Unsteady Mixing of a Buoyant Jet into a Reservoir

by Dennis E. Ford, Ford, Thornton, Norton &, Associates Ltd, Little Rock, AR, USA,
Marc C. Johnson, Ford, Thornton, Norton &, Associates Ltd, Little Rock, AR, USA,

Document Type: Proceeding Paper

Part of: Water for Resource Development


A buoyant effluent was dyed with fluorescent dye on two occasions to determine its mixing characteristics and flow path through a small hydropower reservoir located in south central Arkansas. In both dye studies, all of the mixing and dilution of the effluent occurred upstream of the plunge point. After plunging, the dye concentrations remained constant in both studies. Even though the mean daily flow was three times larger in the first study, the dye cloud moved at about the same speed in both studies. Although the mixing processes were complex, simple empirical relationship for jet entrainment and constant diffusion models predicted dilutions within one order of magnitude when the time of travel was known.

Subject Headings: Jets (fluid) | Reservoirs | Dyes | Effluents | Dilution | Hydro power | Diffusion (thermal) | Thermal analysis | Arkansas

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