Groundwater pollution by organic compounds: a two-dimensional analysis of contaminant transport in stratified porous media with multiple sources of non-equilibrium partitioning
✍ Scribed by Elzein, Abbas H.; Booker, John R.
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 169 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0363-9061
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✦ Synopsis
Transport of pollutants in soil and groundwater often occurs in strati"ed media under non-equilibrium conditions. Con"ned aquifers are usually bounded by low-permeability layers of soil which have been shown to exert a signi"cant in#uence on the fate of contaminants in groundwater. Numerical solutions of transport equations have usually been restricted to single layers and have included single sources of non-equilibrium processes or none at all. The e!ect of soil strati"cation itself has sometimes been reduced to a transportbased non-equilibrium process.
A boundary element solution of the transport equations in the Laplace domain is extended to include multiple sources of non-equilibrium processes in saturated media under the assumption of rate-limited mass transfer. Green functions accurately model in"nite and semi-in"nite domains such as soils and Laplace transforms remove the need for time-stepping and the associated numerical complexity. The proposed numerical technique is validated by comparing its results to analytical solutions. Its scope is illustrated through a case study of a sand aquifer bounded by less permeable layers of silt, and in"ltrated by pollutants from a neighbouring lake.