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Variations of Longitudinal Moments for a Contaminant Transport in Physically and Chemically Heterogeneous Media  

Seo, Byong-Min (Department of Environmental Engineering, Hoseo University)
Jung, Joon-Oh (Department of Environmental Engineering, Hoseo University)
Kim, Young-Woo (Department of Automotive Engineering, Hoseo University)
Hwang, Seung-Min (Graduate School of Venture, Hoseo, University)
Publication Information
The Journal of Engineering Geology / v.19, no.1, 2009 , pp. 81-88 More about this Journal
Abstract
Two dimensional Monte-Carlo simulations of a non-reactive solute plume in isotropic porous media which are physically and chemically heterogeneous are conducted to determine the variations of moment. Retardation factors of 1, 2 and 5 are given to ascertain how the second moments are changed as adsorption increased. Retarded longitudinal second spatial moment, ${Z_{11}}^{, increased during the transport process and as the dimensionless lengths of line plume source, $l_2, increased. ${Z_{11}}^{ decreased as the retardation factors increased, and the simulated moments fit well to the first-order analytical results. Retarded longitudinal plume centroid variance, ${Z_{11}}^{, decreased as the dimensionless lengths of line plume source, $l_2, increased and as the retardation factor increased. The result indicates that the uncertainty about the plume center decreased, and the ergodic condition for the second spatial moments is far from reaching. Simulated longitudinal one particle displacement covariance, ${Z_{11}}^{, well consistent with the first-order analytical results for the three degrees of retardation factors of 1, 2 and 5 respectively. It is, consequently, concluded that the retarded longitudinal second moments could be produced by stochastic simulation, and that the first-order analytical results definitely provides very close values of the longitudinal retarded moments.
Keywords
groundwave; retardation; heterogeneous; stochastic; non-ergodic transport;
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