Impact of backwater on water surface profile in curved channels

IF 3.7 Q1 WATER RESOURCES

Water science and engineering Pub Date : 2023-09-01 DOI:10.1016/j.wse.2023.04.006

Rui-hua Nie , Qi-hang Zhou , Wen-jie Li , Xing-nian Liu , Gang Xie , Lu Wang

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引用次数: 0

Abstract

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 (J_r) increased linearly with an increase in the Froude number of the approach flow upstream of the bend. J_r 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 J_r 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.

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回水对弯曲河道水面剖面的影响

由于水坝的广泛建设，回水对水流的影响可能导致弯曲河道的航行或防洪问题。迄今为止，回水对弯曲河道水面剖面的影响尚不清楚，需要进一步研究。本研究在长19.4 m、宽0.6 m、深0.8 m的玻璃壁循环水槽中进行实验，研究回水对90°弯道水面剖面的影响。实验结果表明，回水程度对弯道内横向和纵向流动深度分布均有显著影响。随着弯道上游进流弗劳德数的增加，流的横向斜率(Jr)呈线性增加。当- 0.2 <时，Jr随纵向位置参数ξ的增大而增大;ξ& lt;0.5, 0.5 <时随ξ值减小;ξ& lt;1.2. 结果表明，随着回水程度的增加，Jr逐渐减小到零。建立了一个方程来估计回流区90°弯道水流的横向斜率。

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来源期刊

Water science and engineering WATER RESOURCES-

CiteScore

6.60

自引率

5.00%

发文量

573

审稿时长

50 weeks

期刊介绍： Water Science and Engineering journal is an international, peer-reviewed research publication covering new concepts, theories, methods, and techniques related to water issues. The journal aims to publish research that helps advance the theoretical and practical understanding of water resources, aquatic environment, aquatic ecology, and water engineering, with emphases placed on the innovation and applicability of science and technology in large-scale hydropower project construction, large river and lake regulation, inter-basin water transfer, hydroelectric energy development, ecological restoration, the development of new materials, and sustainable utilization of water resources.