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首页> 外文期刊>Journal of Contaminant Hydrology >Experimental investigation of compound-specific dilution of solute plumes in saturated porous media: 2-D vs. 3-D flow-through systems
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Experimental investigation of compound-specific dilution of solute plumes in saturated porous media: 2-D vs. 3-D flow-through systems

机译：饱和多孔介质中溶质羽流的化合物特异性稀释的实验研究：2-D与3-D流通系统

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摘要

Dilution of solute plumes in groundwater strongly depends on transverse mixing. Thus, the correct parameterization of transverse dispersion is of critical importance for the quantitative description of solute transport In this study we perform flow-through laboratory experiments to investigate the influence of transport dimensionality on transverse mixing. We present a high-resolution experimental setup to study solute dilution and transverse dispersion in three-dimensional porous media. We conduct multi-tracer experiments in the new 3-D setup and compare the results with the outcomes of analogous tracer experiments performed in a quasi 2-D system. We work under steady-state flow and transport conditions and consider a range of velocities relevant for groundwater flow (0.5-8 m/day). Transverse dispersion coefficients are determined from high-resolution concentration profiles at the outlet of the flow-through chambers (7 × 7 ports in the 3-D setup and 7 ports in the quasi 2-D system), considering conservative tracers with significantly different aqueous diffusion coefficients, namely fluorescein and dissolved oxygen. To quantify dilution in the 2-D and 3-D systems, we experimentally determine the flux-related dilution index using the flow rates and the concentrations measured at the inlet and outlet ports, and we propose semi-analytical expressions to predict its evolution with travel distance in uniform groundwater flow. The experimental results in the quasi 2-D and 3-D flow-through systems are consistent and show a compound-specific behavior of the transverse dispersion coefficient and its non-linear dependence on the seepage velocity in both setups. The degree of dilution and the compound-specific effects of transverse dispersion are considerably more pronounced in 3-D than in quasi 2-D transport systems.
机译：地下水中溶质羽流的稀释很大程度上取决于横向混合。因此，正确的横向弥散参数化对于溶质运移的定量描述至关重要。在这项研究中，我们进行了流通实验室实验，以研究运维对横向混合的影响。我们提供了高分辨率的实验装置，以研究三维多孔介质中的溶质稀释和横向分散。我们在新的3-D设置中进行多示踪剂实验，并将结果与​​在准2-D系统中执行的类似示踪剂实验的结果进行比较。我们在稳态流量和运输条件下工作，并考虑与地下水流量相关的一系列速度（0.5-8 m /天）。横向弥散系数由流通室出口处的高分辨率浓度分布（3-D装置中的7×7端口和准2-D系统中的7端口）确定，同时考虑了示踪剂与含水量的显着不同扩散系数，即荧光素和溶解氧。为了量化2-D和3-D系统中的稀释度，我们使用流量和在进口和出口处测得的浓度通过实验确定了与通量相关的稀释指数，并提出了半解析表达式来预测其随温度的变化。在均匀的地下水流中的传播距离。在准2-D和3-D流通系统中的实验结果是一致的，并且显示了两种设置中横向色散系数的复合特定行为及其对渗透速度的非线性依赖性。 3-D中的稀释度和化合物对横向分散的特异作用比准2-D传输系统中明显得多。

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  • 来源
    《Journal of Contaminant Hydrology》 |2015年第1期|33-47|共15页
  • 作者

    Yu Ye; Gabriele Chiogna; Olaf Cirpka; Peter Grathwohl; Massimo Rolle;

  • 作者单位

    Center for Applied Geosciences, University of Tuebingen, Hoelderlinstrasse 12, D-72074, Germany;

    Center for Applied Geosciences, University of Tuebingen, Hoelderlinstrasse 12, D-72074, Germany;

    Center for Applied Geosciences, University of Tuebingen, Hoelderlinstrasse 12, D-72074, Germany;

    Center for Applied Geosciences, University of Tuebingen, Hoelderlinstrasse 12, D-72074, Germany;

    Center for Applied Geosciences, University of Tuebingen, Hoelderlinstrasse 12, D-72074, Germany,Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, 94305 Stanford, CA, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dilution; Transverse dispersion; Mixing; Flux-related dilution index; Laboratory experiments;

    机译：稀释;横向色散混合;助焊剂相关稀释指数;实验室实验;

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