Indicators for contaminant transport in wetlands |
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| Institution: | 1. Nonlinear Analysis and Applied Mathematics (NAAM)-Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;2. Department of Mathematics, University of Ioannina, 451 10 Ioannina, Greece;3. Nonlinear Dynamic Analysis Research Center, Department of Mathematics, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok 10800 Thailand;1. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, (C1033AAJ) Ciudad Autónoma de Buenos Aires, Argentina;2. Centro de Estudios Hidroambientales (CENEHA)-Facultad de Ingeniería y Ciencias Hídricas (FICH)-Universidad Nacional del Litoral (UNL), Ciudad Universitaria. Ruta Nacional N° 168 - Km 472,4, (3000), Santa Fe, Argentina;3. School of Civil, Environmental and Mining Engineering, University of Western Australia, 35 Stirling Highway, 6009 Crawley, Western Australia, Australia;1. Department of Chemistry, UGC-Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143005, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India |
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| Abstract: | Wetlands provide significant ecological services for urban regions in terms of water supply, wastewater treatment, flood storage, drought resistance, etc. For wetland flows, it is crucial to understand the process of contaminant transport as it provides scientific support for applications associated with various urban services. Two indicators respectively as the critical length and duration are frequently adopted for risk assessment of incidental release of toxic or contaminant cloud. This paper presents a review on recent progresses in the analytical study of contaminant transport in wetland flows by Taylor dispersion at the phase-average scale. The method of concentration moments is introduced. Analytical procedures for determining the key quantity of Taylor dispersivity are given for typical wetlands with free water surface, respectively as the steady flow wetlands, tidal flow wetlands, and the two-layer flow wetlands. As an example of applications, critical length and duration of the contaminant cloud in the steady flow wetlands are analyzed based on the obtained Taylor dispersivity. Results show that in contrast to the temporary, localized influence of COD on water quality, the heavy metal Pb can give rise to more severe damage. |
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| Keywords: | Urban ecological service Critical length Duration Environmental dispersion Wetland |
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