GGSD Program Details for MOC3D

MOC3D

Category	Contaminant transport (3D)
Publisher	US Geological Survey
Platform	DOS, Mac, UNIX, DG, SGI, Sun
Status	Public domain
Description	MOC3D simulates 3D solute transport in flowing ground water. The model computes changes in concentration of a single dissolved chemical constituent over time that are caused by advective transport, hydrodynamic dispersion (including both mechanical dispersion and diffusion), mixing (or dilution) from fluid sources, and mathematically simple chemical reactions (including linear sorption, which is represented by a retardation factor, and decay). The model can also simulate groundwater age transport and the effects of double porosity and zero order growth/loss. The transport model is integrated with MODFLOW, a 3D groundwater flow model that uses implicit finite difference methods to solve the transient flow equation. MOC3D uses the method-of-characteristics to solve the transport equation on the basis of the hydraulic gradients computed with MODFLOW for a given time step. Particle tracking is used to represent advective transport and explicit finite difference methods are used to calculate the effects of other processes.
Cost	Free on WWW
Data formats supported	None stated
Supplier in United States of America	International Ground Water Modeling Center
Supplier in United States of America	US Geological Survey