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Modeling compound flooding in coastal systems using a computationally efficient reduced-physics solver: including fluvial, pluvial, tidal, wind- and wave-driven processes
Coastal Engineering ( IF 4.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.coastaleng.2020.103796
Tim Leijnse , Maarten van Ormondt , Kees Nederhoff , Ap van Dongeren

Abstract SFINCS, a new reduced-physics solver to compute compound flooding in coastal systems due to fluvial, pluvial, tidal, wind- and wave-driven processes in a computationally efficient way, is presented and validated for a number of verification and application cases. The model solves simplified equations of mass and momentum, which are driven by storm surge and wave boundary conditions, precipitation rates and upstream river discharges. It includes spatially-varying infiltration and bed roughness terms as well as an absorbing-generating seaward boundary to enable wave-driven flooding. Furthermore, advection and wind stress terms can be included. We demonstrate for the application case of hurricane impact on Jacksonville (Florida, USA) that the observed flooding was a combination of fluvial, pluvial, tidal and wind-driven flooding and that this can be modeled well using the reduced-physics solver. We show that the addition of an advection term to the momentum equations is necessary to model shock flows such as dam breaks but also incident broken waves. Thus, wave-driven flooding can be modeled with high computational efficiency and adequate accuracy as demonstrated for the case of Hernani (the Philippines). The model results show the potential of achieving good accuracy at limited computational expense.

中文翻译:

使用计算效率高的简化物理求解器模拟沿海系统中的复合洪水:包括河流、雨洪、潮汐、风和波浪驱动的过程

摘要 SFINCS 是一种新的简化物理求解器,用于以计算效率高的方式计算沿海系统中因河流、雨洪、潮汐、风和波浪驱动的过程而引起的复合洪水,并针对许多验证和应用案例进行了验证。该模型求解由风暴潮和波浪边界条件、降水率和上游河流流量驱动的质量和动量的简化方程。它包括空间变化的入渗和河床粗糙度项以及产生吸收的向海边界,以实现波浪驱动的洪水。此外,可以包括平流和风应力项。我们在飓风对杰克逊维尔(美国佛罗里达州)的影响的应用案例中证明,观察到的洪水是河流、雨洪、潮汐和风力驱动的洪水,并且可以使用简化物理求解器很好地建模。我们表明,在动量方程中添加平流项对于模拟冲击流(如大坝溃决和入射破碎波)是必要的。因此,如 Hernani(菲律宾)的案例所证明的那样,可以以高计算效率和足够的精度模拟波浪驱动的洪水。模型结果显示了以有限的计算成本实现良好精度的潜力。正如 Hernani(菲律宾)的案例所证明的那样,可以以高计算效率和足够的精度模拟波浪驱动的洪水。模型结果显示了以有限的计算成本实现良好精度的潜力。正如 Hernani(菲律宾)的案例所证明的那样,可以以高计算效率和足够的精度模拟波浪驱动的洪水。模型结果显示了以有限的计算成本实现良好精度的潜力。
更新日期:2021-01-01
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