Estimation of the Longitudinal Dispersion Coefficient Using the Velocity Profile in Natural Streams
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Volume 130, Issue 3
Abstract
In this study, a theoretical method for predicting the longitudinal dispersion coefficient is developed based on the transverse velocity distribution in natural streams. Equations of the transverse velocity profile for irregular cross sections of the natural streams are analyzed. Among the velocity profile equations tested in this study, the beta distribution equation, which is a probability density function, is considered to be the most appropriate model for explaining the complex behavior of the transverse velocity structure of irregular natural streams. The new equation for the longitudinal dispersion coefficient that is based on the beta function for the transverse velocity profile is developed. A comparison of the proposed equation with existing equations and the observed longitudinal dispersion coefficient reveals that the proposed equation shows better agreement with the observed data compared to other existing equations.
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Published In
Journal of Hydraulic Engineering
Volume 130 • Issue 3 • March 2004
Pages: 227 - 236
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jun 12, 2000
Accepted: Jul 29, 2003
Published online: Feb 19, 2004
Published in print: Mar 2004
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