Presentation of Longitudinal Dispersion Data

by Philip C. Chatwin, Lect.; Dept. of Applied Mathematics and Theoretical Physics, Univ. of Liverpool, Liverpool, England,

Serial Information: Journal of the Hydraulics Division, 1980, Vol. 106, Issue 1, Pg. 71-83

Document Type: Journal Paper


It is proposed that deviations from Gaussianity of observed profiles of the concentration of a solute in a cloud as it passes the measuring station in a river, estuary or similar flow should be explicitly measured by recording the nondimensional skewness and kurtosis. Examples of applications of the proposal are examined. It is shown that observed profiles can be fitted well by Edgeworth series provided the skewness and kurtosis are not too large. Review of the way in which different causes of deviations from Gaussianity can be classified in terms of the evolution of the skewness and kurtosis with downstream position is given, and it is argued that this is the most important point of the proposal.

Subject Headings: Flow measurement | Skewness | Gaussian process | Rivers and streams | Estuaries | River flow

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