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Journal of Mountain Science

, Volume 13, Issue 2, pp 361–368 | Cite as

Effects of river width changes on flow characteristics based on flume experiment

  • Xie-kang WangEmail author
  • Bing-jie Wang
  • Xing-nian Liu
  • Li-qiong Zhang
Article
  • 128 Downloads

Abstract

The rapid changes in flow pattern due to varying channel widths will make significantly impact on the hydraulic structures and evolutions of open channel. To better understand the impact of varying width, a flume experiment with adjustable width and a depth-averaged two-dimension numerical model were used to analyze the variations of flow parameters. Our experimental results showed that flow velocity gradually increased with decreasing water depth in converging region, and decreased with increasing water depth in diverging zones. It was also found that the turbulence intensity laws in three directions were not agreed with the theoretical relationships proposed by Nezu and Nakagawa in 1993 in straight open channel flows. The flow in the channel with varying width may change from the supercritical flow to the subcritical flow as a function of Froude number. Our numerical simulations with different flow rates showed that most of the hydraulic jumps in diverging region were submerged jump and the degree of submergence increased with increasing flow rate in gradual channel transition. When the flow rate increased, the range of supercritical flow rapidly decreased and the flow changed from the supercritical condition to the subcritical condition in diverging sections.

Keywords

Gradual channel transition Flow pattern Experimental study Numerical simulation 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Xie-kang Wang
    • 1
    Email author
  • Bing-jie Wang
    • 1
  • Xing-nian Liu
    • 1
  • Li-qiong Zhang
    • 2
  1. 1.State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengduChina
  2. 2.Hydrology and Hydraulics SectionSouth Florida Water Management DistrictWest Palm BeachUSA

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