Tracer Tests of Eddy Diffusion in Field and Model

by Maurice J. Crickmore, Principal Sci. Ofcr.; Hydr. Res. Station, Dept. of the Envir., Wallingford, Berkshire, England,

Serial Information: Journal of the Hydraulics Division, 1972, Vol. 98, Issue 10, Pg. 1737-1752

Document Type: Journal Paper


A comparison is made between hydraulic model and field of the vertical and lateral spreading of a neutrally buoyant marker fluid discharged continuously at the flow surface of a tidal channel. The results support an analysis showing that a vertically exaggerated hydraulic model distorts the behavior of the plume by exaggerating its width and suppressing its vertical development. Diffusion in the field was closer to Fickian than to the 4/3 law, and it is concluded that in this instance the diffusion is primarily a function of eddies created locally by tidal currents and bed roughness.

Subject Headings: Hydraulic models | Tides | Hydraulic roughness | Probe instruments | Eddy (fluid dynamics) | Diffusion | Field tests | Fluid flow

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