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


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.


Gradual channel transition Flow pattern Experimental study Numerical simulation 


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  1. Afzalimehr H, Anctil FO (2000) Accelerating shear velocity in gravel-bed channels. Hydrological Sciences-Journal-des Sciences. Hydrologiques 45 (1): 113–124. DOI: 10.1080/026 26660009492309CrossRefGoogle Scholar
  2. Armellini A, Casarsal L, Giannattasio P (2009) Separated flow structures around a cylindrical obstacle in a narrow channel. Experimental Thermal and Fluid. Science 33(4): 604–619. DOI: 10.1016/j.expthermflusci.2008.12.005Google Scholar
  3. Barbhuiya AK, Talukdar S (2010) Scour and three dimensional turbulent flow fields measured by ADV at a 90° horizontal forced bend in a rectangular channel. Flow Measurement and. Instrumentation 21: 312–321. DOI: 10.1016/j.flowmeasinst. 2010.04.002Google Scholar
  4. Blanckaert K, Vriend de HJ (2005) Turbulence characteristics in sharp open-channel bends. Physics of. Fluids 17 (5): 055102. DOI: 10.1063/1886726CrossRefGoogle Scholar
  5. Graber SD (2006) Asymmetric flow in symmetric supercritical expansions. Journal of Hydraulic Engineering ASCE 132(2):207–213. DOI: 10.1061/(ASCE)0733-9429(2006)132:2(207)CrossRefGoogle Scholar
  6. Hoan NT, Booij R, Stive MJF, et al. (2007) Deceleration openchannel flow in gradual expansion. The Fourth International Conference on Asian and Pacific Coasts (APAC), Nanjing, China. China Ocean Press. pp 902-915.Google Scholar
  7. Leutheusser HJ, Fan JJ (2001) Backward flow velocities of submerged hydraulic jumps. Journal of Hydraulic Engineering. ASCE 127(6): 514–517. DOI: 10.1061/(ASCE)0733-9429(2001)127:6(514)Google Scholar
  8. Lin C, Hsieh SC, Lin IJ, et al. (2012) Flow property and selfsimilarity in steady hydraulic jumps. Experiments in. Fluids 53: 1591–1616. DOI: 10.1007/s00348-012-1377-2Google Scholar
  9. Liu MN, Rajaratnam N, Zhu DZ (2004) Turbulence structure of hydraulic jumps of low Froude numbers. Journal of Hydraulic Engineering ASCE 130(6):511–520. DOI: 10.1061/(ASCE)0733-9429(2004)130:6(511)CrossRefGoogle Scholar
  10. Lucy C, Quine TA and Nicholas A (2010) An experimental investigation of autogenic behavior during alluvial fan evolution. Geomorphology 115(3/4): 278–285. DOI: 10.1016/j.geomorph.2009.06.033Google Scholar
  11. Misra SK, Kirby JT, Brocchini M, et al. (2008) The mean and turbulent flow structure of a weak hydraulic jump. Physics of. Fluids 20: 035106. DOI: 10.1063/1.2856269.CrossRefGoogle Scholar
  12. Molls T, Chaudhry MH (1995) Depth-averaged open-channel flow model. Journal of Hydraulic. Engineering 121(6): 453–465.Google Scholar
  13. Nezu I, Nakagawa H (1993) Turbulence in open-channel flows. IAHR, Rotterdam, Netherlands: A.A.Balkema Publishers. pp 53–54.Google Scholar
  14. Paiement-Paradis G, Marquis G, Roy A (2011) Effects of turbulence on the transport of individual particles as bedload in a gravel-bed river. Earth surface processes and. landforms 36(1): 107–116. DOI: 10.1002/esp.2027CrossRefGoogle Scholar
  15. Papanicolaou AN, Hilldale R (2002) Turbulence characteristics in gradual channel transition. Journal of Engineering. Mechanics 128: 948–960. DOI: 10.1061/(ASCE)0733-9399(2002)128:9(948)Google Scholar
  16. Singha A, Balachandar R (2011) Structure of wake of a sharpedged bluff body in a shallow channel flow. Journal of Fluids and. Structures 27(2): 233–249. DOI: 10.1016/j.jfluidstructs. 2010.11.001Google Scholar
  17. Thompson JF, Warsi ZUA, Mastin CW (1985) Numerical grid generation: foundations and applications. Elsevier North-Holland, Inc. New York, NY, USA. pp 141–142.Google Scholar
  18. Wang XY, Yang QY, Lu WZ, et al. (2011) Experimental study of near-wall turbulent characteristics in an open-channel with gravel bed using an acoustic Doppler velocimeter. Experiment in. Fluids 52: 85–94. DOI: 10.1007/s00348-011-1202-3Google Scholar
  19. Weber LJ, Eric DS, Nicola M (2001) Experiments on flow at a 90° open-channel junction. Journal of Hydraulic Engineering. ASCE 127(5): 340–350. DOI: 10.1061/(ASCE)0733-9429(2001)127:5(340)Google Scholar
  20. Wu S and Rajaratnam N (1996) Transition from hydraulic jump to open channel flow. Journal of Hydraulic Engineering. ASCE 122(9): 526–528. DOI: 10.1061/(ASCE)0733-9429(1996)122:9(526)Google Scholar
  21. Wu CG (2008) Hydraulics. Higher Education Press, Beijing, China. pp 285–287. (In Chinese)Google Scholar
  22. Yan XF, Yi ZJ, Liu TH, et al. (2011) Flow structure and characteristics of local head loss in transition channel. Journal of Yangtze River Scientific Research. Institute 28(9): 1–5. (In Chinese)Google Scholar
  23. Yang QY, Lu WZ, Zhou SF, et al. (2014) Impact of dissipation and dispersion terms on simulations of open-channel confluence flow using two-dimensional depth-averaged model. Hydrological. Processes 28: 3230–3240. DOI: 10.1002/hyp. 9881Google Scholar
  24. Yang QY, Wang XY, Lu WZ, et al. (2009) Experimental study on characteristics of separation zone in confluence zones in rivers. Journal of Hydrologic Engineering. ASCE 14(2): 166–171. DOI: 10.1061/(ASCE)1084-0699(2009)14:2(166).Google Scholar

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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