MT3DMS: A Modular Three-Dimensional Multispecies Transport Model for Simulation of Advection, Dispersion, and Chemical Reactions of Contaminants in Groundwater Systems; Documentation and User's Guide
MT3DMS: A Modular Three-Dimensional Multispecies Transport Model for Simulation of Advection, Dispersion, and Chemical Reactions of Contaminants in Groundwater Systems; Documentation and User's Guide
复制标题
DOI：
--
复制
发表时间：
1999-12
期刊：
影响因子：
--
通讯作者：
C. Zheng;Paul P. Wang
中科院分区：
文献类型：
--
作者：
C. Zheng;Paul P. Wang
摘要：本手册介绍了下一代模块化三维输运模式MT 3D，该模式具有显著扩展的能力，包括增加了（a）用于求解平流项的三阶总变差减小（TVD）方案，该方案是质量守恒的，但不会引入过多的数值色散和人为振荡，（B）基于广义共轭梯度法和Lanczos/ORTHOMIN加速方案的有效迭代求解器，以消除对传输时间步长的稳定性约束，（c）容纳非平衡吸附和双域对流扩散质量传输的选项，以及（d）多组分程序结构，可容纳用于模拟一般生物和地球化学反应的附加反应包。MT3 DMS可用于模拟地下水中可混溶污染物浓度的变化，考虑平流、弥散、扩散和一些基本的化学反应，具有各种类型的边界条件和外部源或汇。模型中的基本化学反应是平衡控制或速率限制的线性或非线性吸附和一级不可逆或可逆动力学反应。MT3 DMS可以适应非常一般的空间离散化方案和传输边界条件，包括：（a）承压、非承压或非承压/非承压含水层，（B）倾斜模型层和同一层内的可变单元厚度，（c）规定的浓度或质量通量边界，以及（d）外部水力源和汇（如威尔斯、排水沟、河流、区域补给）的溶质运移效应，和蒸散量。
Abstract : This manual describes the next generation of the modular three-dimensional transport model, MT3D, with significantly expanded capabilities, including the addition of (a) 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, (b) an efficient iterative solver based on generalized conjugate gradient methods and the Lanczos/ORTHOMIN acceleration scheme to remove stability constraints on the transport time-step size, (c) options for accommodating nonequilibrium sorption and dual-domain advection-diffusion mass transport, and (d) a multicomponent program structure that can accommodate add-on reaction packages for modeling general biological and geochemical reactions. MT3DMS can be used to simulate changes in concentrations of miscible contaminants in groundwater considering advection, dispersion, diffusion, and some basic chemical reactions, with various types of boundary conditions and external sources or sinks. The basic chemical reactions included in the model are equilibrium-controlled or rate-limited linear or nonlinear sorption and first-order irreversible or reversible kinetic reactions. MT3DMS can accommodate very general spatial discretization schemes and transport boundary conditions, including: (a) confined, unconfined, or variably confined/unconfined aquifer layers, (b)inclined model layers and variable cell thickness within the same layer, (c) specified concentration or mass flux boundaries, and (d) the solute transport effects of external hydraulic sources and sinks such as wells, drains, rivers, areal recharge, and evapotranspiration.