Discharge Computation of Trapezoidal Broad-Crested Side Weir in Subcritical Flow Regime using Spatially Varied Flow Theory

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VELAYATI F.; VATANKHAH A.R.

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Paper Information

Journal: Irrigation and Drainage Structures Engineering Research Year:2019 | Volume:20 | Issue:74 Page(s): 1-12

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Title

Discharge Computation of Trapezoidal Broad-Crested Side Weir in Subcritical Flow Regime using Spatially Varied Flow Theory

Author(s)

VELAYATI F. | VATANKHAH A.R. | Issue Writer Certificate

Keywords

Flow AnalysisQ1

Flow MeasurementQ1

Fourth Order Runge-Kutta MethodQ1

Laboratory StudyQ2

Water Surface ProfileQ3

Abstract

Flow over side weirs has been the subject of many studies. Most of these studies related to sharp crested side weirs with rectangular cross sections and less attention has been given to the discharge coefficient over the broad-crested side weirs with trapezoidal cross section. In this research, a comprehensive Laboratory Study including 187 tests has been conducted to investigate the discharge coefficient over the broad-crested trapezoidal side weir under subcritical flow regime. In this research, Water Surface Profile along the side weir was computed by using the Fourth Order Runge-Kutta Method, because dynamic equation, governing side weirs, lacked complete analytical solution due to its nonlinearity quality and possessing many variables involved. By analyzing experimental data and using dimensional analysis as well as statistical analysis, some relationships were proposed to estimate the discharge coefficient. The results suggest that the discharge coefficient of flow depends on the Froude number, the ratio of initial depth to crest width, and the side slope of the weir. The mean absolute percentage error of proposed relationship, about 4%, indicated that the numerical method was very accurate.

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APA: Copy

VELAYATI, F., & VATANKHAH, A.R.. (2019). Discharge Computation of Trapezoidal Broad-Crested Side Weir in Subcritical Flow Regime using Spatially Varied Flow Theory. IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH , 20(74 ), 1-12. SID. https://sid.ir/paper/406746/en

Vancouver: Copy

VELAYATI F., VATANKHAH A.R.. Discharge Computation of Trapezoidal Broad-Crested Side Weir in Subcritical Flow Regime using Spatially Varied Flow Theory. IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH [Internet]. 2019;20(74 ):1-12. Available from: https://sid.ir/paper/406746/en

IEEE: Copy

F. VELAYATI, and A.R. VATANKHAH, “Discharge Computation of Trapezoidal Broad-Crested Side Weir in Subcritical Flow Regime using Spatially Varied Flow Theory,” IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH , vol. 20, no. 74 , pp. 1–12, 2019, [Online]. Available: https://sid.ir/paper/406746/en

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