interface.