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MODFLOW/MT3DMS-Based Simulation of Variable-Density Ground Water Flow and Transport

机译：基于MODFLOW / MT3DMS的变密度地下水流和运输模拟

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摘要

This paper presents an approach for coupling MODFLOW and MT3DMS for the simulation of variable-density ground water flow. MODFLOW routines were modified to solve a variable-density form of the ground water flow equation in which the density terms are calculated using an equation of state and the simulated MT3DMS solute concentrations. Changes to the MODFLOW and MT3DMS input files were kept to a minimum, and thus existing data files and data files created with most pre- and postprocessors can be used directly with the SEAWAT code. The approach was tested by simulating the Henry problem and two of the saltpool laboratory experiments (low- and high-density cases). For the Henry problem, the simulated results compared well with the steady-state semianalytic solution and also the transient isochlor movement as simulated by a finite-element model. For the saltpool problem, the simulated breakthrough curves compared better with the laboratory measurements for the low-density case than for the high-density case but showed good agreement with the measured salinity isosurfaces for both cases. Results from the test cases presented here indicate that the MODFLOW/MT3DMS approach provides accurate solutions for problems involving variable-density ground water flow and solute transport.
机译：本文提出了一种耦合MODFLOW和MT3DMS的方法来模拟可变密度地下水流。修改了MODFLOW例程，以求解地下水流方程的可变密度形式，其中使用状态方程和模拟的MT3DMS溶质浓度来计算密度项。对MODFLOW和MT3DMS输入文件的更改保持在最低限度，因此，现有的数据文件和使用大多数预处理器和后处理器创建的数据文件可以直接与SEAWAT代码一起使用。通过模拟亨利问题和两个盐池实验室实验（低密度和高密度案例）对这种方法进行了测试。对于亨利问题，模拟结果与稳态半解析解以及通过有限元模型模拟的瞬态氯离子迁移进行了很好的比较。对于盐池问题，模拟的穿透曲线与低密度情况下的实验室测量结果相比于高密度情况下的实验室测量结果更好，但在两种情况下均与测得的盐度等值面表现出良好的一致性。此处给出的测试案例的结果表明，MODFLOW / MT3DMS方法为涉及可变密度地下水流量和溶质运移的问题提供了准确的解决方案。

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