Subgrid theory for storm surge modeling
Subgrid theory for storm surge modeling
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DOI：
10.1016/j.ocemod.2019.101491
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发表时间：
2019-12
期刊：
影响因子：
3.2
通讯作者：
A. Kennedy;D. Wirasaet;A. Begmohammadi;Thomas Sherman;D. Bolster;J. Dietrich
中科院分区：
文献类型：
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作者：
A. Kennedy;D. Wirasaet;A. Begmohammadi;Thomas Sherman;D. Bolster;J. Dietrich
平均技术被用来产生风暴潮的浅水方程的升级形式，包括次网格修正。这些系统在结构上类似于标准浅水方程，但具有与精细水深测量、地形和流动的整体性质相关的附加项。由于该系统只处理与流动相关的粗尺度变量(如平均流体速度)，因此这些细尺度积分需要闭合来将它们与粗化变量相关联。识别了不同复杂程度的闭包，并针对标准浅水方程的高分辨率解进行了精度测试。结果表明，对于复杂几何形状的粗网格，与标准解相比，子网格闭合项的引入大大提高了模型的精度，从而使新的风暴潮模型成为可能。
Averaging techniques are used to generate upscaled forms of the shallow water equations for storm surge including subgrid corrections. These systems are structurally similar to the standard shallow water equations but have additional terms related to integral properties of the fine-scale bathymetry, topography, and flow. As the system only operates with coarse-scale variables (such as averaged fluid velocity) relating to flow, these fine-scale integrals require closures to relate them to the coarsened variables. Closures with different levels of complexity are identified and tested for accuracy against high resolution solutions of the standard shallow water equations. Results show that, for coarse grids in complex geometries, inclusion of subgrid closure terms greatly improves model accuracy when compared to standard solutions, and will thereby enable new classes of storm surge models.