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Article

Analysis of Small and Medium–Scale River Flood Risk in Case of Exceeding Control Standard Floods Using Hydraulic Model

by 1,2,3,†, 4,†, 2, 5, 6, 1,* and 2,6,*
1
School of Engineering, Anhui Agricultural University, Hefei 230036, China
2
School of Ocean Science and Technology, Dalian University of Technology, Panjin 124221, China
3
Guangzhou Pearl River Water Resources Protection Technology Development Co. Ltd., Pearl River Water Resources Commission of the Ministry of Water Resources, Guangzhou 510635, China
4
College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian 116026, China
5
Hydrology and Water Resources Survey Bureau of Zhumadian, Zhumadian 463000, China
6
Jiangsu Smart Factory Engineering Research Center, Huaiyin Institute of Technology, Huaian 223003, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Michalis Diakakis
Water 2022, 14(1), 57; https://doi.org/10.3390/w14010057
Received: 20 November 2021 / Revised: 16 December 2021 / Accepted: 22 December 2021 / Published: 28 December 2021
(This article belongs to the Special Issue Flood and Other Hydrogeomorphological Risk Management and Analysis)
Exceeding control standard floods pose threats to the management of small and medium–scale rivers. Taking Fuzhouhe river as an example, this paper analyzes the submerged depth, submerged area and arrival time of river flood risk in the case of exceeding control standard floods (with return period of 20, 50, 100 and 200 years) through a coupled one– and two–dimensional hydrodynamic model, draws the flood risk maps and proposes emergency plans. The simulation results of the one–dimensional model reveal that the dikes would be at risk of overflowing for different frequencies of floods, with a higher level of risk on the left bank. The results of the coupled model demonstrate that under all scenarios, the inundation area gradually increases with time until the flood peak subsides, and the larger the flood peak, the faster the inundation area increases. The maximum submerged areas are 42.73 km2, 65.95 km2, 74.86 km2 and 82.71 km2 for four frequencies of flood, respectively. The change of submerged depth under different frequency floods shows a downward–upward–downward trend and the average submerged depth of each frequency floods is about 1.4 m. The flood risk maps of different flood frequencies are created by GIS to analyze flood arrival time, submerged area and submerged depth to plan escape routes and resettlement units. The migration distances are limited within 4 km, the average migration distance is about 2 km, the vehicle evacuation time is less than 20 min, and the walking evacuation time is set to about 70 min. It is concluded that the flood risk of small and medium–scale rivers is a dynamic change process, and dynamic flood assessment, flood warning and embankment modification scheme should be further explored. View Full-Text
Keywords: small and medium–scale river; flood risk; submerged area; submerged depth; evacuation plan small and medium–scale river; flood risk; submerged area; submerged depth; evacuation plan
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MDPI and ACS Style

Wang, Z.; Sun, Y.; Li, C.; Jin, L.; Sun, X.; Liu, X.; Wang, T. Analysis of Small and Medium–Scale River Flood Risk in Case of Exceeding Control Standard Floods Using Hydraulic Model. Water 2022, 14, 57. https://doi.org/10.3390/w14010057

AMA Style

Wang Z, Sun Y, Li C, Jin L, Sun X, Liu X, Wang T. Analysis of Small and Medium–Scale River Flood Risk in Case of Exceeding Control Standard Floods Using Hydraulic Model. Water. 2022; 14(1):57. https://doi.org/10.3390/w14010057

Chicago/Turabian Style

Wang, Zixiong, Ya Sun, Chunhui Li, Ling Jin, Xinguo Sun, Xiaoli Liu, and Tianxiang Wang. 2022. "Analysis of Small and Medium–Scale River Flood Risk in Case of Exceeding Control Standard Floods Using Hydraulic Model" Water 14, no. 1: 57. https://doi.org/10.3390/w14010057

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