Experimental Analysis of Hydraulic Behavior of Flow through Sluice Gates with Variable Openings

Öz

One of the most commonly used control structures is the sluice gate, which is typically employed as a vertical plate installed within the flow path of open channels. The present study aims to investigate the effect of the gate opening ratio on the hydraulic characteristics of the flow. The results indicate that the maximum value of the contraction coefficient corresponds to the smallest gate opening. Furthermore, for all opening conditions, the contraction coefficient decreases with increasing upstream water depth. The findings also reveal an inverse relationship between the gate opening and the discharge coefficient, such that a reduction in gate opening leads to an increase in the discharge coefficient. On average, the discharge coefficient for a gate opening of 1 cm is approximately 7.75%, 16.51%, and 18.35% higher than those corresponding to openings of 2, 4, and 5 cm, respectively. Analysis of the results further shows that, for a constant discharge, increasing the gate opening results in reduced energy dissipation between the upstream and downstream sections of the hydraulic jump. Moreover, as the Froude number downstream of the gate identified as the most influential dimensionless parameter governing energy dissipation increases, the relative energy loss also increases. In this study, the Froude number ranges from 2.2 to 14.2, exerting a direct influence on the length of the hydraulic jump, which decreases with increasing gate opening. Additionally, the gate opening exhibits an inverse relationship with both the upstream water depth and the magnitude of the hydrodynamic force acting on the gate. Based on dimensionless parameters, nonlinear polynomial regression relationships were developed using experimental data to predict the relative energy loss and the discharge coefficient of the sluice gate. These relationships demonstrate satisfactory performance according to statistical evaluation indices and can be applied with a high degree of confidence.

Anahtar Kelimeler

• Discharge coefficient
• Energy dissipation
• hydraulic jump
• Regression equation

Kaynakça

1. [1] Henry, H. R. 1950. Discussion on "Diffusion of submerged jets, "by Albertson, M. L. et al., Trans. Am. Society Civil Engrs, 115, 687.
2. [2] Rajaratnam, N. and Subramanya, K. 1967. Flow Equation for the Sluice Gate. Journal of the Irrigation and Drainage Division, 93(3): 167-186.
3. [3] Rajaratnam, N. 1977. Free Flow Immediately Below Sluice Gates: Journal of the Hydraulics Division, 103(4): 345-351.
4. [4] Swamee, P. K. 1992. Sluice Gate Discharge Equations. Journal of Irrigation and Drainage Engineering, 118(1): 56-60.
5. [5] Shivapur, A. V. and Shesha Prakash, M. N. 2005. Inclined Sluice Gate for Flow Measurement. ISH Journal of Hydraulic Engineering, 11 (1): 46-56.
6. [6] Nasehi Oskuyi N, Salmasi F, (2012). Vertical Sluice Gate Discharge Coefficient, Journal of Civil Engineering and Urbanism, 2(3): 108-114.
7. [7] Golmohammadi, M.H. and Beyrami, M.K. (2011). Estimation of Discharge For Free Flow Under Sluice and Radial Gates, Journal of Water & Wastewater, 22(78), 94-101.
8. [8] Khalili Shayan. H. and Farhoudi, J. (2013). Effective parameters for calculating discharge coefficient of sluice gates: Flow Measurement and Instrumentation, 33, 96-105.

