A BRIEF HISTORY OF MT3D
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). Starting in 1990, MT3D was released as a pubic domain code from the USEPA. Commercial versions with enhanced capabilities were also made 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).
MT3DMS is the second generation of the modular three-dimensional transport model MT3D. MT3DMS was developed with funding from the U.S. Army Corps of Engineers Waterways Experiment Station under the Strategic Environmental Research and Development Program (SERDP).
MT3DMS has significantly expanded capabilities, including the addition of, 1) a third-order total-variation-diminishing (TVD) scheme for solving the advection term that is mass conservative but does not introduce excessive numerical dispersion and artificial oscillation; 2) an efficient iterative solver based on generalized conjugate gradient methods and the Lanczos/ORTHOMIN acceleration scheme to remove stability constraints on the transport time stepsize; 3) options for accommodating nonequilibrium sorption and dual-domain advection-diffusion mass transport; and 4) a multi-component program structure that can accommodate add-on reaction packages for modeling general biological and geochemical reactions.
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