MODELING DOMINANT TRANSPORT PROCESSES IN ONE-DIMENSIONAL CONTAMINANT TRANSPORT
The present work investigates the impact of scale on dispersion coefficient for the transport of a non-reactive 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, aD, 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.
scale-dependency dispersion coefficient break-through curves key parameters
E.C.Nirmala PETER M.R.MADHAV E.Saibaba REDDY T.V.BHARAT
Department of Civil Engineering, Jawaharlal Nehru Technological University, Hyderabad, India Department of Civil Engineering, Indian Institute of Science, Bangalore, India
国际会议
International Symposium on Geoenvironmental Engineering(国际环境岩土工程研讨会
杭州
英文
90-98
2009-09-08（万方平台首次上网日期，不代表论文的发表时间）