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首页> 外文期刊>Journal of Contaminant Hydrology >Evaluation of dispersivity coefficients by means of a laboratory image analysis
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Evaluation of dispersivity coefficients by means of a laboratory image analysis

机译：通过实验室图像分析评估分散系数

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摘要

This paper describes the application of an innovative procedure that allows the estimation of longitudinal and transverse dispersivities in an experimental plume devised in a laboratory sandbox. The phenomenon of transport in porous media is studied using sodium fluorescein as tracer. The fluorescent excitation was achieved by using blue light and the concentration data were obtained through the processing of side wall images collected with a high resolution color digital camera. After a calibration process, the relationship between the luminosity of the emitted fluorescence and the fluorescein concentration was determined at each point of the sandbox. The relationships were used to describe the evolution of the transport process quantitatively throughout the entire domain. Some check tests were performed in order to verify the reliability of the experimental device. Numerical flow and transport models of the sandbox were developed and calibrated comparing computed and observed flow rates and breakthrough curves. The estimation of the dispersivity coefficients was carried out by analyzing the concentration field deduced from the images collected during the experiments; the dispersivity coefficients were evaluated in the domain zones where the tracer affected the porous medium under the hypothesis that the transport phenomenon is described by advection-dispersion equation (ADE) and by computing the differential components of the concentration by means of a numerical leap-frog scheme. The values determined agree with the ones referred in literature for similar media and with the coefficients obtained by calibrating the numerical model. Very interesting considerations have been made from the analysis of the performance of the methodology at different locations in the flow domain and phases of the plume evolution.
机译：本文介绍了一种创新方法的应用，该方法可以估算在实验室沙箱中设计的实验羽中的纵向和横向分散度。以荧光素钠为示踪剂研究了多孔介质中的迁移现象。通过使用蓝光实现荧光激发，并且通过处理高分辨率彩色数码相机收集的侧壁图像获得浓度数据。在校准过程之后，在沙箱的每个点确定发射的荧光的发光度和荧光素浓度之间的关系。这些关系用于定量描述整个域中运输过程的演变。为了验证实验装置的可靠性，进行了一些检查测试。开发并校准了沙箱的数值流模型和运输模型，比较了计算出的流量和观察到的流量以及穿透曲线。通过分析从实验过程中收集的图像得出的浓度场来估计分散系数。假设示踪剂影响多孔介质的区域区域中的扩散系数是通过对流扩散方程（ADE）描述输运现象并通过数值跳变法计算浓度的微分成分的假设来评估的方案。所确定的值与文献中针对相似介质所引用的值以及通过校准数值模型获得的系数一致。通过在流域的不同位置和羽流演化阶段对方法的性能进行分析，做出了非常有趣的考虑。

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  • 来源
    《Journal of Contaminant Hydrology》 |2015年第1期|10-23|共14页
  • 作者

    Donato Citarella; Fausto Cupola; Maria Giovanna Tanda; Andrea Zanini;

  • 作者单位

    Dipartimento di Ingegneria Civile, dell'Ambiente, del Territorio e Architettura, Universita degli Studi di Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy;

    Dipartimento di Ingegneria Civile, dell'Ambiente, del Territorio e Architettura, Universita degli Studi di Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy;

    Dipartimento di Ingegneria Civile, dell'Ambiente, del Territorio e Architettura, Universita degli Studi di Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy;

    Dipartimento di Ingegneria Civile, dell'Ambiente, del Territorio e Architettura, Universita degli Studi di Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy;

  • 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

    Sandbox; Groundwater transport; Image processing; Fluorescein; Dispersivity coefficients;

    机译：沙盒地下水运输;图像处理;荧光素;色散系数;

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