Journal
COMPUTERS AND GEOTECHNICS
Volume 128, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2020.103816
Keywords
Cutoff wall; Two-dimensional transport; Biodegradation; Advection; Diffusion; Semi-analytical solution
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Funding
- National Natural Science Foundation of China [41572265, 41931289, 41725012]
- Shanghai Shuguang Scheme [16SG19]
- Fundamental Research Funds for Central Universities of China [0200219152]
- Department of Education Science and Technology Research Project of Jiangxi Province in China [GJJ180586]
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Cutoff walls are widely used as in-situ vertical barriers to control pollution plumes migration in aquifer. A twodimensional analytical model for the transport of organic contaminants through a layered subsurface system with a cutoff wall is developed. The model considers a coupled advection-dispersion-adsorption-degradation process in the whole system and a non-uniform concentration distribution of a contaminant source with respect to depth. The solution was effectively validated against a one-dimensional analytical solution and a two-dimensional numerical solution. The migration behavior of contaminants in the triple-layer system and the service performance of a cutoff wall are investigated. It is demonstrated that the previous one-dimensional contaminant migration solution would underestimate the polluted ranges but overestimate the migration distance. The consideration of a non-uniformly distributed contamination source is of great importance, especially for narrowly contaminated aquifer. The biodegradation in a cutoff wall has a significant influence on the transport of an organic contaminant through the layered system when its half-life in the cutoff wall is less than 5 years, and this effect would be enhanced when the biodegradation in natural soil is also considered. The proposed model is a practical tool for performing a comprehensive design of the location and thickness of a cutoff wall.
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