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Simulating MODFLOW-Based Reactive Transport Under Radially Symmetric Flow Conditions

机译：在径向对称流动条件下模拟基于MODFLOW的反应性传输

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摘要

Radially symmetric flow and solute transport around point sources and sinks is an important specialized topic of groundwater hydraulics. Analysis of radial flow fields is routinely used to determine heads and flows in the vicinity of point sources or sinks. Increasingly, studies also consider solute transport, biogeochemical processes, and thermal changes that occur in the vicinity of point sources/sinks. Commonly, the analysis of hydraulic processes involves numerical or (semi-) analytical modeling methods. For the description of solute transport, analytical solutions are only available for the most basic transport phenomena. Solving advanced transport problems numerically is often associated with a significant computational burden. However, where axis-symmetry applies, computational cost can be decreased substantially in comparison with full three-dimensional (3D) solutions. In this study, we explore several techniques of simulating conservative and reactive transport within radial flow fields using MODFLOW as the flow simulator, based on its widespread use and ability to be coupled with multiple solute and reactive transport codes of different complexity. The selected transport simulators are MT3DMS and PHT3D. Computational efficiency and accuracy of the approaches are evaluated through comparisons with full 2D/3D model simulations, analytical solutions, and benchmark problems. We demonstrate that radial transport models are capable of accurately reproducing a wide variety of conservative and reactive transport problems provided that an adequate spatial discretization and advection scheme is selected. For the investigated test problems, the computational load was substantially reduced, with the improvement varying, depending on the complexity of the considered reaction network.
机译：围绕点源和汇的径向对称流动和溶质运移是地下水水力学的一个重要专业课题。通常使用径向流场分析来确定点源或汇附近的水头和水流。越来越多的研究也考虑了在点源/汇附近发生的溶质运移，生物地球化学过程和热变化。通常，液压过程的分析涉及数值或（半）分析建模方法。为了描述溶质运移，分析解决方案仅适用于最基本的运移现象。从数字上解决高级运输问题通常会带来巨大的计算负担。但是，在采用轴对称的情况下，与完整的三维（3D）解决方案相比，计算成本可以大大降低。在这项研究中，我们基于MODFLOW作为流动模拟器的广泛应用以及与多种不同复杂性的溶质和反应性运移代码相结合的能力，探索了几种使用MODFLOW作为流动模拟器来模拟径向流场内的保守和反应性输运的技术。所选的传输模拟器是MT3DMS和PHT3D。通过与完整的2D / 3D模型仿真，分析解决方案和基准问题进行比较，评估了方法的计算效率和准确性。我们证明，只要选择了适当的空间离散化和对流方案，径向传输模型就能准确地再现各种保守和反应性传输问题。对于所研究的测试问题，根据所考虑的反应网络的复杂性，计算量显着减少，且改进程度有所不同。

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  • 来源
    《Ground water》 |2013年第3期|398-413|共16页
  • 作者

    Ilka Wallis; Henning Prommer; Vincent Post; Alexander Vandenbohede; Craig T. Simmons;

  • 作者单位

    School of the Environment, Flinders University, Adelaide, GPO Box 2100, SA 5001, Australia;

    CSIRO Land and Water, Private Bag No. 5, Wembley WA 6913, Australia,School of Earth and Environment, The University of Western Australia, Crawley, 6009,National Centre for Groundwater Research and Training, Flinders University, Adelaide, GPO Box 2100, SA 5001, Australia;

    National Centre for Groundwater Research and Training, Flinders University, Adelaide, GPO Box 2100, SA 5001, Australia,School of the Environment, Flinders University, Adelaide, GPO Box 2100, SA 5001, Australia;

    Department of Geology and Soil Science, Ghent University, Krijgslaan 281 (S8), B-9000 Gent, Belgium;

    National Centre for Groundwater Research and Training, Flinders University, Adelaide, GPO Box 2100, SA 5001, Australia,School of the Environment, Flinders University, Adelaide, GPO Box 2100, SA 5001, Australia;

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