9. [9] Mohammed A, Moayed K, (2013). Gate Lip Hydraulics under Sluice gate. Modern Instrumentation. 2(1): 16-19. Doi: 10.4236/mi.2013.21003.
10. [10] Daneshfaraz R, Ghahramanzadeh A, Ghaderi A, Joudi AR, Abraham J, (2016). Investigation of the Effect of Edge Shape on Characteristics of Flow under Vertical Gates. Journal of American Water Works Association, Doi.org/10.5942/jawwa.2016.108.0102
11. [11] Ashkan F, Daneshfaraz R, ghaffarinik A, Gahramanzadeh A, Minaei O, (2019). Numerical Investigation of the Successive Sluice Gates Performance in Regulating Flow Rate through Channels Using Flow-3D Software. Water and Soil Science, 29(4): 85-96.
12. [12] Salmasi, F., Nouri, M., Sihag, P. and Abraham, J. 2021. Application of SVM, ANN, GRNN, RF, GP and RT Models For Predicting Discharge Coefficients of Oblique Sluice Gates Using Experimental Data. Water Supply, 21 (1): 232-248.
13. [13] Bijankhan, M. and Kouchakzadeh, S. (2014). Free Hydraulic Jump Due to Parallel Jets. Journal of Irrigation and Drainage Engineering ASCE 141(2). Doi:10.1061/(ASCE)IR.1943-4774.0000797
14. [14] Abbaszadeh, H., Daneshfaraz, R., Sume, V., & Abraham, J. (2024). Experimental investigation and application of soft computing models for predicting flow energy loss in arc-shaped constrictions. AQUA—Water Infrastructure, Ecosystems and Society, 73(3), 637-661.
15. [15] Daneshfaraz, R., Norouzi, R., Abbaszadeh, H., & Azamathulla, H. M. (2022). Theoretical and experimental analysis of applicability of sill with different widths on the gate discharge coefficients. Water Supply, 22(10), 7767-7781.
16. [16] Daneshfaraz, R., Norouzi, R., Abbaszadeh, H., Kuriqi, A., & Di Francesco, S. (2022). Influence of sill on the hydraulic regime in sluice gates: an experimental and numerical analysis. Fluids, 7(7), 244.
17. [17] Abbaszadeh, H., Norouzi, R., Sume, V., Kuriqi, A., Daneshfaraz, R., & Abraham, J. (2023). Sill role effect on the flow characteristics (experimental and regression model analytical). Fluids, 8(8), 235.
18. [18] Hassanzadeh, Y., & Abbaszadeh, H. (2023). Investigating discharge coefficient of slide gate-sill combination using expert soft computing models. Journal of Hydraulic Structures, 9(1), 63-80.
19. [19] Süme, V., Daneshfaraz, R., Kerim, A., Abbaszadeh, H., & Abraham, J. (2024). Investigation of clean energy production in drinking water networks. Water Resources Management, 38(6), 2189-2208.
20. [20] Daneshfaraz, R., Abbaszadeh, H., Gorbanvatan, P., & Abdi, M. (2021). Application of Sluice Gate in Different Positions and Its Effect on Hydraulic Parameters in Free-Flow Conditions. Journal of Hydraulic Structures, 7(3).
21. [21] Hassanzadeh, Y., Abbaszadeh, H., Abedi, A., & Abraham, J. (2024). Numerical simulation of the effect of downstream material on scouring-sediment profile of combined spillway-gate. AQUA—Water Infrastructure, Ecosystems and Society, 73(12), 2322-2343.
22. [22] Abbaszadeh, H., Daneshfaraz, R., & Norouzi, R. (2023). Experimental investigation of hydraulic jump parameters in sill application mode with various synthesis. Journal of Hydraulic Structures, 9(1), 18-42.
23. [23] Daneshfaraz, R., Norouzi, R., & Abbaszadeh, H. (2021). Numerical investigation on effective parameters on hydraulic flows in chimney proportional weirs. Iranian Journal of Soil and Water Research, 52(6), 1599-1616.
24. [24] Roushangar, K., Goodarzi, S., & Abbaszadeh, H. (2024). Numerical investigation of the performance of blade groynes on scouring and its effect on hydraulic parameters of sediment and flow. Environmental Water Engineering, 10(1), 121-136.
25. [25] Abbaszadeh, H., Norouzi, R., Süme, V., Daneshfaraz, R., & Tarinejad, R. (2023). Discharge coefficient of combined rectangular-triangular weirs using soft computing models. Journal of Hydraulic Structures (JHS), 9(1).
26. [26] Abbaszadeh, H., & Tarinejad, R. (2025). Soft Computing and Predicting Labyrinth Gates Discharge Coefficient. Water Resources, 52(4), 701-714.
27. [27] Abbaszadeh, H., Roushangar, K., Daneshfaraz, R., & Abraham, J. (2025). Simulation of flow features in the face of tainter and sluice gate flow measurement structures. Numerical Methods in Civil Engineering, 10(2), 45-60.
28. [28] Abbaszadeh, H. R., Hassanzadeh, Y., Daneshfaraz, R., & Norouzi, R. (2025). Application of intelligence models based on soft computing in investigating the discharge coefficient of the sluice gate under free-flow condition and symmetrical sill with the help of KNN, ANN, GEP and SVM models. Sharif Journal of Civil Engineering, 40(4), 3-12.
29. [29] Abbaszadeh, H., & Tarinejad, R. (2024). Investigating the Rate of Flow Energy Loss in Zigzag Weirs Using Methods Based on Soft Computing. Journal of Civil and Environmental Engineering, 54(116), 53-64.
30. [30] Tabrizchi, M., Hassanzadeh, Y., Aalami, M. T., & Abbaszadeh, H. (2025). Investigation of Flow Parameters in a Chute Spillway Using FLOW-3D Software. Iranian Journal of Soil and Water Research, 56(2), 411-431.
31. [31] Hager, W. H. (1999). Underflow of Standard Sluice Gate. Experiments in Fluids, 27(4), 339-350. Doi:10.1007/s003480050358.