ABSTRACT
Numerous analytical model equations are available for predicting conservative contaminant migration with advection (transport in accordance with the water level hydraulic gradient and the average pore velocity) and hydrodynamic dispersion in uniformly porous aquifers. Semi-analytical model equations are available for predicting two-dimensional contaminant migration with complex source geometries and assumptions concerning uniform flow. Through molecular diffusion, contaminants migrate from zones of high concentration to zones of low concentration even in the absence of groundwater flow. If the contaminant migration model could simulate all of the variations in aquifer heterogeneities and associated velocities, dispersive migration would not have to be considered and contaminant migration would be defined in detail by the advective process. In profile, contaminant migration tends to be concentrated in the more permeable zones of uniformly porous aquifers causing fingering and irregularity in plumes. The most widely used continuous point source equation governing two-dimensional contaminant migration in a uniformly porous aquifer.
