Submerged Radial Hydraulic Jump

by John A. McCorquodale, (A.M.ASCE), Prof. of Civ. Engrg.; Univ. of Windsor, Windsor, Ontario, Canada,
Abdelkawi M. Khalifa, Research Asst.; Civ. Engrg., Univ. of Windsor, Ontario, Canada,

Serial Information: Journal of the Hydraulics Division, 1980, Vol. 106, Issue 3, Pg. 355-367

Document Type: Journal Paper


A slight flaring of the side walls of the stilling basin can be advantageous in reducing the exit velocities. The hydraulic jump in such a stilling basin is referred to as a radial hydraulic jump. When the sluice gates discharge directly to the stilling basin, a submerged radial hydraulic jump will probably occur. An experimental study produced surface profiles, bed pressure and length characteristics for the submerged radial jump. A fourth-degree polynomial was used to describe the surface profile. The submerged radial jump lengths were found to be from 50% to 70% of the corresponding submerged rectangular jump lengths. Improved energy dissipation is also characteristic of the radial jumps. The model consisted of a 1.0-m long stilling basin with a total divergence angle of 13.5? located downstream a sluice gate. A theoretical equation is proposed to describe the relationship among: gate submergence, exit depth, initial depth, initial Froude number and basin divergence.

Subject Headings: Stilling basins | Submerging | Radiation | Hydraulic jump | Walls | Gates (hydraulic) | Water discharge | Polynomials

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