Experimental Study of Sand Sediments Effects on Submerged Hydraulic Jump Properties

Abstract:

Abstract. In this study, the effect of sediment concentration on submerged hydraulic jump (SHJ) characteristics such as jump length, submerged depth on the gate and the energy dissipation is investigated. Experiments were carried out in a flume of 46 cm depth, 12 m length. The width of the flume changes from 10 cm (at the entrance) to 60 cm (at the exit). Sediment load and flow concentration have an influence on submerged hydraulic jump characteristics including submerged depth on the gate, jump length and relative energy dissipation. It is shown that at high Froude numbers increasing the suspended sediment concentration to 28.7 gr/l leads to a reduction in the submerged depth on the gate up to 6% and jump length up to 10%. Also, the energy dissipation of the submerged hydraulic jump increases by 4% and turbulence resulting from the jump leads to upright distribution of concentration at the end of the jump. Also in concentrations higher than 30 gr/l, flow is not able to carry the whole sediments and subsequently leads to their deposition in subcritical area and behind the sluice gate.

• Periodical: Applied Mechanics and Materials (Volumes 212-213)
• Pages: 366-371
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.212-213.366
• Online since: October 2012
• Authors: Siavash Haghighi, Mohammad Reza Kavianpour, Keyvan Nasiri
• Keywords: Energy Dissipation, Experimental Model, Froude Number, Sediment Concentration, Submerged Hydraulic Jump

References

[1] Dey S., and Sarkar A. 2007. Computation of Reynolds and boundary shear stress in submerged jets on rough boundaries, Journal of Hydro-environment Research, 1: 110-117.

DOI: 10.1016/j.jher.2007.10.001

[2] Dey S., and Sarkar A. 2008. Characteristics of Turbulent Flow in Submerged Jumps on Rough Beds, Journal of engineering mechanics, 134(1): 49-59.

DOI: 10.1061/(asce)0733-9399(2008)134:1(49)

[3] Ead S. A., and Rajaratnam N. 2002. Plane turbulent wall jets in shallow tailwater, J. Eng. Mech, 128(2): 143–155.

DOI: 10.1061/(asce)0733-9399(2002)128:2(143)

[4] Gamal M.M. Abdel-Aal. 2004. Modeling of rectangular submerged hydraulic jumps. Journal of Alexandria Engineering, 43(6): 847-855.

[5] Govinda Rao N.S., and Rajaratnam N. 1963. The Submerged Hydraulic Jump, Journal of Hydraulic Div, 89 (1): 139-162.

DOI: 10.1061/jyceaj.0000822

[6] Garcia M. 1993. Hydraulic jumps in sediment-driven bottom currents, Journal of Hydraulic Engineering, 119(10): 1-24.

DOI: 10.1061/(asce)0733-9429(1993)119:10(1094)

[7] Long D., Steffler P.M. and Rajaratnam N. 1990. LDA study of flow structure in submerged Hydraulic jumps, J. of Hydraulic Res, 28(4): 437-460.

DOI: 10.1080/00221689009499059

[8] Komar P.D. 1971. Hydraulic jumps in turbidity currents, Geol. Soc. Am. Bull, 82(1): 477-88.

DOI: 10.1130/0016-7606(1971)82[1477:hjitc]2.0.co;2

[9] Wu S., and Rajaratnam N. 1995. Free jumps, submerged jumps, and wall jets, J. Hydraul. Res, 33(2): 197–212.

DOI: 10.1080/00221689509498670