Predicting Dispersion Coefficient of Streams

by Henry Liu, (M.ASCE), Assoc. Prof. of Civ. Engrg.; Univ. of Missouri, Columbia, Mo.,

Serial Information: Journal of the Environmental Engineering Division, 1977, Vol. 103, Issue 1, Pg. 59-69

Document Type: Journal Paper

Discussion: Higgins Roger J. (See full record)
Discussion: Christensen Bent A. (See full record)
Discussion: Holly Forrest M. (See full record)
Closure: (See full record)


Using inspectional analysis, a simple formula has been derived which relates the longitudinal dispersion coefficient of natural streams to several bulk flow properties such as the discharge and the hydraulic radius. It is shown that the dimensionless factor, β, of the formula, unlike the dimensionless dispersion coefficient α based on Elder's equation, is independent of the size of natural streams. An analysis of existing data indicates that the value of β for any stream may be predicted within a factor of six from the frictional or resistance factor of the stream. This means the proposed equation for predicting longitudinal dispersion is more accurate than any existing method based on bulk flow properties.

Subject Headings: Rivers and streams | Hydraulic properties | Load and resistance factor design | Inspection | Water discharge | Friction | Hydrologic data | Data analysis

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