ABSTRACT
We use the stochastic framework and address different physical factors that affect contaminant spreading in an integrated soil-groundwater system, besides the random spatial heterogeneity that is commonly considered in stochastic analyses of groundwater transport. Additional factors are non-uniformity in the mean flow, longitudinal source extent and possible existence of immobile water and diffusional mass transfer. We quantify the error of neglecting any of these factors in predictions of expected contaminant fluxes through a compliance boundary.
