Abstract

ABSTRACT Flow and environmental dispersion are necessary in water management systems. To better understand contaminant transport in wetland flows with adjacent aquatic vegetation and riparian buffers, a two-zone-model wetland is considered to characterize the water flow and environmental dispersion. Many researchers developed a dispersion model to characterize the mean concentration subject to the first-order degradation effect, present study attempts to derive an analytical dispersion model to discuss the transverse mean concentration of pollutants subject to second-order degradation effects in a width-dominated wetland flow. In addition, this study attempts to highlight the effect of environmental parameters like vegetation, viscous friction, and relative width on flow velocity. Also, the transverse mean concentration in the longitudinal direction is derived based on Mei’s multi-scale perturbation approach and analyzed with different degradation reaction rates. In a second-order reaction, higher degradation rate at a high concentration zone, contaminants degrade more effectively at the source than in a first-order reaction. It is conveyed that the pollutant transport is influenced by various parameters such as Peclet number, tortuosity, vegetation constraint, and dispersion time. For a specific water quality standard in wetlands, the maximal length and duration of the affected area for the common pollutant lead (Pb) is assessed and presented graphically; also, compared with a single zone.

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