Laboratory Investigation on Discharge Coefficient of Trapezoidal Piano Key Side Weirs

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Seyed Javad M.S.; Omid Naeini S.T.; SANEI M.

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Journal: Irrigation and Drainage Structures Engineering Research Year:2020 | Volume:21 | Issue:78 Page(s): 23-40

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Title

Laboratory Investigation on Discharge Coefficient of Trapezoidal Piano Key Side Weirs

Author(s)

Seyed Javad M.S. | Omid Naeini S.T. | SANEI M. | Issue Writer Certificate

Keywords

DischargeQ1

flowQ1

water diversion structureQ1

Abstract

Introduction: The flow passing through a side weir, one of the varieties of water diversion structures, is a variable flow with decreasing flow rate. Labyrinth weir is the basis for piano key weirs. They are often constructed with vertical walls and are much more efficient than the linear weirs. Nevertheless, the flow, especially the bottom flow, enters this type of weirs and passes through two vertical walls of the side crests. Then it becomes squeezed and therefore the upstream and downstream crests come up with inappropriate hydraulic behavior. Also, the most outstanding disadvantage of this type of weirs is the large foundation area needed to be constructed on the concrete dams. The piano key weirs are a modern type of the nonlinear weirs which have been developed by Hydro Coop Institute of France and the Hydraulic and Environmental laboratory of the Biskara University of Algeria. In general, these weirs comprise of 4 different types, the differences of which lie in the presence or the absence of slopes created for them. Type A is sloped both upstream and downstream, Type B is sloped upstream, Type C is sloped downstream and Type D lacks any slope. The present study conducted show the effective geometrical parameters on the hydraulic performance and Discharge coefficient (CM) of the trapezoidal piano key side weirs (TPKSW). The type of flow and its variations in a side weir can be considered as the C_M of the side weir, using simplifications and assumptions suggested by De-Marchi in 1934 to obtain suitable equivalents for side weirs...

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APA: Copy

Seyed Javad, M.S., Omid Naeini, S.T., & SANEI, M.. (2020). Laboratory Investigation on Discharge Coefficient of Trapezoidal Piano Key Side Weirs. IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH , 21(78 ), 23-40. SID. https://sid.ir/paper/367584/en

Vancouver: Copy

Seyed Javad M.S., Omid Naeini S.T., SANEI M.. Laboratory Investigation on Discharge Coefficient of Trapezoidal Piano Key Side Weirs. IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH [Internet]. 2020;21(78 ):23-40. Available from: https://sid.ir/paper/367584/en

IEEE: Copy

M.S. Seyed Javad, S.T. Omid Naeini, and M. SANEI, “Laboratory Investigation on Discharge Coefficient of Trapezoidal Piano Key Side Weirs,” IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH , vol. 21, no. 78 , pp. 23–40, 2020, [Online]. Available: https://sid.ir/paper/367584/en

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