TY - JOUR
T1 - Turbulent velocity distribution with dip phenomenon in conic open channels
AU - Guo, Junke
AU - Mohebbi, Amin
AU - Zhai, Yuan
AU - Clark, Shawn P.
N1 - Funding Information:
ISSN 0022-1686 print/ISSN 1814-2079 online http://www.tandfonline.com This material is published by permission of the J. Sterling Jones Hydraulics Research Laboratory, operated by the Turner-Fairbank Highway Research Center for the US Department of Transportation under Contract No. DTFH61-11-D-00010. The US Government retains for itself, and others acting on its behalf, a paid-up, non-exclusive, and irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government. 73
Publisher Copyright:
© 2014 International Association for Hydro-Environment Engineering and Research.
PY - 2015/1/2
Y1 - 2015/1/2
N2 - Conic open-channel flow as occurs in sub-drains, sewers, and culverts is computed by Manning's or Darcy's resistance equations for the cross-sectional average velocity only. Yet, fish passage culvert design requires the cross-sectional velocity distribution, which is proposed in this paper based on two hypotheses: (i) centreline velocity distribution follows the conventional log-law with a cubic deduction near the water surface; (ii) cross-sectional velocity distribution is described by Guo and Julien's modified log-wake-law but neglecting the squared sine function. These hypotheses result in a novel and simple velocity distribution model without any fitting parameter. Its graphical interpretation for the elliptic, parabolic, and hyperbolic channels indicates reasonable velocity contours with dip phenomenon. Further, it agrees well with circular pipe data related to the average shear velocity, velocity-dip position, centreline and cross-sectional velocity distributions. A potential application includes fish passage culvert design by specifying a low velocity zone near the wall.
AB - Conic open-channel flow as occurs in sub-drains, sewers, and culverts is computed by Manning's or Darcy's resistance equations for the cross-sectional average velocity only. Yet, fish passage culvert design requires the cross-sectional velocity distribution, which is proposed in this paper based on two hypotheses: (i) centreline velocity distribution follows the conventional log-law with a cubic deduction near the water surface; (ii) cross-sectional velocity distribution is described by Guo and Julien's modified log-wake-law but neglecting the squared sine function. These hypotheses result in a novel and simple velocity distribution model without any fitting parameter. Its graphical interpretation for the elliptic, parabolic, and hyperbolic channels indicates reasonable velocity contours with dip phenomenon. Further, it agrees well with circular pipe data related to the average shear velocity, velocity-dip position, centreline and cross-sectional velocity distributions. A potential application includes fish passage culvert design by specifying a low velocity zone near the wall.
KW - Conic section
KW - culvert flow
KW - fish passage
KW - open channel
KW - partially-filled pipe
KW - velocity distribution
KW - velocity-dip phenomenon
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U2 - 10.1080/00221686.2014.928807
DO - 10.1080/00221686.2014.928807
M3 - Article
AN - SCOPUS:84925818178
SN - 0022-1686
VL - 53
SP - 73
EP - 82
JO - Journal of Hydraulic Research/De Recherches Hydrauliques
JF - Journal of Hydraulic Research/De Recherches Hydrauliques
IS - 1
ER -