Predicting Effects of Dead Zones on Stream Mixing

by Edward L. Thackston, (A.M.ASCE), Assoc. Prof.; Dept. of Envir. and Water Resour. Engrg., Vanderbilt Univ., Nashville, TN,
Karl B. Schnelle, Jr., Assoc. Prof.; Dept. of Envir. and Water Resour. Engrg., Vanderbilt Univ., Nashville, TN,


Serial Information: Journal of the Sanitary Engineering Division, 1970, Vol. 96, Issue 2, Pg. 319-331


Document Type: Journal Paper

Discussion: Benedict Barry A. (See full record)
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Abstract: Longitudinal mixing in open-channel flow is described by two coupled partial differential equations, the solution of which, in the frequency domain, is a function of four parameters: mean residence time; Peclet number or dimensionless dispersion coefficient; fraction of stream volume which is dead zone; and mean residence time in a dead zone. The solution is given and methods of estimating the parameters from hydraulic data are described. The fraction of stream volume which is dead zone is a function of the friction factor, and the ratio of mean dead zone residence time to mean residence time in a reach is essentially a constant. The effects of errors in estimating values of the parameters are discussed and illustrated.

Subject Headings: Residence time | Parameters (statistics) | Rivers and streams | Open channels | Flow duration | Open channel flow | Coupling | Differential equations

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