GGSD Program Details for RANDOM WALK

RANDOM WALK

Category	Contaminant transport (2D analytical)
Platform	DOS
Status	Public domain
Description	RANDOM WALK is a generalised code for simulation of 2D groundwater flow and solute transport using either analytical solutions or a 2D version of the PLASM finite difference model. The solute transport portion of the code is based on a particle-in-a cell technique for the convective mechanisms and a random-walk technique for the dispersion effects. The model also handles first-order decay, linear equilibrium sorption (retardation), and zero-order production, nonsteady/steady flow problems in heterogeneous aquifers under water table and/or artesian or leaky artesian conditions, time-varying pumpage or injection by wells, natural or artificial recharge, the flow relationships between surface water and ground-water, evapotranspiration, conversion of storage coefficients from artisan to water table conditions, and flow from springs. The model supports variable (rectangular) grid cells, various time stepping options. Runs in batch mode. Example data sets are provided, which can be copied and edited with a text editor for individual problems. Results and input are send to ASCII text files. The IGWMC distribution of RANDOM WALK includes RW2D which solves in an uncoupled fashion both the equation for saturated 2D horizontal flow and the advective-dispersive solute transport equation for a single non-conservative constituent.
Cost	US Dollars 125
Data formats supported	None stated
Supplier in United States of America	International Ground Water Modeling Center