Turbulence in Shallow Water Flow under Rainfall

by Ismail T. Kisisel, (A.M.ASCE), Middle East Tech. Univ., Ankara, Turkey,
Ramachandra A. Rao, (A.M.ASCE), Res. Asst.; School of Civ. Engrg., Purdue Univ., Lafayette, IN,
Jacques W. Delleur, (M.ASCE), Hydr. Engr.; School of Civ. Engrg., Purdue Univ., Lafayette, IN,


Serial Information: Journal of the Engineering Mechanics Division, 1973, Vol. 99, Issue 1, Pg. 31-53


Document Type: Journal Paper

Abstract: The effects of the rainfall intensity, of the channel roughness and of the bed slope on the mean velocity and on the turbulence characteristics of shallow water flow were investigated. The mean and fluctuating velocities were measured by using constant-temperature hot-film anemometers which were equipped with specially designed cylindrical sensors. The friction factor values increased in the presence of rainfall for flows over both the smooth and rough boundaries. The mean velocity distributions were found to be logarithmic. Results of the special computations indicated that for flows with rainfall the energy content increased in the high frequency range and the spectra were modified compared to flows without rainfall. Macroscales of turbulence for flows with rainfall were found to increase whereas the microscales were found to decrease slightly toward the free surface in comparison with the macro and microscales for flows without rainfall.

Subject Headings: Turbulent flow | Turbulence | Rain water | Shallow water | Water flow | Velocity distribution | Rainfall frequency

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