Environmental dispersivity in free-water-surface-effect dominated wetland: multi-scale analysis

Distinct from the case with width-dominated shallow wetland flows, the longitudinal evolution of contaminant concentration in the most-typical pattern of wetland as dominated by free-water-surface-effect is characterized by a multi-scale analysis in the present study. An environmental dispersion model for the evolution of the mean concentration is deduced as an extension of Taylor’s classical formulation by Mei’s multi-scale analysis. Corresponding environmental dispersivity is found identical to that determined by the method of concentration moments.

[1]  J. Fried.  Groundwater Pollution: Theory, Methodology, Modelling, and Practical Rules , 1975 .

[2]  Ge Chen,et al.  Environmental dispersion in a two-zone wetland , 2011 .

[3]  Jacob H. Masliyah,et al.  Dispersion in Porous Media , 2005 .

[4]  Anne F. Lightbody,et al.  Prediction of near-field shear dispersion in an emergent canopy with heterogeneous morphology , 2006 .

[5]  H. Nepf,et al.  Prediction of velocity profiles and longitudinal dispersion in emergent salt marsh vegetation , 2005 .

[6]  J. W. Elder.  The dispersion of marked fluid in turbulent shear flow , 1959, Journal of Fluid Mechanics.

[7]  Chiang C. Mei,et al.  Some Applications of the Homogenization Theory , 1996 .

[8]  Z. Li,et al.  Multi-scale analysis for environmental dispersion in wetland flow , 2011 .

[9]  J. A. Sullivan,et al.  A model for diffusion within emergent vegetation , 1997 .

[10]  Kumbakonam R. Rajagopal,et al.  Mechanics of Mixtures , 1995 .

[11]  E. C. Childs.  Dynamics of fluids in Porous Media , 1973 .

[12]  Guoqian Chen,et al.  An ecological risk assessment model for a pulsed contaminant emission into a wetland channel flow , 2010 .

[13]  G. Taylor.  Dispersion of soluble matter in solvent flowing slowly through a tube , 1953, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[14]  H. Fernando,et al.  Effects of emergent vegetation on lateral diffusion in wetlands. , 2004, Water research.

[15]  Marco Ghisalberti,et al.  Model and laboratory study of dispersion in flows with submerged vegetation , 2007 .

[16]  Hansong Tang,et al.  Environmental dispersion in wetland flow , 2011 .

[17]  H. Fischer.  Mixing in Inland and Coastal Waters , 1979 .

[18]  J. Lai,et al.  An extended macroscopic model for solute dispersion in confined porous media , 2008 .

[19]  Marco Ghisalberti,et al.  Retention time and dispersion associated with submerged aquatic canopies , 2007 .

[20]  Anne F. Lightbody,et al.  Prediction of velocity profiles and longitudinal dispersion in salt marsh vegetation , 2006 .

[21]  Hugo B. Fischer,et al.  Dispersion in Homogeneous Estuary Flow , 1970 .

[22]  Guoqian Chen,et al.  Ecological degradation and hydraulic dispersion of contaminant in wetland , 2011 .

[23]  H. Nepf.  Drag, turbulence, and diffusion in flow through emergent vegetation , 1999 .

[24]  Guoqian Chen,et al.  Notes on modelling of environmental transport in wetland , 2009 .

[25]  Guoqian Chen,et al.  Taylor dispersion in a packed tube , 2009 .