Research Article
Jun 1980
Modified Fickian Model for Predicting Dispersion
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VIEW THE REPLYAuthors: Henry Liu, M.ASCE, and Alexander H. D. ChengAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 106, Issue 6
Abstract
The ordinary Fickian model for longitudinal dispersion is modified by using a time or distance dependent dispersion coefficient with a time-scale much greater than the Fischer time scale. From the three bulk flow properties U*, A, and d¯, the asymptotic dispersion coefficient DL and the peak concentration Cmax in natural streams can be predicted within a factor of 2.5 and 1.6, respectively. The model is useful for the prediction of longitudinal spread of pollutants in rivers over both short and long distances.
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Published In
Journal of the Hydraulics Division
Volume 106 • Issue 6 • June 1980
Pages: 1021 - 1040
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© 1980 American Society of Civil Engineers.
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Published in print: Jun 1980
Published online: Feb 3, 2021
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Henry Liu, M.ASCE
Prof. of Civ. Engrg., Univ. of Missouri, Columbia, Mo.
Alexander H. D. Cheng
Research Asst., School of Civ. and Environmental Engrg., Cornell Univ., Ithaca, N.Y.
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