Force Fluctuations on Sill of Hydraulic Jump

by Rangaswami Narayanan, Lect.; Dept. of Civ. and Structural Engrg., Univ. of Manchester Inst. of Sci. and Tech., Manchester, England,
L. S. Schizas, Site Engr.; J & P (UK) Ltd., London, England,

Serial Information: Journal of the Hydraulics Division, 1980, Vol. 106, Issue 4, Pg. 589-599

Document Type: Journal Paper


Fluctuations of force exerted on the sill of a forced hydraulic jump have been measured and presented in terms of their root-mean-square values. Experiments involved a wide range of flow conditions, various distances of the sill from the efflux, and four different heights of the sill. Maximum intensity of force fluctuations occurs when the toe of the jump begins to be sensitive to the depth downstream of the sill. Under those conditions, the spectra of fluctuations exhibit a dominant frequency. At high submergence the intensity depends essentially on the height of the sill.

Subject Headings: Reefs and sills | Hydraulic jump | Statistics | Rivers and streams | Submerging

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