Author(s)

K. Semra, Ph. Ackerer & R. Mose

Abstract

Three dimensional groundwater quality modelling in heterogeneous media K. Semra, Ph. Ackerer, R. Mose Institut de Mecanique des Fluides, Universite Louis Pasteur - [fJM CJV^a' #,%, g r^e Bo^^^mga^^ 67000 5Wa6owg, France ABSTRACT A three dimensional pollutant transport model is presented. The code is based on a particle tracking technique : the random-walk method, which is based on the analogy between the advection-dispersion equation and the Fokker-Planck equation. The velocity field is calculated by a mixed hybrid finite element method. To avoid particle accumulation in regions with dispersion contrasts, a new efficient method is developed to allow conservation of the fluxes between high and low dispersive regions. Comparisons are made on a layered aquifer example between this method and other algorithms commonly used and show the efficiency of the new method. To validate the code, a 3D experiment made on a laboratory model have been simulated. It represents a heter

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