Impact of backwater on water surface profile in curved channels
Owing to extensive construction of dams, the impact of backwater on flow may lead to navigation or flood control issues in curved channels. To date, the impact of backwater on the water surface profile in curved channels remains unknown and requires investigation. In this study, experiments were con...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Water Science and Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674237023000558 |
| _version_ | 1797740890895155200 |
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| author | Rui-hua Nie Qi-hang Zhou Wen-jie Li Xing-nian Liu Gang Xie Lu Wang |
| author_facet | Rui-hua Nie Qi-hang Zhou Wen-jie Li Xing-nian Liu Gang Xie Lu Wang |
| author_sort | Rui-hua Nie |
| collection | DOAJ |
| description | Owing to extensive construction of dams, the impact of backwater on flow may lead to navigation or flood control issues in curved channels. To date, the impact of backwater on the water surface profile in curved channels remains unknown and requires investigation. In this study, experiments were conducted in a glass-walled recirculating flume with a length of 19.4 m, a width of 0.6 m, and a depth of 0.8 m, and the impact of backwater on the water surface profile in a 90° channel bend was investigated. The experimental results showed that the backwater degree had a significant impact on the transverse and longitudinal flow depth distributions in the bend. The transverse slope of the flow (Jr) increased linearly with an increase in the Froude number of the approach flow upstream of the bend. Jr increased with the longitudinal location parameter ξ when −0.2 < ξ < 0.5, and decreased with ξ when 0.5 < ξ < 1.2. Furthermore, the results showed that Jr asymptotically decreased to zero with an increase in the degree of backwater. An equation was formulated to estimate the transverse slope of the flow in a 90° bend in backwater zones. |
| first_indexed | 2024-03-12T14:19:02Z |
| format | Article |
| id | doaj.art-f1b278c3494b4efd8811f0ce0296b318 |
| institution | Directory Open Access Journal |
| issn | 1674-2370 |
| language | English |
| last_indexed | 2024-03-12T14:19:02Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Water Science and Engineering |
| spelling | doaj.art-f1b278c3494b4efd8811f0ce0296b3182023-08-20T04:37:36ZengElsevierWater Science and Engineering1674-23702023-09-01163295301Impact of backwater on water surface profile in curved channelsRui-hua Nie0Qi-hang Zhou1Wen-jie Li2Xing-nian Liu3Gang Xie4Lu Wang5State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaNational Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaChina Institute of Water Resources and Hydropower Research, Beijing 100048, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China; Corresponding author.Owing to extensive construction of dams, the impact of backwater on flow may lead to navigation or flood control issues in curved channels. To date, the impact of backwater on the water surface profile in curved channels remains unknown and requires investigation. In this study, experiments were conducted in a glass-walled recirculating flume with a length of 19.4 m, a width of 0.6 m, and a depth of 0.8 m, and the impact of backwater on the water surface profile in a 90° channel bend was investigated. The experimental results showed that the backwater degree had a significant impact on the transverse and longitudinal flow depth distributions in the bend. The transverse slope of the flow (Jr) increased linearly with an increase in the Froude number of the approach flow upstream of the bend. Jr increased with the longitudinal location parameter ξ when −0.2 < ξ < 0.5, and decreased with ξ when 0.5 < ξ < 1.2. Furthermore, the results showed that Jr asymptotically decreased to zero with an increase in the degree of backwater. An equation was formulated to estimate the transverse slope of the flow in a 90° bend in backwater zones.http://www.sciencedirect.com/science/article/pii/S1674237023000558BackwaterCurved channelExperimental modelTransverse slopeWater surface profile |
| spellingShingle | Rui-hua Nie Qi-hang Zhou Wen-jie Li Xing-nian Liu Gang Xie Lu Wang Impact of backwater on water surface profile in curved channels Water Science and Engineering Backwater Curved channel Experimental model Transverse slope Water surface profile |
| title | Impact of backwater on water surface profile in curved channels |
| title_full | Impact of backwater on water surface profile in curved channels |
| title_fullStr | Impact of backwater on water surface profile in curved channels |
| title_full_unstemmed | Impact of backwater on water surface profile in curved channels |
| title_short | Impact of backwater on water surface profile in curved channels |
| title_sort | impact of backwater on water surface profile in curved channels |
| topic | Backwater Curved channel Experimental model Transverse slope Water surface profile |
| url | http://www.sciencedirect.com/science/article/pii/S1674237023000558 |
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