Design Flood Calculation Model for Extra-Small Watersheds in Ungauged Basin
Designing floods in ungauged watersheds with limited data is a significant challenge in water conservancy projects. To address this, the method of calculating the design flood peak and flood volume using the weighted average method was proposed, which is based on the instantaneous unit hydrograph me...
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MDPI AG
2025-01-01
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| Series: | Hydrology |
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| Online Access: | https://www.mdpi.com/2306-5338/12/1/9 |
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| author | Yun Wang Zengchuan Dong Xinhua Zhu Wenzhuo Wang Yupeng Liu Ronghao Chen Yunjia He |
| author_facet | Yun Wang Zengchuan Dong Xinhua Zhu Wenzhuo Wang Yupeng Liu Ronghao Chen Yunjia He |
| author_sort | Yun Wang |
| collection | DOAJ |
| description | Designing floods in ungauged watersheds with limited data is a significant challenge in water conservancy projects. To address this, the method of calculating the design flood peak and flood volume using the weighted average method was proposed, which is based on the instantaneous unit hydrograph method and the inference formula method, combined with the characteristics of heavy rainfall floods in ungauged watersheds. The calculation results are analyzed in terms of reasonableness through the distribution pattern of the flood peak modulus under different frequencies of the constructed reservoirs, the relative error analysis, and the HEC-RAS model. Based on the one-day flood process of the adjacent basin, the calculation of deducing the design flood process using the hydrological comparison method was proposed. Taking the “Stormwater Runoff Chart” as the data source, the runoff generation, and concentration model was established with the design flood of Baludi Reservoir in the Gelangram River basin of Menglian, Yunnan Province as the research object. A comparative study of the results of the design floods calculated by different methods was carried out. The results show that the new method can well describe the rainstorm process. The method has better performance in the application to the design flood calculation of ungauged basins due to its consideration of the influence of subsurface conditions. The method not only reduces the construction cost but also improves the safety of the reservoir through a better-fitted design flood calculation. |
| format | Article |
| id | doaj-art-dd4e0d411768472782268aecf60c5af4 |
| institution | Kabale University |
| issn | 2306-5338 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Hydrology |
| spelling | doaj-art-dd4e0d411768472782268aecf60c5af42025-01-24T13:34:54ZengMDPI AGHydrology2306-53382025-01-01121910.3390/hydrology12010009Design Flood Calculation Model for Extra-Small Watersheds in Ungauged BasinYun Wang0Zengchuan Dong1Xinhua Zhu2Wenzhuo Wang3Yupeng Liu4Ronghao Chen5Yunjia He6College of Hydrology and Water Resources, Hohai University, Nanjing 210098, ChinaCollege of Hydrology and Water Resources, Hohai University, Nanjing 210098, ChinaBureau of Water and Drought Disaster Prevention, Yellow River Conservancy Commission of the Ministry of Water Resources, Zhengzhou 450000, ChinaCollege of Hydrology and Water Resources, Hohai University, Nanjing 210098, ChinaZhejiang Institute of Hydraulics and Estuary (Zhejiang Institute of Marine Planning and Design), Hangzhou 310020, ChinaCollege of Hydrology and Water Resources, Hohai University, Nanjing 210098, ChinaCollege of Hydrology and Water Resources, Hohai University, Nanjing 210098, ChinaDesigning floods in ungauged watersheds with limited data is a significant challenge in water conservancy projects. To address this, the method of calculating the design flood peak and flood volume using the weighted average method was proposed, which is based on the instantaneous unit hydrograph method and the inference formula method, combined with the characteristics of heavy rainfall floods in ungauged watersheds. The calculation results are analyzed in terms of reasonableness through the distribution pattern of the flood peak modulus under different frequencies of the constructed reservoirs, the relative error analysis, and the HEC-RAS model. Based on the one-day flood process of the adjacent basin, the calculation of deducing the design flood process using the hydrological comparison method was proposed. Taking the “Stormwater Runoff Chart” as the data source, the runoff generation, and concentration model was established with the design flood of Baludi Reservoir in the Gelangram River basin of Menglian, Yunnan Province as the research object. A comparative study of the results of the design floods calculated by different methods was carried out. The results show that the new method can well describe the rainstorm process. The method has better performance in the application to the design flood calculation of ungauged basins due to its consideration of the influence of subsurface conditions. The method not only reduces the construction cost but also improves the safety of the reservoir through a better-fitted design flood calculation.https://www.mdpi.com/2306-5338/12/1/9ungauged basinextra small watershedsdesign floodflood peak modulusrationality analysis |
| spellingShingle | Yun Wang Zengchuan Dong Xinhua Zhu Wenzhuo Wang Yupeng Liu Ronghao Chen Yunjia He Design Flood Calculation Model for Extra-Small Watersheds in Ungauged Basin Hydrology ungauged basin extra small watersheds design flood flood peak modulus rationality analysis |
| title | Design Flood Calculation Model for Extra-Small Watersheds in Ungauged Basin |
| title_full | Design Flood Calculation Model for Extra-Small Watersheds in Ungauged Basin |
| title_fullStr | Design Flood Calculation Model for Extra-Small Watersheds in Ungauged Basin |
| title_full_unstemmed | Design Flood Calculation Model for Extra-Small Watersheds in Ungauged Basin |
| title_short | Design Flood Calculation Model for Extra-Small Watersheds in Ungauged Basin |
| title_sort | design flood calculation model for extra small watersheds in ungauged basin |
| topic | ungauged basin extra small watersheds design flood flood peak modulus rationality analysis |
| url | https://www.mdpi.com/2306-5338/12/1/9 |
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