Category Contaminant transport (2D analytical)
Publisher  International Ground Water Modeling Center 
Platform DOS
Status Commercial
Description RWH is an analytical version of the RANDOM WALK flow and solute transport model, specifically designed for screening and educational purposes. It simulates solute transport from one or more sources in a homogeneous, isotropic, confined aquifer of constant thickness and infinite extent. It accounts for 1D or 2D steady-state regional ground-water flow and the superposed effects of varying-rate production and injection wells using the transient Theis equation. The transport equation is solved via the particle-in-a-cell technique for convection and the random walk technique for dispersion. Options for linear retardation and first-order decay are included. A user-defined number of particles, each with their own mass, are introduced at one or more linear, rectangular or circular sources. Particles are removed from the system through one or more discharging wells or a no-stress line sink. At each time step the program calculates the position of each particle and provides optional particle mapping, calculation and graphic display of the spatial concentration distribution, global mass balance, and file output of results. It also provides an option for calculating the concentration over time in a sink. Menu-driven facilitates interactive data entry and editing and includes graphic screen display of simulation progress and results. Data can be entered manually or from a file prepared by the program in an earlier session. Results are saved in ASCII text files, including files for further post-processing.
Cost US Dollars 125
Data formats supported None stated
Supplier in United States of America  International Ground Water Modeling Center 

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