Author(s): Angel N. Menéndez; Carlos E. Laciana

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Keywords: Pollutant dispersion; dispersion coefficient; wind-driven water currents; wind-driven dispersion

Abstract: A closed expression for the dimensionless dispersion coefficient due to differential advection in the presence of wind is obtained, through integration of the associated velocity and concentration vertical profiles. Tsuruya's model is used for the velocity distribution, while the concentration profile is obtained from a simplified pollutant transport equation explicitly deduced. The expression reduces to Elder's value (≈5.9) for the particular case of no wind. Higher values arise for winds acting in the same direction as the flow; and vice versa, at least for a practical range of wind velocities. For the case in which the wind acts along a direction non-coplanar with the mean flow direction, it is proposed to apply the analysis independently to the coplanar direction and its normal, where the mean current is, then, null. For this normal direction, the dimensionless dispersion coefficient value is around 24.9. In this way, the theory can be applied to 2D-horizontal pollutant transport modeling.

DOI: https://doi.org/10.1080/00221686.2006.9521698

Year: 2006