Effect of Roughness at Downstream of Ogee Spillway in Order to Hydraulic Jump Control

Daneshfaraz, Rasoul; Sadeghfam, Sina; Saei, Vahid

doi:10.22092/idser.2018.114595.1235

Document Type : Original Article

Authors

¹ Civil Eng. Depertment, Unv. of Maragheh

² Assistant Professor, university of Maragheh, Faculty of Engineering.

³ Msc, water civil engineering, Maragheh branch, Islamic azad university, Maragheh, iran.

https://doi.org/10.22092/idser.2018.114595.1235

Abstract

In this study, the roughness at downstream of ogee spillway has been simulated numerically for different flows, and the effects of roughness on the transformation of flow regime, the water surface profiles, and the energy losses also have been investigated. Hence, after solution domain generation, meshing, and specification of boundary conditions, the numerical simulation has been run by using k-e standard turbulence model, and in order to validation of the numerical results of the investigated ogee spillway, the experimental model of ogee spillway proposed by Chatila and Tabara (2004) has been used. Also, the effects of three types of roughness at downstream of this spillway were evaluated. The results indicated that by increasing the heigh of roughness, the energy loss increases up to 80 percent. The roughness types of 3 and 4, imposed the regime transformation and caused 70 to 50 percent, in average, energy losses respectively. Also, we found that increase in flow discharge affected directly the water surface profiles. Results showed that if the design of stilling basin was considered, the roughness with a height of 0.6Hd had the ability of flow regime transformation and was evaluated as the most successful design.

Keywords

References

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Irrigation and Drainage Structures Engineering Research

Effect of Roughness at Downstream of Ogee Spillway in Order to Hydraulic Jump Control

References

References

Volume 20, Issue 74 - Serial Number 74
March 2019
Pages 27-40

Effect of Roughness at Downstream of Ogee Spillway in Order to Hydraulic Jump Control

References

References

Volume 20, Issue 74 - Serial Number 74March 2019Pages 27-40

Volume 20, Issue 74 - Serial Number 74
March 2019
Pages 27-40