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Water and Eenrgy International
Year : 1996, Volume : 53, Issue : 1
First page : ( 19) Last page : ( 25)
Print ISSN : 0974-4207. Online ISSN : 0974-4711.

Effect of shape and arrangement of roughness elements on the free discharge below vertical sluice gates

Negm A.M.*Assistant Professors, El-sayed A.H.*Assistant Professors, Mohamed Mahmoud Abdellateef**Associate Professor, Owais Talaat Mohamed*Professor of Civil Engineering

*Water Structures Enginuring Department Faculty of Engineering, Zagazig University, Zagazig, Egypt

**Irrigation and Hydraulics Department Faculty of Engineering, Ain Shams University, Cairo, Egypt

Abstract

This paper presents the results of an experlmental lnvestlgatlon on the discharge characteristics of a sluice gate under the effect of different artificial roughened channel beds constructed downstream. Taking the discharge coefficient as the main criterion, we conducted a series of experiments using different shapes of artificial roughness elements (rectangular, hexagonal and cylindrical) fixed In strips as well as staggered forms with a variety of concentrations under a wide range of gate openings and flow condltions. The results were compared with those of other studies involving similar roughness patterns at comparable conditions. Finally, a method is proposed to compute the discharge coefficient for the flow under a sluice gate with roughened bed downstream by considerlng the shape and concentration

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