Diffusion of Sediment in Developing Flow

by Robert P. Apmann, (A.M.ASCE), Asst. Prof. of Engrg. and Appl. Sci.; State Univ. of New York at Buffalo, Buffalo, NY,
Ralph R. Rumer, Jr., (M.ASCE), Prof. of Engrg. and Appl. Sci., Chmn.; Civ. Engrg. Dept., State Univ. of New York at Buffalo, Buffalo, NY,

Serial Information: Journal of the Hydraulics Division, 1970, Vol. 96, Issue 1, Pg. 109-123

Document Type: Journal Paper


The suspension of sediment particles by turbulent eddy diffusion in a nonuniform flow region was studied, using the convective-diffusion equation as a mathematical model. A simplified form of the equation, for which mixing characteristics and flow velocities was assumed uniform, was found to accurately describe the sediment concentration profiles which had been measured in a 24-ft-long flume. Although diffusivities in the nonuniform region tended towards uniformity with downstream distance, the vertical diffusive transport rate was related to depth as a power law function. Measured diffusion coefficients were found to depend on the relative roughness of the mobile bed.

Subject Headings: Flow measurement | Diffusion | Sediment | Suspended sediment | Nonuniform flow | Particles | Turbulent diffusion | Eddy (fluid dynamics)

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