Numerical extensions to incorporate subgrid corrections in an established storm surge model
Numerical extensions to incorporate subgrid corrections in an established storm surge model
复制标题
将子网格修正纳入已建立的风暴潮模型中的数值扩展
DOI：
10.1080/21664250.2022.2159290
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
Kennedy, Andrew B.
中科院分区：
文献类型：
--
作者：
Begmohammadi, Amirhosein;Wirasaet, Damrongsak;Poisson, Autumn;Woodruff, Johnathan L.;Dietrich, J. Casey;Bolster, Diogo;Kennedy, Andrew B.
淹没模型用计算点的网格表示沿海地区，通常具有不同的流道和屏障分辨率。基于浅水方程粗网格解的模型最近通过使用亚网格修正得到了改进，亚网格修正考虑了较小尺度上的信息（地表高程、粗糙度特征）。本文将已建立的风暴潮模型的数值方法扩展到包括子网格校正。为了保持与现有用户和结果的连续性，模型扩展仅限于提供基本子电网功能所需的那些，并包括两个主要的补充。首先，利用高分辨率地表高程，采用有限体积法对质量和动量方程进行修正。其次，将模型中施加在b网格干湿界面上的无滑移条件修改为滑移条件，以使流动在宽度与单元大小相当的通道中。数值结果表明，这些数值扩展可以显著提高模型对沿海洪水的预测精度，且计算成本较低。
Inundation models represent coastal regions with a grid of computational points, often with varying resolution of flow pathways and barriers. Models based on coarse grid solutions of shallow water equations have been improved recently via the use of subgrid corrections, which account for information (ground surface elevations, roughness characteristics) at smaller scales. In this work, numerical approaches of an established storm surge model are extended to include subgrid corrections. In an attempt to maintain continuity with existing users and results, model extensions were limited to those needed to provide basic subgrid capabilities, and included two major additions. First, a finite volume method is used to incorporate corrections to the mass and momentum equations using high-resolution ground surface elevations. Second, the no-slip condition imposed on the B-grid wet/dry interface in the model is modified to a slip condition to enable flows in channels with widths comparable to cell size. Numerical results demonstrate these numerical extensions can significantly enhance the accuracy of the model’s predictions of coastal flooding, with low additional computational cost.
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DOI：
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影响因子：
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作者：
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