Effect of coastal boundary representation on basin-scale internal waves
Effect of coastal boundary representation on basin-scale internal waves
复制标题
海岸边界表征对盆地尺度内波的影响
DOI：
10.1080/21664250.2021.1918384
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发表时间：
2021
影响因子：
2.4
通讯作者：
Shintani Tetsuya
中科院分区：
文献类型：
--
作者：
Ito Wataru;Nakayama Keisuke;Shintani Tetsuya
在大尺度沿海环境的数值模拟中，准确地再现科里奥利强迫下的内开尔文波和庞加莱波是至关重要的。因此，对于面波，采用结构和非结构网格模型研究了水平网格表示对Kelvin波和Poincare波的影响。然而，到目前为止，网格表示法对内波的影响还知之甚少，特别是对于采用阶梯状横向边界的结构网格。因此，本研究使用圆形盆地来研究结构化网格对内部Kelvin波和Poincare波的适用性，以排除开放边界的影响，并讨论以Rosbby网格因子表示的数值误差。采用几种不同的网格尺寸进行了结构化网格模拟，结果表明，与非结构化网格模拟相比，结构化网格模拟足够准确地再现了内部的开尔文和庞加莱波。此外，结构化网格模拟也被证实与锥形盆地中的非结构化网格模拟非常吻合，后者表现出更逼真的几何形状。从而表明，当Rossby网格因子大于10时，用结构网格可以精确地分析内波。
In numerical simulations for large-scale coastal environments, it is crucial to accurately reproduce internal Kelvin and Poincare waves under Coriolis forcing. Therefore, for surface waves, the effects of horizontal grid representation on Kelvin and Poincare waves have been investigated using both structured and unstructured grid models. However, the effect of the grid representation on internal waves is poorly understood so far, especially for structured grids which uses a step-like lateral boundary. This study thus investigates the applicability of structured grids into internal Kelvin and Poincare waves using a circular basin to exclude the effect of open boundaries and discusses numerical errors in terms of the Rosbby-grid factor. Several grid sizes were used for a structured grid simulation, which demonstrated that the structured grid simulation reproduced the internal Kelvin and Poincare waves sufficiently accurately compared to those obtained by the unstructured grid simulation. Furthermore, the structured grid simulation was also confirmed to agree very well with the unstructured grid simulation in a conical basin which exhibits more realistic geometry. It was thereby shown the possibility that internal waves can be accurately analyzed using structured grids when the Rossby-grid factor is more than 10.
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