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Reactive facies: An approach for parameterizing field-scale reactive transport models using geophysical methods

机译：反应性相：一种使用地球物理方法参数化现场规模反应性输运模型的方法

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[1] Developing a predictive understanding of subsurface contaminant plume evolution and natural attenuation capacity is hindered by the inability to tractably characterize controlling reactive transport properties over field-relevant scales. Here we explore a concept of reactive facies, which is based on the hypothesis that subsurface units exist that have unique distributions of properties that influence reactive transport. We further hypothesize that geophysical methods can be used to identify and spatially distribute reactive facies and their associated parameters. We test the reactive facies concept at a U.S. Department of Energy uranium-contaminated groundwater site, where we have analyzed the relationships between laboratory and field (including radar and seismic tomographic) data sets. Our analysis suggests that there are two reactive facies that have unique distributions of mineralogy, texture, hydraulic conductivity, and geophysical attributes. We use these correlations within a Bayesian framework to integrate the dense geophysical data sets with the sparse core-based measurements. This yields high-resolution (0.25 m x 0.25 m) estimates of reactive facies and their associated properties and uncertainties along the 2-D tomographic transects. Comparison with colocated samples shows that the estimated properties fall within 95% uncertainty bounds. To illustrate the value of reactive facies characterization approach, we used the geophysically estimated properties to parameterize reactive transport models, which were then used to simulate migration of an acidic-U plume through the domain. Modeling results suggest that each identified reactive facies exerts a unique control on plume evolution, highlighting the usefulness of the reactive facies concept for spatially distributing properties that control reactive transport over field-relevant scales.
机译：[1]由于无法准确地描述与场相关的尺度上控制反应性输运特性，因此阻碍了对地下污染物羽流演变和自然衰减能力的预测性理解。在这里，我们探索反应性相的概念，该概念基于以下假设：存在具有影响反应性输运的特性的独特分布的地下单元。我们进一步假设地球物理方法可用于识别和空间分布反应相及其相关参数。我们在美国能源部铀污染的地下水现场测试了反应相概念，在那里我们分析了实验室与现场（包括雷达和地震层析成像）数据集之间的关系。我们的分析表明，有两个反应性相具有独特的矿物学，质地，水力传导率和地球物理属性分布。我们在贝叶斯框架内使用这些相关性，以将密集的地球物理数据集与基于稀疏岩心的测量结果进行集成。沿着二维断层扫描断面，可以得到高分辨率（0.25 m x 0.25 m）的反应性相及其相关性质和不确定性的估计。与共置样本的比较表明，估计的属性落在95％的不确定性范围内。为了说明反应相表征方法的价值，我们使用了地球物理估计的属性来对反应输运模型进行参数化，然后将其用于模拟酸性U羽穿过该域的迁移。建模结果表明，每个识别出的反应相对羽流演化都具有独特的控制作用，突显了反应相概念对空间分布特性的有用性，这些特性可控制与场相关的尺度上的反应性输运。

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  • 来源
    《Water resources research》 |2012年第10期|W10526.1-W10526.20|共20页
  • 作者

    Douglas S. Sassen; Susan S. Hubbard; Sergio A. Bea; Jinsong Chen; Nicolas Spycher; Miles E. Denham;

  • 作者单位

    Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Mail Stop 90R1116, Berkeley, CA 94720-8126, USA;

    Lawrence Berkeley National Laboratory, Berkeley, California, USA;

    Lawrence Berkeley National Laboratory, Berkeley, California, USA,Now at CONICET-IHLLA, Azul, Argentina;

    Lawrence Berkeley National Laboratory, Berkeley, California, USA;

    Lawrence Berkeley National Laboratory, Berkeley, California, USA;

    Environmental Science and Biotechnology, Savannah River National Laboratory, Aiken, South Carolina, USA;

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