Calibration of unsteady flow in Crump Weir

Document Type : Research Article

Authors

1 Department of Civil Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

2 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

Abstract

Crump weir is widely used to measure flow rate in open channels. In this study, flow rate calibration is experimentally investigated for an unsteady free flow. To consider the effect of flow rate on flow coefficient, increasing and decreasing flow rate regimes were considered. Experimental tests were performed in a laboratory flume equipped with real-time data acquisition and recording system. The behavior of the flow rate coefficient was investigated as a function of three dimensionless parameters containing weir height to the upstream water height ratio, the weir length to upstream water height ratio, and the weir width to upstream water height ratio. Results show that the flow rate coefficient is in reverse correspondence with all dimensionless parameters so that with an increase in each of these parameters, the flow rate coefficient decreases. Finally using genetic algorithm, the optimization of the flow rate coefficient was performed. It was shown that the calibrated flow rate coefficient lies between 0.4 and 0.7.

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References

[1] M.G. Bos, Discharge measurement structures, ILRI (Int. Institute for land Reclamation), Netherlands, 1978.
[2] H.E. Bazin, Experiences nouvelles sur l'ecoulement en deversoir: executees a Dijon de 1886 a 1895, Gyan Books Pvt. Ltd, Delhi, India, 2017.
[3] R.E. Horton, Weir experiments, coefficients, and formulas, USGS, Washington, USA, 1907.
[4] S. Haun, N.R.B. Olsen, R. Feurich, Numerical Modeling of Flow Over Trapezoidal Broad-Crested Weir, Engineering Applications of Computational Fluid Mechanics, 5(3) (2011) 397-405.
[5] E. Sargison Jane, A. Percy, Hydraulics of Broad-Crested Weirs with Varying Side Slopes, Journal of Irrigation and Drainage Engineering, 135(1) (2009) 115-118.
[6] H. Azimi Amir, N. Rajaratnam, Z. Zhu David, Submerged Flows over Rectangular Weirs of Finite Crest Length, Journal of Irrigation and Drainage Engineering, 140(5) (2014) 06014001.
[7] O. Bilhan, M.E. Emiroglu, O. Kisi, Use of artificial neural networks for prediction of discharge coefficient of triangular labyrinth side weir in curved channels, Advances in Engineering Software, 42(4) (2011) 208-214.
[8] M. Rezaee, A. Emadi, Q. Aqajani Mazandarani, Experimental Study of Rectangular Labyrinth Weir, Water and Soil, 29(6) (2016) 1438-1446.
[9] B.M.A. Noori, N.T. Aaref, Hydraulic Performance of Circular Crested Triangular Plan Form Weirs, Arabian Journal for Science and Engineering, 42(9) (2017) 4023-4032.
[10] S. Yakubu Khalifa, B. Korode Adeogun, A. Ismail, M. Ajibola Ajibike, M. Mujahid Muhammad, Performance Evaluation of Flow over Crump Weir Using Data-Driven Models, ATBU Journal of Science, Technology and Education, 9(4) (2022) 115-130.
[11] M. Yasi, N. Salamat Ravandi, Numerical Simulation of Flow over Sharp- and Broad-Crested Weirs with Horizontal and Sloping Crests in a Channel Bend, Journal of Iranian Water Engineering Research, 2(1) (2022) 51-65. In Persian
[12] E.C. Bortoni, M.S. Rocha, M.A.S. Rodrigues, B.C.S. Laurindo, Calibration of weirs using unsteady flow, Flow Measurement and Instrumentation, 57(October 2017) (2017) 73-77.
[13] A. Arafi, E. Izadinia, A. Khoshfetrat, Evaluation of the Discharge Coefficient of Piano Key Weir under the Unsteady - Gradual Varied Flow with Increasing Discharge, Journal of Hydraulics, 18(1) (2023) 127-142.In Persian.
Amirkabir Journal of Civil Engineering
Volume 55, Issue 11
February 2024
Pages 2327-2342

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