The S-jump’s Characteristics in the Rough Sudden Expanding Stilling Basin

Document Type : Research Article

Authors

1 Associate Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran.

2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran.

3 M.Sc. Student, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, East Azerbaijan, Iran

4 Ph.D. Student, Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran.

Abstract

One way to dissipate energy is to use sudden expansion stilling basin structures downstream of spillway, gates and chute. The present study is aimed to study influences of shear stress caused by a rough bed on S-jump’s characteristics in an expanding stilling basin. Experiments were performed in a horizontal laboratory flume with a rectangular cross-section, a Plexiglas wall and floor with an expanding ratio of 0.33, a Froude number range of 5.38 to 10.78. The results showed that the shear stress of the rough bed in the expanded stilling basin was more than 13.5 times the shear stress of the prismatic stilling basin with a smooth bed. Secondary depth and the length of the s-jump on the rough bed have reduced to 20% and 16%, respectively. Also S- jump with rough beds reduces the secondary depth by about 58.5% compared to classical hydraulic jump. Increased shear stress has a marginal impact on jump efficiency, so that the effect of expanding on jump efficiency is greater than the effect of increased shear stress. Expanding stilling basins with a smooth and rough bed are moderate compared to prismatic basin. It can and increase the jump efficiency for smooth and rough bed by 23.5 and 28.7%, respectively.

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Main Subjects

References

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AUT Journal of Civil Engineering
Volume 4, Issue 3
September 2020
Pages 349-356

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