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Water 2016, 8(11), 545; doi:10.3390/w8110545

On the Simulation of Floods in a Narrow Bending Valley: The Malpasset Dam Break Case Study

1
UNESCO Chair in Water Resources Management and Culture, University for Foreigners of Perugia, 06123 Perugia, Italy
2
Civil Engineering Section, University Niccolò Cusano, 00166 Rome, Italy
3
Department of Civil and Environmental Engineering, University of Perugia, 06125 Perugia, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Y. Jun Xu
Received: 29 June 2016 / Revised: 12 November 2016 / Accepted: 14 November 2016 / Published: 19 November 2016
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Abstract

In this paper, we investigate the performance of three-dimensional (3D) hydraulic modeling when dealing with river sinuosity and meander bends. In river bends, the flow is dominated by a secondary current, which has a key role on the flow redistribution. The secondary flow induces transverse components of the bed shear stress and increases the velocity in outward direction, thus generating local erosion and riverbed modifications. When in river bends, the 3D processes prevail, and a 3D computational fluid dynamics (CFD) model is required to correctly predict the flow structure. An accurate description of the different hydrodynamic processes in mildly and sharply curved bends find a relevant application in meanders migration modeling. The mechanisms that drive the velocity redistribution in meandering channels depend on the river’s roughness, the flow depth (H), the radius curvature (R), the width (B) and the bathymetric variations. Here, the hydro-geomorphic characterization of sharp and mild meanders is performed by means of the ratios R/B, B/H, and R/H, and of the sinuosity index. As a case study, we selected the Malpasset dam break on the Reyran River Valley (FR), as it is perfectly suited for investigating performances and issues of a 3D model in simulating the inundation dynamics in a river channel with a varying curvature radius. View Full-Text
Keywords: flood risk; hydraulic modeling; channel bends; computational fluid dynamics; dam break; meandering streams flood risk; hydraulic modeling; channel bends; computational fluid dynamics; dam break; meandering streams
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Biscarini, C.; Di Francesco, S.; Ridolfi, E.; Manciola, P. On the Simulation of Floods in a Narrow Bending Valley: The Malpasset Dam Break Case Study. Water 2016, 8, 545.

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