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Effect of Bed Roughness on Submerged Hydraulic Jumps

Authors:

Y. Dilrooban ,

University of Peradeniya, LK
About Y.
B.Sc Eng. (Hons) (Peradeniya),  Faculty of Engineering
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K. Imasalan,

University of Peradeniya, LK
About K.
Eng.,B.Sc Eng. (Hons) (Peradeniya),
Faculty of Engineering, University of Peradeniya, Sri Lanka.
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K. Sujana,

University of Peradeniya, LK
About K.
Eng. B.Sc Eng. (Hons) (Peradeniya),
Faculty of Engineering
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K. P. P. Pathirana

University of Peradeniya, LK
About K. P. P.
Eng.(Prof.)  B.Sc. Eng. (Hons.)(Peradeniya), M.Eng., Ph.D. (KULeuven), C.Eng., FIE(Sri Lanka), MICE(London). Int.PE(SL),
Professor of Civil Engineering, Department of Civil Engineering
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Abstract

Free and submerged hydraulic jumps are important phenomena in open channel flow. The basic characteristics of these jumps formed on smooth, horizontal channel beds were covered well in literature both experimentally and theoretically. However, not many studies are reported on submerged hydraulic jumps generated on rough beds. This study mainly aims to investigate the characteristics of submerged hydraulic jumps over rough, horizontal beds. But, as the submerged hydraulic jumps are created from free jumps, analyses of free jumps are also required to proceed with the present study. So, altogether 110 experimental runs were carried out under both smooth and rough bed conditions. All the experiments were carried out in a rectangular flume and for the rough bed condition. Bed of the flume was roughened by placing rectangular wooden strips at four different spacing. The hydraulic parameters such as initial water depths, subcritical sequent depth, tail water depth, back-up depth and flow rates were measured for different roughness. Using these available data, required data analyses were carried out and several relationships were developed in order to express the submerged hydraulic jump characteristics. Here, free and submerged hydraulic jumps were considered separately.


ENGINEER, Vol. 47, No. 04, pp. 33-39, 2014
DOI: http://doi.org/10.4038/engineer.v47i4.6875
How to Cite: Dilrooban, Y. et al., (2014). Effect of Bed Roughness on Submerged Hydraulic Jumps. Engineer: Journal of the Institution of Engineers, Sri Lanka. 47(4), pp.33–39. DOI: http://doi.org/10.4038/engineer.v47i4.6875
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Published on 27 Oct 2014.
Peer Reviewed

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