American Society of Civil Engineers


Numerical Modelling of the Contaminant Transport through Stratified Soil


by Tadikonda V. Bharat, Ph.D., (Student, Department of Civil Engineering, Indian Institute of Science, Bangalore - 560012, INDIA E-mail: tvbharat@gmail.com), Puvvadi V. Sivapullaiah, (Professor, Department of Civil Engineering, Indian Institute of Science, Bangalore - 560012, INDIA), and Mehter M. Allam, (Professor, Department of Civil Engineering, Indian Institute of Science, Bangalore - 560012, INDIA)

pp. 766-773, (doi:  http://dx.doi.org/10.1061/40972(311)95)

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Document type: Conference Proceeding Paper
Part of: GeoCongress 2008: Characterization, Monitoring, and Modeling of GeoSystems
Abstract: The transport processes of the dissolved chemicals in stratified or layered soils have been studied for several decades. In case of the solute transport through stratified layers, interface condition plays an important role in determining appropriate transport parameters. First- type and third- type interface conditions are generally used in the literature. A first-type interface condition will result in a continuous concentration profile across the interface at the expense of solute mass balance. On the other hand, a discontinuity in concentration develops when a third- type interface condition is used. To overcome this problem, a combined first- and third- type condition at the interface has been widely employed which yields second- type condition. This results in a similar break-through curve irrespective of the layering order, which is non-physical. In this work, an interface condition is proposed which satisfies the mass balance implicitly and brings the distinction between the breakthrough curves for different layering sequence corroborating with the experimental observations. This is in disagreement with the earlier work by H. M. Selim and co-workers but, well agreement with the hypothetical result by Bosma and van der Zee; and Van der Zee.


ASCE Subject Headings:
Groundwater pollution
Numerical models