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Methods based on the use of empirical equations to predict longitudinal dispersion coefficients in small natural streams are discussed in this paper. Ten equations for the prediction of dispersion coefficients are compared. The comparison is based on the results of 22 field studies for which the dispersion coefficients are directly measured using natural tracers. The technique for this direct measurement is based on a methodology derived from the classical Fickian model. Dimensional analysis is used to build up relevant mass-transport non-dimensional groups, and to produce an alternative mathematical model for the longitudinal dispersion coefficient. This model is calibrated using the multiple regression technique, and it is validated upon comparison with new data from a field study in an urban canal.

Modelos Empíricos e Semi-Empíricos para a Obtenção do Coeficiente de Dispersão Longitudinal de Pequenos Cursos de Água