Evolution of plume geometry, dilution and reactive mixing in porous media under highly transient flow fields at the surface water-groundwater interface

Name: Evolution of plume geometry, dilution and reactive mixing in porous media under highly transient flow fields at the surface water-groundwater interface
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doi.org2025-01-15 收录

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http://doi.org/10.17632/7x6dk5mt53.3

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Highly transient boundary conditions affect mixing processes in porous media. An example these boundaries is the case of fluctuating rivers that are in contact with the aquifer. Here we apply flow-through experiments to study the evolution of plume geometry, dilution and mixing under such transient boundary coditions, using experimental data and simulation results. The transport simulations are performed with a modified version of the MT3D-USGS (Bedekar et al., 2016), in which we implement a non-linear velocity-dependent dispersion parametrization. This dataset contains the following files: data_Figs_3_4.mat Data for Figures 3 and 4. Concentration distibution of the tracer under transient flow conditions. data_Fig_5.mat Data for Figure 5. Observed and simulated breakthrough curves for the transient flow. data_Fig_6.mat Data for Figure 6. Vertical profiles for the transient flow. data_Figs_7_8.mat Data for Figures 7 and 8. Dilution index, perimeter and area. data_Fig_9.mat Data for Figure 9. Dilution index fand critical dilution index for different mixing ratios. mt_dsp5_modified.for Modified version of the dispersion code of MT3D-USGS with non-linear velocity-dependent parametrization The original source code of MT3D-USGS can be found in https://github.com/MODFLOW-USGS/mt3d-usgs References: Bedekar, V., Morway, E.D., Langevin, C.D., and Tonkin, M., 2016, MT3D-USGS version 1.0.0: Groundwater Solute Transport Simulator for MODFLOW: U.S. Geological Survey Software Release, 30 September 2016, http://dx.doi.org/10.5066/F75T3HKD

高度易变的边界条件对多孔介质中的混合过程产生显著影响。其中，此类边界的典型例子是接触含水层的波动河流。本研究通过对流动实验的运用，以实验数据和模拟结果为基础，探讨在如此瞬态边界条件下，羽流几何形状、稀释程度及混合过程的演变。运输模拟采用MT3D-USGS（Bedekar等，2016）的修改版进行，其中我们实施了非线性的速度依赖性弥散参数化。本数据集包含以下文件： data_Figs_3_4.mat 图3和图4的数据。瞬态流动条件下的示踪剂浓度分布。 data_Fig_5.mat 图5的数据。瞬态流动的观测和模拟突破曲线。 data_Fig_6.mat 图6的数据。瞬态流动的垂直剖面。 data_Figs_7_8.mat 图7和图8的数据。稀释指数、周长和面积。 data_Fig_9.mat 图9的数据。不同混合比下的稀释指数和临界稀释指数。 mt_dsp5_modified.for 带有非线性速度依赖性参数化的MT3D-USGS弥散代码的修改版。 MT3D-USGS的原始源代码可在以下链接找到：https://github.com/MODFLOW-USGS/mt3d-usgs 参考文献： Bedekar, V., Morway, E.D., Langevin, C.D., and Tonkin, M., 2016, MT3D-USGS版本1.0.0：MODFLOW地下水溶质运移模拟器：美国地质调查局软件发布，2016年9月30日，http://dx.doi.org/10.5066/F75T3HKD

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