Description |
PLUME is an analytical model for calculation of point concentration in a homogeneous aquifer resulting from a continuous, time-varying release of a single radioactive or non-radioactive component from a horizontal line source. It is assumed that the flow is unidirectional (uniform) and that the line source is situated perpendicular to the flow direction. The model accounts for advection, dispersion, retardation, and first-order decay. The plume can be described in 3D with the horizontal line source at any depth in the aquifer, or vertically averaged over the depth of the aquifer. The continuous source release function is reduced to a limited number of user-specified time/source-strength intervals by linear approximation. This approximated release function is further divided in a number of integration intervals. Simpson's rule of integration is used to superpose the effect of each of these integration intervals on the concentration distribution. The calculation of concentration data takes place on basis of a user-defined computational grid. Output includes a location/concentration file for post-modelling contouring. |