Pressure Fluctuations in Submerged Jump

by Sampathiengar Narasimhan, (M.ASCE), Prof. of Civ. Engrg.; Indian Inst. of Tech., Bombay, India,
V. P. Bhargava, Research Scholar; Civ. Engrg., Indian Inst. of Tech., Bombay, India,

Serial Information: Journal of the Hydraulics Division, 1976, Vol. 102, Issue 3, Pg. 339-350

Document Type: Journal Paper


Mean velocities and pressures in the submerged jump downstream of a sluice gate have been investigated. The empirical relationship between the rate of expansion of the jet and the rate of decay of the maximum velocity, um, have been obtained. The results are compared with those of classical wall jet profiles. The magnitudes and variation pattern of pressure fluctuations along the channel bottom in a free hydraulic jump have been found to agree with those of earlier investigators. The main emphasis in this paper is on the measurement of pressure fluctuations in a submerged hydraulic jump and its relationship with the efflux Froude number and submergence. It has been shown that the pressure fluctuations along channel bottom in a submerged hydraulic jump are lower than that in a free jump — a significant characteristic which may be considered in designing a mobile bed channel, since it governs the inception and rate of erosion of the channel bed.

Subject Headings: Hydraulic jump | Hydraulic pressure | Submerging | Hydraulic design | River and stream beds | Empirical equations | Decomposition | Walls

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