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Simulating storm surge and compound flooding events with a creek-to-ocean model: Importance of baroclinic effects
Ocean Modelling ( IF 3.2 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.ocemod.2019.101526
Fei Ye , Yinglong J. Zhang , Haocheng Yu , Weiling Sun , Saeed Moghimi , Edward Myers , Karinna Nunez , Ruoyin Zhang , Harry V. Wang , Aron Roland , Kevin Martins , Xavier Bertin , Jiabi Du , Zhuo Liu

Abstract We present a creek-to-ocean 3D baroclinic model based on unstructured grids that aims to unite traditional hydrologic and ocean models in a single modeling platform, by taking full advantage of the polymorphism (i.e. a single model grid can seamlessly morph between full 3D, 2DV, 2DH and quasi-1D configurations). Using Hurricane Irene (2011)’s impact on the Delaware Bay as an example, a seamless 2D–3D model grid is implemented to include the entire US East Coast and Gulf of Mexico with a highly resolved Delaware Bay (down to 20-m resolution). The model is forced by flows from a hydrological model (National Water Model ) at the landward boundary. We demonstrate the model’s accuracy, stability and robustness with the simulation of the storm surge and subsequent river flooding events and compound surges. Through a series of sensitivity tests, we illustrate the importance of including in the simulation the baroclinic effects, as provided by the large-scale Gulf Stream, in order to correctly capture the adjustment process following the main surge and the subsequent compound flooding events. The baroclinicity can explain up to 14% of the elevation error during the adjustment phase after the storm.

中文翻译:

使用小溪到海洋模型模拟风暴潮和复合洪水事件:斜压效应的重要性

摘要 我们提出了一种基于非结构化网格的小溪到海洋 3D 斜压模型,旨在通过充分利用多态性(即单个模型网格可以在全 3D 、2DV、2DH 和准 1D 配置)。以飓风艾琳 (2011) 对特拉华湾的影响为例,实施了无缝 2D-3D 模型网格,以包括整个美国东海岸和墨西哥湾以及高分辨率的特拉华湾(分辨率低至 20 米) )。该模型是由来自陆地边界的水文模型(国家水模型)的流量所驱动。我们通过模拟风暴潮和随后的河流洪水事件和复合潮来证明模型的准确性、稳定性和稳健性。通过一系列的敏感性测试,我们说明了在模拟中包含由大规模墨西哥湾流提供的斜压效应的重要性,以便正确捕捉主浪涌和随后的复合洪水事件之后的调整过程。在风暴过后的调整阶段,斜压可以解释高达 14% 的高程误差。
更新日期:2020-01-01
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