Grain size analysis and permeametry are common methods for estimating the hydraulic conductivity (K) of porous media. It is well known that these methods have limited accuracy when they are used to characterize natural sediments. However, hydrogeological research has increasingly introduced technologies dependent on engineered porous media that may be less problematic because complex geologic structures are eliminated in the lab and field‐scale packings. The recently introduced Horizontal Reactive Media Treatment Wells (HRX® Wells), for in situ, passive remediation of groundwater is one such example. The HRX Well passively collects groundwater and directs it through a horizontal pipe packed with an engineered porous medium. In this project, grain size analysis was conducted for sand and sand‐iron mixtures to estimate K using the 16 algorithms provided in the HydrogeoSieveXL2.3.2 software. The results were compared to K determined by permeametry and a field‐scale column, 30 cm long and 25 cm in diameter, representing an HRX Well. The best comparability of K estimates from grain size analysis and permeametry were obtained using the USBR, Slichter, and Shepherd K estimation methods. These also showed good agreement between lab‐scale and field‐scale K estimations, with reproducibility within the range ±20%. This study shows that laboratory K estimations can be representative across various relevant scales, including the field‐scale, for engineered porous media. This finding extends to filter packs, and other engineered porous media design methods by emphasizing and demonstrating one case of accuracy in lab‐scale permeability estimation for field‐scale implementations.

中文翻译：

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粒度分析和渗透法估算工程多孔介质中的水力传导率

粒度分析和渗透法是估算水力传导率的常用方法（K）的多孔介质。众所周知，这些方法用于表征天然沉积物时，其准确性有限。但是，水文地质研究越来越多地引入了依赖工程多孔介质的技术，由于在实验室和现场规模的包装中消除了复杂的地质结构，因此问题可能较少。这样的例子之一就是最近引入的水平反应介质处理井（HRX®井），用于地下水的原位，被动修复。HRX井被动地收集地下水，并将其通过装有工程多孔介质的水平管引导。在该项目中，对砂和砂铁混合物进行了粒度分析，以估算K使用HydrogeoSieveXL2.3.2软件中提供的16种算法。将结果与通过渗透测定法和长30厘米，直径25厘米，代表HRX井的现场规模色谱柱测定的K进行比较。使用USBR，Slichter和Shepherd K估算方法，可以从粒度分析和渗透法获得K估算值的最佳可比性。这些还表明实验室规模和现场规模的K估计值之间具有良好的一致性，重现性在±20％的范围内。这项研究表明，实验室K估计值可以代表各种相关规模，包括工程规模的多孔介质的现场规模。这一发现通过强调和证明一种用于现场规模实施的实验室规模渗透率估算的精度案例，扩展到了滤清器包和其他工程多孔介质设计方法。