Abstract
A 2-D nonpoint source contaminant transport behaviour in the aquifer system (100 × 50 m) using a mobile-immobile (MIM) model with variable dispersion function for various soil-type (sand, silt, clayey loam, and sandy loam) was investigated. A Finite-difference method-based Crank-Nicolson scheme was used to obtain the concentration by solving governing equations of MIM model for contaminant transport in groundwater system in the 2-D spatial domain. The temporal evolution of concentration profiles and breakthrough curves were compared for conservative and reactive cases due to pulse-type and continuous source boundary conditions. Zeroth and first temporal moments (ZTM and FTM) were computed by implementing numerical integration to investigate the effect of soil type on plume evolution dynamics. A significant variation in the magnitude and spatio-temporal distribution of contaminant plume was observed between low (silt, clayey loam, sandy loam) and high (sand) hydraulic conductivity soil-type. The spreading of a contaminant plume in the transverse direction was dominant in the clayey loam and sandy loam compared to sand soil-type. The maximum value of mass recovery for the reactive contaminant was found to be much lower (2–8 order less) than the conservative case and followed the order as sand > silt > clayey loam soil-type, showing the influence of hydraulic conductivity on plume evolution dynamics. On the basis of maximum value, the FTM of reactive contaminant for all soil-type was found to be 0.5% to 2% higher than the conservative case; whereas, for locations near to contaminant source region, the FTM of reactive contaminant was found to be ~9–11% higher than conservative case. The dual-porosity model-based approach implemented in this study can be used for scenarios where fluctuations in the water table and non-Fickian mass transfer occur.
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Guleria, A., Chakma, S. (2022). Effects of Soil Type on Contaminant Transport in the Aquifer System: A Numerical Investigation Using 2D Mobile-Immobile Model. In: Ashish, D.K., de Brito, J. (eds) Environmental Restoration. F-EIR 2021. Lecture Notes in Civil Engineering, vol 232. Springer, Cham. https://doi.org/10.1007/978-3-030-96202-9_12
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