Laboratory investigation of the Effect of a Submerged Jet in a Wavy Bed with a Gradually Diverging Cross-section on the Characteristics of Asymmetric Hydraulic Jump

Document Type : Original Research

Authors
J. Ahadiyan 1
M. Hakami 2
M. Shafaei Bajestan 3
S. M. Sahadi 4
1 Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 Ph.D. student of Hydraulic Structures, Water and Environmental Engineering Faculty, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3 Professor of Hydraulic Structures, Water and Environmental Engineering Faculty, Shahid Chamran University of Ahvaz, Ahvaz, Iran
4 Assistant Professor of Hydraulic Structures, Water and Environmental Engineering Faculty, Shahid Chamran University of Ahvaz, Ahvaz, Iran
10.22034/24.1.151
Abstract
One of the most famous hydraulic phenomena to reduce flow energy is hydraulic jump, which is used downstream of dam overflows in river sections and structures established in irrigation and drainage canals. It is very important to control and reduce the kinetic energy resulting from this phenomenon at smaller distances from the place of formation. Among the examples of depreciation structures, we can mention the roughness of the bed and the construction of stilling basin and making expansion, but it must be said that it causes pressure fluctuations and damage to the bed of the canals and river. The existence of the submerged jet can reduce this pressure fluctuation and change the flow downstream to subcritical. The purpose of this research was to investigate the presence of a submerged jet system on the characteristic of asymmetric hydraulic jump in corrugated beds so that this phenomenon can be controlled and ensure the safety of structures and beds downstream. For this reason, the experiments were carried out in a flume with a fixed peak overflow with a central flow rate range of 26 to 67 liters per second and 3 mutual submerged jet flow rates. This investigation showed that the corrugated bed in the region of gradual expansion has reduced the length of the jump compared to its absence and the changes in the flow depth have also decreased. Also, the impact of the opposite jet in the submerged shape improved this process; So that energy consumption was reduced by 25-30% and jump length by 50%. Therefore, the effective role of this combination of jet system and continuous corrugated bed was shown.

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[1] Chanson, H. 2015 Energy Dissipation in Hydraulic Structures. Taylor & Francis, London, UK.
[2] Roger Bremen & Willi H. Hager, 1993. T-jump in abruptly expanding channel, Journal of Hydraulic Research, 31:1, 61-78.
[3] Torkamanzad, N., et al. (2019). Hydraulic jump below abrupt asymmetric expanding stilling basin on rough bed, Water, vol. 11, No. 9, p. 1756.
[4] Matin M.A., et al. (1997). Prediction of Sequent Depth Ratio of Free Hydraulic Jump in Abruptly enlarged Channels. Egyptian Journal for Engineering Sciences & Technology. Pages 31-36.
[5] Habibzadeh, A., et al. (2011). Exploratory study of submerged hydraulic jumps with blocks. Journal of Hydraulic Engineering, 137(6), 706- 710.
[6] Abdelhaleem, F. (2013). Effect of semi-circular baffle blocks on local scour downstream clear-overfall weirs. Ain Shams Engineering Journal, 4(4), 675-684.
[7] Herbrand, K. 1973. The Spatial Hydraulic Jump. Journal of Hydraulic Research. Pages 205-2018.
[8] Hajialigol, S., et al. (2021). Cross-beams dissipators in abruptly expanding channels: Experimental analysis of the flow patterns. Journal of Irrigation and Drainage Engineering, 147, 06021012.
[9] Scorzini, AR., Di Bacco, M., & Leopardi, M. (2016). experimental investigation on a system of crossbeams as energy dissipator in abruptly expanding channels. Journal of Hydraulic Engineering, 142(2), 06015018.
[10] Neisi, K. and Shafai Bejestan, M. (2013). Characteristics of S-jump on roughened bed stilling basin. Water Sciences Research 5 (2), 25–34.
[11] Shafai Bajestan M. and Neisi K. (2004). Effect Shape of Roughness on the Sequent Depth Ratio of Hydraulic Jump. Water and Soil Science Journal. Tabriz University, Iran. Pages 165- 176.
[12] Izadjoo F. and Shafai Bajestan M. (2007). Corrugated Bed Hydraulic Jump Stilling Basin. Journal of Applied Sciences. volume 7, issue 8, pp. 1164-1169.
[13] Kazemianzadeh A., Shafai Bajestan M. (2008). Experimental study of the effect of roughness arrangement on hydraulic jump characteristics in stilling basin, 3rd Iran Water Resources Management Conference, Tabriz University, Iran.
[14] Abbaspour, A. et al. (2009). Effect of sinusoidal corrugated bed on hydraulic jump characteristics. Journal of Hydro-environment Research, 3, pp.109-117.
[15] Parsamehr, P. and Hosseinzadehdalir, A. (2012). Experimental Study of Effect of Rough Bed on Sequent Depth Ratio of Hydraulic Jump on Adverse Slope. Irrigation Sciences and Engineering, 36(1): 89-101.
[16] Haghdoost, M. et al. (2022). Experimental study of spatial hydraulic jump stabilization using lateral jet flow. Water Supply. 1 November; 22 (11): 8337–8352.
[17] Sharoonizadeh, S., et al. (2022). Experimental investigation on the characteristics of hydraulic jump in expanding channels with a water jet injection system. Journal of Hydraulic Structures, 2022; 7(4): 58-75.
[18] Varol, F. et al. (2009). The effect of water jet on the hydraulic jump. In Thirteenth International Water Technology Conference, IWTC (Vol13, pp895-910).
[19] Wali, UG. (2013). Kinetic energy and momentum correction coefficients for a small irrigation channel. International Journal of Emerging Technology and Advanced Engineering, 3(9), 1- 8.
[20] Sharoonizadeh, S. et al. (2021). Experimental Analysis on the Use of Counterflow Jets as a System for the Stabilization of the Spatial Hydraulic Jump. Water, 2021, 13, 2572.
[21] Chow VT, 1959. Open Channel Hydraulics. Mc Grow Hill Book Co, New York, NY.
[22] Chanson, H. (2009). Development of the Bélanger equation and backwater equation by Jean-Baptiste Bélanger (1828). Hydraulic Engineering ASCE 135 (3), 159–163.
Modares Civil Engineering journal
Volume 24, Issue 1
March and April 2024
Pages 151-160