Mechanics of Sheet Flow under Simulated Rainfall

by Yong Nam Yoon, (A.M.ASCE), Asst. Prof.; Dept. of Civ. Engrg., Korean Military Academy, Seoul, Korea,
Harry G. Wenzel, Jr., (M.ASCE), Assoc. Prof.; Dept. of Civ. Engrg., Univ. of Illinois, Urbana, IL,

Serial Information: Journal of the Hydraulics Division, 1971, Vol. 97, Issue 9, Pg. 1367-1386

Document Type: Journal Paper


Friction factors are presented for spatially varied sheet flow with rainfall on a hydraulically smooth surface as obtained from both surface profile and hot film surface probe measurements. The results are presented in the form f = C/R, in which C increases with rainfall intensity and surface slope. A two-part velocity profile mathematical model based on von Karman's similarity hypothesis is presented and correlated with hot film measurements. Relative longitudinal turbulence intensity profiles with rainfall are characterized by a sharp increase in relative intensity near the surface and a general increase throughout the depth with increasing rainfall. Turbulent energy spectral analyses indicate that the rainfall causes a shift of the energy content to higher frequencies than for the case of uniform flow at the same Reynolds number.

Subject Headings: Sheet flow | Flow simulation | Overland flow | Rainfall intensity | Sheets | Rainfall | Flow measurement | Power spectral density

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