MT3D: A Modular Three-Dimensional Transport Model

MT3D is a comprehensive three-dimensional solute transport model for simulation of advection, dispersion and chemical reactions of contaminants in groundwater systems. MT3D was first developed by Chunmiao Zheng in 1990 at S.S. Papadopulos & Associates, Inc. with partial support from the U.S. Environmental Protection Agency (USEPA). Since 1990, MT3D has been available as a pubic domain code from the USEPA. Commercial versions with enhanced capabilities have also been available from S.S. Papadopulos & Associates, Inc. and its distributors.

MT3D is based on a modular structure to permit simulation of transport components independently or jointly. MT3D interfaces directly with the U.S. Geological Survey finite-difference groundwater flow model, MODFLOW, for the head solution, and supports all the hydrologic and discretization features of MODFLOW. MT3D has been widely accepted by practitioners and researchers alike and applied in numerous field-scale modeling studies in the United States and throughout the world. The MT3D code has a comprehensive set of solution options, including the method of characteristics (MOC), the modified method of characteristics (MMOC), a hybrid of these two methods (HMOC), and the standard finite-difference method (FDM). The availability of these solution options in one program, and the continuing enhancement and expansion of its capabilities, makes MT3D uniquely suitable for handling a wide range of field problems of very different natures. Furthermore, MT3D is supported by all major commercial graphical user interface developers, and many other companion codes for risk assessment, parameter estimation, and remediation design optimization.

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