Multi-scale analysis for environmental dispersion in wetland flow |
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| Institution: | 1. School of Soil & Water Conservation, Beijing Forestry University, Beijing, 100083, China;2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China;3. College of Engineering, Peking University, Beijing, 100871, China;1. Macau Environmental Research Institute, Macau University of Science and Technology, Macao, China;2. Laboratory of Systems Ecology and Sustainability Science, College of Engineering, Peking University, Beijing, China;3. State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China;4. Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;5. Department of Soil and Environmental Science, MNS-Agriculture University, Multan, Pakistan;1. State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China;2. NAAM Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia |
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| Abstract: | Presented in this work is a multi-scale analysis for longitudinal evolution of contaminant concentration in a fully developed flow through a shallow wetland channel. An environmental dispersion model for the mean concentration is devised as an extension of Taylor’s classical formulation by a multi-scale analysis. Corresponding environmental dispersivity is found identical to that determined by the method of concentration moments. For typical contaminant constituents of chemical oxygen demand, biochemical oxygen demand, total phosphorus, total nitrogen and heavy metal, the evolution of contaminant cloud is illustrated with the critical length and duration of the contaminant cloud with constituent concentration beyond some given environmental standard level. |
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