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Open AccessFeature PaperEditor’s ChoiceArticle

Performances of the New HEC-RAS Version 5 for 2-D Hydrodynamic-Based Rainfall-Runoff Simulations at Basin Scale: Comparison with a State-of-the Art Model

1
Lampit (Laboratorio di Modellistica numerica per la Protezione Idraulica del Territorio), Department of Environmental Engineering, University of Calabria, 87036 Rende, Italy
2
Department of Civil Engineering, University of Calabria, 87036 Rende, Italy
3
Department of Civil Engineering and Architecture, University of Pavia, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(9), 2326; https://doi.org/10.3390/w12092326
Received: 23 July 2020 / Revised: 13 August 2020 / Accepted: 15 August 2020 / Published: 19 August 2020
(This article belongs to the Special Issue Research on Mathematical Models of Floods)
The Hydrologic Engineering Centre-River Analysis System (HEC-RAS), developed by the US Army Corps of Engineers, is one of the most known, analyzed and used model for flood mapping both in the scientific literature and in practice. In the recently released version (release 5.0.7), the HEC-RAS model has been enriched with novel modules, performing fully 2-D computations based on the 2-D fully dynamic equations as well as the 2-D diffusion wave equations; moreover the application of rainfall to each cell of the two-dimensional domain is now possible. Contrarily to the common applications for flood propagation in river reach, this specific module has never been analyzed in the literature. Therefore, the main purpose of this work is to assess the potential and the capabilities of the 2-D HEC-RAS model in rainfall-runoff simulations at the basin scale, comparing the results obtained using both the options (fully dynamic equations and diffusion wave equations) to the simulations obtained by using a 2-D fully dynamic model developed by the authors for research purposes. Both models have been tested in a small basin in Northern Italy to analyze the differences in terms of discharge hydrographs and flooded areas. The application of a criterion for hazard class mapping has shown significant variations between the two models. These results provide practical indications for the water engineering community in the innovative research field related to the use of 2-D SWEs at the basin scale. View Full-Text
Keywords: two-dimensional models; HEC-RAS; runoff simulations; flood hazard mapping two-dimensional models; HEC-RAS; runoff simulations; flood hazard mapping
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MDPI and ACS Style

Costabile, P.; Costanzo, C.; Ferraro, D.; Macchione, F.; Petaccia, G. Performances of the New HEC-RAS Version 5 for 2-D Hydrodynamic-Based Rainfall-Runoff Simulations at Basin Scale: Comparison with a State-of-the Art Model. Water 2020, 12, 2326. https://doi.org/10.3390/w12092326

AMA Style

Costabile P, Costanzo C, Ferraro D, Macchione F, Petaccia G. Performances of the New HEC-RAS Version 5 for 2-D Hydrodynamic-Based Rainfall-Runoff Simulations at Basin Scale: Comparison with a State-of-the Art Model. Water. 2020; 12(9):2326. https://doi.org/10.3390/w12092326

Chicago/Turabian Style

Costabile, Pierfranco; Costanzo, Carmelina; Ferraro, Domenico; Macchione, Francesco; Petaccia, Gabriella. 2020. "Performances of the New HEC-RAS Version 5 for 2-D Hydrodynamic-Based Rainfall-Runoff Simulations at Basin Scale: Comparison with a State-of-the Art Model" Water 12, no. 9: 2326. https://doi.org/10.3390/w12092326

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