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Mathematical Problems in Engineering
Volume 2016, Article ID 3818591, 12 pages
http://dx.doi.org/10.1155/2016/3818591
Research Article

Interactions Study of Hydrodynamic-Morphology-Vegetation for Dam-Break Flows

1School of Ocean Science and Environment, Dalian Ocean University, Dalian, Liaoning 116023, China
2State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China
3State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116025, China
4Yuanyanggou National Ocean Park, Panjin, Liaoning 124010, China

Received 26 July 2016; Revised 26 September 2016; Accepted 16 October 2016

Academic Editor: Angelo Di Egidio

Copyright © 2016 Mingliang Zhang et al. 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.

Abstract

This study models a dam-break flow over a bed by using a depth-averaged numerical model based on finite-volume method and computes the dam-break flow and bed morphology characteristics. The generalized shallow water equations considering the sediment transport and bed change on dam-break flow are adopted in the numerical model, and the vegetation effects on the flow and morphological changes are considered. The model is verified against three cases from the laboratory and field data documented in the literature. The numerical results are consistent with the measured results, which show that the model could accurately simulate the evolution of the dam-break flows and the morphology evolution of bed within a computational domain with complex plant distribution. The results show that the riparian vegetation in the waterway narrows the channel and reduces the conveyance capacity of river. The flood flow is diverted away from the vegetation community toward two sides and forms a weak flow region behind the vegetation domain. The resistance of plants markedly reduces the flow velocity, which directly alters the fluvial processes and influences the waterway morphology.