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Article

A New Dam-Break Outflow-Rate Concept and Its Installation to a Hydro-Morphodynamics Simulation Model Based on FDM (An Example on Amagase Dam of Japan)

1
Graduate School of Science and Technology, Tokai University, Kanagawa 259-1292, Japan
2
Department of Civil Engineering, Tokai University, Kanagawa 259-1292, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Francesca Aureli, Andrea Maranzoni and Gabriella Petaccia
Water 2021, 13(13), 1759; https://doi.org/10.3390/w13131759
Received: 4 May 2021 / Revised: 16 June 2021 / Accepted: 21 June 2021 / Published: 25 June 2021
Dams are constructed to benefit humans; however, dam-break disasters are unpredictable and inevitable leading to economic and human life losses. The sequential catastrophe of a dam break directly depends on its outflow hydrograph and the extent of population centers that are located downstream of an affected dam. The population density of the cities located in the vicinity of dams has increased in recent times and since a dam break hydrograph relies on many uncertainties and complexities in devising a dam-break outflow hydrograph, more researches for the accurate estimation of a dam-break flood propagation, extent and topography change becomes valuable; therefore, in this paper, the authors propose a novel and simplified dam-break outflow rate equation that is applicable for sudden-partial dam breaks. The proposed equation is extensively affected by a dam-break shape. Therefore, the inference of a dam-break shape on a dam-break outflow rate is investigated in the current study by executing hydraulic experiments in a long, dry bed, frictionless and rectangular water channel connected to a finite water tank to acquire a mean break-shape factor. The proposed equation is further validated by regenerating the Malpasset dam-break hydrograph and comparing it to the existing methods and also by installing it on an existing 2D hydro-morphodynamics flood simulation model. Finally, Amagase Dam’s (arch-reaction dam in Japan) break simulation is executed as a case study. The results of the simulations revealed that the greater the height of a dam-break section, the more devastating its flood consequences would be. View Full-Text
Keywords: dam-break simulation; hydro-morphodynamics; dam out-flow rate; amagase dam; shallow water equations; FDM dam-break simulation; hydro-morphodynamics; dam out-flow rate; amagase dam; shallow water equations; FDM
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MDPI and ACS Style

Ahmadi, S.M.; Yamamoto, Y. A New Dam-Break Outflow-Rate Concept and Its Installation to a Hydro-Morphodynamics Simulation Model Based on FDM (An Example on Amagase Dam of Japan). Water 2021, 13, 1759. https://doi.org/10.3390/w13131759

AMA Style

Ahmadi SM, Yamamoto Y. A New Dam-Break Outflow-Rate Concept and Its Installation to a Hydro-Morphodynamics Simulation Model Based on FDM (An Example on Amagase Dam of Japan). Water. 2021; 13(13):1759. https://doi.org/10.3390/w13131759

Chicago/Turabian Style

Ahmadi, Sayed M., and Yoshimichi Yamamoto. 2021. "A New Dam-Break Outflow-Rate Concept and Its Installation to a Hydro-Morphodynamics Simulation Model Based on FDM (An Example on Amagase Dam of Japan)" Water 13, no. 13: 1759. https://doi.org/10.3390/w13131759

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