Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China
The local reconstruction of river channels may pose obstacles of flood flow, local eddy currents, or high flow velocity which pose potential threats to human life and infrastructures nearby. In the design of such projects, the effects of local reconstruction of the river channel on flooding are ofte...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/5538059 |
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| author | Haixiao Jing Yongbiao Lang Xinhong Wang Mingyang Yang Zongxiao Zhang |
| author_facet | Haixiao Jing Yongbiao Lang Xinhong Wang Mingyang Yang Zongxiao Zhang |
| author_sort | Haixiao Jing |
| collection | DOAJ |
| description | The local reconstruction of river channels may pose obstacles of flood flow, local eddy currents, or high flow velocity which pose potential threats to human life and infrastructures nearby. In the design of such projects, the effects of local reconstruction of the river channel on flooding are often evaluated by the one-dimensional method, which is based on the formula of one-dimensional nonuniform flow. In this study, a two-dimensional hydrodynamic model based on shallow water equations is employed to investigate the impacts of river reconstruction on flooding in the Ba River, China. The finite volume method and an unstructured triangular mesh are used to solve the governing equations numerically. The numerical model is validated by comparison with the results of a physical model of 1 : 120 scale. The backwater effects and impacts of flood flow fields under two flood frequencies are analyzed by comparing the numerical results before and after local reconstruction. The results show that the backwater length under both 10-year and 100-year floods can be reached up to the upstream boundary of the computational domain. However, the maximum water level rises are limited, and the levees in this river channel are safe enough. The flow velocity fields under both floods are changed obviously after local reconstruction in the Ba River. Areas with the potential for scour and deposition of the river bed are also pointed out. The findings of this study are helpful for the evaluation of flood risks of the river. |
| format | Article |
| id | doaj-art-ca014346bb2b43b5a4218bde78f7f363 |
| institution | DOAJ |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-ca014346bb2b43b5a4218bde78f7f3632025-08-20T03:23:59ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422021-01-01202110.1155/2021/55380595538059Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, ChinaHaixiao Jing0Yongbiao Lang1Xinhong Wang2Mingyang Yang3Zongxiao Zhang4State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, ChinaQinghai Research Institute of Investigation & Design of Water Conservancy & Hydropower, Xining 810001, ChinaState Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, ChinaState Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, ChinaState Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, ChinaThe local reconstruction of river channels may pose obstacles of flood flow, local eddy currents, or high flow velocity which pose potential threats to human life and infrastructures nearby. In the design of such projects, the effects of local reconstruction of the river channel on flooding are often evaluated by the one-dimensional method, which is based on the formula of one-dimensional nonuniform flow. In this study, a two-dimensional hydrodynamic model based on shallow water equations is employed to investigate the impacts of river reconstruction on flooding in the Ba River, China. The finite volume method and an unstructured triangular mesh are used to solve the governing equations numerically. The numerical model is validated by comparison with the results of a physical model of 1 : 120 scale. The backwater effects and impacts of flood flow fields under two flood frequencies are analyzed by comparing the numerical results before and after local reconstruction. The results show that the backwater length under both 10-year and 100-year floods can be reached up to the upstream boundary of the computational domain. However, the maximum water level rises are limited, and the levees in this river channel are safe enough. The flow velocity fields under both floods are changed obviously after local reconstruction in the Ba River. Areas with the potential for scour and deposition of the river bed are also pointed out. The findings of this study are helpful for the evaluation of flood risks of the river.http://dx.doi.org/10.1155/2021/5538059 |
| spellingShingle | Haixiao Jing Yongbiao Lang Xinhong Wang Mingyang Yang Zongxiao Zhang Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China Advances in Materials Science and Engineering |
| title | Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China |
| title_full | Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China |
| title_fullStr | Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China |
| title_full_unstemmed | Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China |
| title_short | Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China |
| title_sort | numerical simulation of effects of river reconstruction on flooding a case study of the ba river china |
| url | http://dx.doi.org/10.1155/2021/5538059 |
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