Abstract
AbstractThe present research deals with an analytical solution of convection-diffusion equation which represents the water phase based superficial concentration in a vegetated wetland. Gill’s series expansion method is used to obtain the dispersion coefficient and mean concentration distribution of the settling particles. For the limiting case of vegetation factor, tortuosity and settling velocity, the dispersivity is compared with the earlier research work and an excellent agreement is achieved with them. Effects of settling velocity, tortuosity and vegetation factor, on the dispersion coefficient and mean concentration are observed. A physical application is performed to predict the critical length of the concentration cloud beyond the ecological safe level. It is seen that with the increment of settling velocity, the duration for safe level increases. Moreover, the study provides two important criteria for wastewater treatment namely critical length and duration of solute cloud in the wetland. The work may also be applicable to investigate the sedimentation process and flood damage control.KeywordsVegetated wetlandGill’s series expansion methodDispersionSettling velocityCritical length
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