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Experimental verification of the contaminant transport in the aquifer incorporating advection, dispersion and sorption processes

Aniszewski A.

Archives of Hydro-Engineering and Environmental Mechanics

2005

Vol. 52, nr 3

195-212

The paper addresses the site verification of the practical 2D-mathematical model of conservative and passive contaminant transport in the groundwater stream incorporating also, except the advection and dispersion processes, the source (negative) term of reversible sorption. It is generally assumed, that local equilibrium conditions exist between the aqueous (free)-phase and the solid (sorption)-phase for the sorption process being considered. For such an equilibrium-controlled state, the term of reversible sorption can be described by the linear or non-linear adsorption (desorption) isotherms in relation to statics of this process. In this analysis the Freundlich equilibrium isotherm was accepted, which is also widely applied in practice. In this 2D-mathematical model the numerical solution (using the finite difference method), calculated values of the longitudinal and transverse dispersion coefficients (Dx, Dy) as well as the adsorption parameters (K, N) were used. To facilitate the numerical solutions, the modified calculation programme "PCCS-1" was also worked out. The calculated maximal values of chloride concentrations based on this model were compared with the measured chloride concentrations in those chosen for these verification piezometers installed in the natural aquifer. The calculated values of relative deviations (between the calculated and the measured concentrations in relation to the measured concentrations) proved the sufficient accuracy of the numerical solution of the contaminant transport model in groundwater stream presented with the non-linear source term representing the adsorption process. The calculations proved also the low adsorption capacity in the aquifer chosen for verification. The site verification of the presented 2D-mathematical model of contaminant transport in ground medium proved the possibility of practical usage of this model for engineering calculations of the contaminant concentration fields in the natural aquifers.