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CLC number: TV131

On-line Access: 2012-07-03

Received: 2012-02-02

Revision Accepted: 2012-05-28

Crosschecked: 2012-06-18

Cited: 1

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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.7 P.519-525

http://doi.org/10.1631/jzus.A1200037


Hydraulic jump basins with wedge-shaped baffles


Author(s):  Ashraf Fathy Ellayn, Zhi-lin Sun

Affiliation(s):  Institute of Port, Coastal and Offshore Engineering, Zhejiang University, Hangzhou 310058, China

Corresponding email(s):   ashraf@zju.edu.cn, oceansun@zju.edu.cn

Key Words:  Energy dissipater, Hydraulic jump, Stilling basins, Wedge-shaped bed roughness


Ashraf Fathy Ellayn, Zhi-lin Sun. Hydraulic jump basins with wedge-shaped baffles[J]. Journal of Zhejiang University Science A, 2012, 13(7): 519-525.

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Abstract: 
This laboratory study deals with the hydraulic jump properties for an artificially roughened bed with wedge-shaped baffle blocks. The experiments were conducted for both smooth and rough beds with a Froude number in the range of 3.06≤F1≤10.95 and a relative bed roughness ranging 0.22≤KR≤1.4. The data from this study were compared with those of rectangular baffle blocks. New experimental formulae were developed for determining the sequent depth ratio and the hydraulic jump length in terms of the inflow Froude number and relative bed roughness. Bélanger’s jump equation of a rectangular channel was extended to account for the implications of the bed shear stress coefficient attributable to channel bed roughness. It was found that, in comparison with the smooth bed, the wedge-shaped bed roughness reduced the sequent depth of the hydraulic jump by approximately 16.5% to 30% and the hydraulic jump length by approximately 30% to 53%.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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