Abstract
The assessment of discharge rate and discharge period of dioxins and chlorobenzene which have contaminated the subsurface systems beneath O River, in O City is undertaken through the development of one dimensional transport model employing method of characteristic. The developed model is designed to couple the process of advection, dispersion and retardation of chlorobenzene in vertical direction representing the transport of other contaminants in the site. A variety of scenario based on mass flux and fraction of organic carbon of soil (Foc) was applied to allow the use of a number of uncertain parameters. The most reasonable simulation result indicated that the contaminants were likely to be released since 1930s until 1975, whereas the transport has been taking place until now. Moreover, the integrated modeling approach may reveal that the migration of hydrophobic compounds (i. e. dioxins) can be significantly enhanced in the presence of a solvent (i. e. chlorobenzene).
