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Inter-Model Comparison of Delft3D-FM and 2D HEC-RAS for Total Water Level Prediction in Coastal to Inland Transition Zones
Journal of the American Water Resources Association ( IF 2.4 ) Pub Date : 2021-07-26 , DOI: 10.1111/1752-1688.12952
David F. Muñoz 1 , Dongxiao Yin 2 , Roham Bakhtyar 3 , Hamed Moftakhari 1 , Zuo Xue 2 , Kyle Mandli 4 , Celso Ferreira 5
Affiliation  

Hydrodynamic models play a key role in simulating total water level (TWL), that is, a combination of river flow, tide, surge, wind and wave-induced water level, and representing flood inundation dynamics in coastal areas. An appropriate selection of two-dimensional (2D) models that integrate riverine and estuarine interactions with ocean dynamics is crucial to generate accurate TWL predictions and assist stakeholders and federal agencies in decision making and flood emergency responses. In this study, we compare the performance of two widely used hydrodynamic models (e.g., 2D HEC-RAS and Delft3D-Flexible Mesh [FM]) with respect to their ability of predicting TWL in Delaware Bay, United States. Based on a previously established model configuration, we simulate Hurricane Sandy and Isabel that affected the Bay and led to considerable damages and economic losses. We then evaluate model capabilities with tidal analysis, compare observed vs. simulated TWL and analyze spatiotemporal variations of TWL through scenario-based simulations. Our results suggest that atmospheric forcing input in Delft3D-FM significantly improves TWL predictions as compared to those of 2D HEC-RAS. Furthermore, model simulations with Delft3D-FM can be faster than 2D HEC-RAS by a factor of 6–10. Despite these advantages, 2D HEC-RAS (version 5.07) is a noncommercial software easier to implement and can be a simpler alternative for modeling extreme events when atmospheric forcing is not relevant in the model domain.

中文翻译:

Delft3D-FM 和 2D HEC-RAS 在沿海到内陆过渡区总水位预测中的模型间比较

水动力模型在模拟总水位(TWL)中发挥着关键作用,即河流流量、潮汐、浪涌、风和波浪引起的水位的组合,并代表沿海地区的洪水淹没动态。An appropriate selection of two-dimensional (2D) models that integrate riverine and estuarine interactions with ocean dynamics is crucial to generate accurate TWL predictions and assist stakeholders and federal agencies in decision making and flood emergency responses. 在这项研究中,我们比较了两种广泛使用的水动力模型(例如,2D HEC-RAS 和 Delft3D-Flexible Mesh [FM])在预测美国特拉华湾 TWL 的能力方面的性能。基于先前建立的模型配置,我们模拟了飓风桑迪和伊莎贝尔,它影响了海湾并导致了相当大的破坏和经济损失。然后,我们通过潮汐分析评估模型能力,比较观察到的与模拟的 TWL,并通过基于场景的模拟分析 TWL 的时空变化。我们的结果表明,与 2D HEC-RAS 相比,Delft3D-FM 中的大气强迫输入显着改善了 TWL 预测。此外,使用 Delft3D-FM 进行模型模拟可以比 2D HEC-RAS 快 6-10 倍。尽管有这些优点,但 2D HEC-RAS(5.07 版)是一种更易于实施的非商业软件,并且当大气强迫在模型域中不相关时,它可以成为模拟极端事件的更简单替代方案。通过基于场景的模拟模拟 TWL 并分析 TWL 的时空变化。我们的结果表明,与 2D HEC-RAS 相比,Delft3D-FM 中的大气强迫输入显着改善了 TWL 预测。此外,使用 Delft3D-FM 进行模型模拟可以比 2D HEC-RAS 快 6-10 倍。尽管有这些优点,但 2D HEC-RAS(5.07 版)是一种更易于实施的非商业软件,并且当大气强迫在模型域中不相关时,它可以成为模拟极端事件的更简单替代方案。通过基于场景的模拟模拟 TWL 并分析 TWL 的时空变化。我们的结果表明,与 2D HEC-RAS 相比,Delft3D-FM 中的大气强迫输入显着改善了 TWL 预测。此外,使用 Delft3D-FM 进行模型模拟可以比 2D HEC-RAS 快 6-10 倍。尽管有这些优点,但 2D HEC-RAS(5.07 版)是一种更易于实施的非商业软件,并且当大气强迫在模型域中不相关时,它可以成为模拟极端事件的更简单替代方案。使用 Delft3D-FM 进行模型模拟可以比 2D HEC-RAS 快 6-10 倍。尽管有这些优点,但 2D HEC-RAS(5.07 版)是一种更易于实施的非商业软件,并且当大气强迫在模型域中不相关时,它可以成为模拟极端事件的更简单替代方案。使用 Delft3D-FM 进行模型模拟可以比 2D HEC-RAS 快 6-10 倍。尽管有这些优点,但 2D HEC-RAS(5.07 版)是一种更易于实施的非商业软件,并且当大气强迫在模型域中不相关时,它可以成为模拟极端事件的更简单替代方案。
更新日期:2021-07-26
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