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Effect of wind and ecological-degradation on environmental dispersion for three-layer depth-dominated wetland flow.

Authors :
Mondal, Buddhadeb
Barman, Krishnendu
Debnath, Koustuv
Source :
International Journal of Heat & Fluid Flow. Sep2024, Vol. 108, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

• A three-layer depth-dominated wetland flow is studied under the effects of ecological-degradation and free-surface-wind. • The maximum value of mean concentration decreases due to the increase of ecological-degradation reaction rates and wind intensity. • Environmental dispersivity is derived using multi-scale homogenization technique. • The maximum critical length and time duration is greatly change for the wind force and its direction. A three-layer depth-dominated wetland flow with ecological-degradation and free-surface-wind effect is studied to comprehend the contaminant transport in wetlands with aquatic vegetation that find wide application in agricultural water pollution management, and wastewater treatment. The present paper attempts to highlight the effect of wind on depth-dominated velocity and environmental dispersion in terms of longitudinal mean concentration. Also, the longitudinal mean concentration is analysed taking the effect of different ecological-degradation reaction rates for each layer. It is observed that the peak level of mean concentration decreases with the increase of both ecological-degradation reaction rate and wind intensity. The velocity distribution and environmental dispersion are derived analytically from the basic momentum and mass transport equations. Results indicate that the velocity and dispersion coefficient are greatly influenced by the wind force, in terms of its magnitude as well as the direction. To measure the environmental dispersivity, a Mei's multi-scale analysis is performed. For the typical contaminant Pb , the critical length and time duration of the region influenced by the contaminant transport are analytically derived and its dependence on different wind intensities is explored. Further, the present paper presents the comparison of the critical length and time of the pollutant affected area between the three-layer and two-layer wetland flow. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0142727X
Volume :
108
Database :
Academic Search Index
Journal :
International Journal of Heat & Fluid Flow
Publication Type :
Academic Journal
Accession number :
178639076
Full Text :
https://doi.org/10.1016/j.ijheatfluidflow.2024.109443