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Modeling Dominant Transport Processes in One-Dimensional Contaminant Transport
Abstract The present work investigates the impact of scale on dispersion coefficient for the transport of a nonreactive contaminant through a homogeneous medium. A scale-dependent dispersion coefficient which varies as a power law function of distance (Dx = Dd + mxn, Dx — Dispersion coefficient, Dd — Diffusion coefficient, x — distance, and m and n are the multiplying and exponent factors which depend on the type of porous medium) was assumed. A numerical model with scale-dependent dispersion coefficient was developed and numerical experimentation carried out by varying the identified key parameters within the practical ranges. The effects of these parameters on the resulting break-through curves that describe the spread of the contaminant through the soil in one-dimensional flow and dispersion were studied. The key parameters, αD, are the ratio of rate of diffusion per unit length of the porous medium to the measured seepage velocity (αD = Dd/xVx), where Vx — measured seepage velocity) and parameter, β (= mx(n–1)/Vx), dependent on the characteristics of the porous medium. Break-through curves indicate the dominant processes of transport such as diffusion, hydrodynamic dispersion and advection.
Modeling Dominant Transport Processes in One-Dimensional Contaminant Transport
Abstract The present work investigates the impact of scale on dispersion coefficient for the transport of a nonreactive contaminant through a homogeneous medium. A scale-dependent dispersion coefficient which varies as a power law function of distance (Dx = Dd + mxn, Dx — Dispersion coefficient, Dd — Diffusion coefficient, x — distance, and m and n are the multiplying and exponent factors which depend on the type of porous medium) was assumed. A numerical model with scale-dependent dispersion coefficient was developed and numerical experimentation carried out by varying the identified key parameters within the practical ranges. The effects of these parameters on the resulting break-through curves that describe the spread of the contaminant through the soil in one-dimensional flow and dispersion were studied. The key parameters, αD, are the ratio of rate of diffusion per unit length of the porous medium to the measured seepage velocity (αD = Dd/xVx), where Vx — measured seepage velocity) and parameter, β (= mx(n–1)/Vx), dependent on the characteristics of the porous medium. Break-through curves indicate the dominant processes of transport such as diffusion, hydrodynamic dispersion and advection.
Modeling Dominant Transport Processes in One-Dimensional Contaminant Transport
Nirmala Peter, E. C. (author) / Madhav, M. R. (author) / Saibaba Reddy, E. (author) / Bharat, T. V. (author)
2010-01-01
9 pages
Article/Chapter (Book)
Electronic Resource
English
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