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- W4205659723 abstract "The sources of pollution, in general, are divided into nonpoint sources and point sources. Cutoff wall as a low-permeability vertical barrier has been widely employed for control and containment of these two types of pollution sources. Previous cutoff wall models mainly were limited to the nonpoint source pollution with constant concentrations. Hence, this study developed a novel two-dimensional analytical model for rapidly assessing the service performance of cutoff walls under time-dependent point source pollution. The present model considers a transient migration process coupling advection–dispersion-sorption-biodegradation in a multi-layer system, and its general solutions are derived using a combined approach of Laplace transform, finite Fourier cosine transform, variable substitution, and global matrix method. Results reveal that the service life of a cutoff wall increases exponentially with the decrease of release time for finite pulse point sources, and it increases linearly with the increase of decay coefficient for decay point sources. The previous hypothesis about the Gaussian distribution of contaminant concentration at the entrance to a cutoff wall is invalid when the point sources are separated by more than 1 m. Moreover, a comprehensive design method of a cutoff wall system under point sources pollution is proposed." @default.
- W4205659723 created "2022-01-26" @default.
- W4205659723 creator A5025051274 @default.
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- W4205659723 date "2022-03-01" @default.
- W4205659723 modified "2023-10-17" @default.
- W4205659723 title "Analytical model for degradable contaminant transport through a cutoff wall-aquifer system under time-dependent point source pollution" @default.
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- W4205659723 doi "https://doi.org/10.1016/j.compgeo.2021.104627" @default.
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