The Horizontal Reactive Media Treatment Well (HRX Well®) is a technology capable of collecting and treating groundwater passively. To monitor the internal flow rate, ensuring it remains at an acceptable level and maintains the desired capture zone size in the aquifer, Point Velocity Probes (PVPs) were adapted for the task. The modified PVP was assessed for its performance in a mock-HRX Well setting, which consisted of a laboratory sand column, similar in diameter to the HRX Well cartridges that would house the PVP in the field, with flow directed along the longitudinal axis of the probe. Experiments were conducted to assess 1) the effects of friction between the fluid and the probe surface, which could bias a velocity measurement low, and 2) the effect of gas in the porous medium, potentially generated by some reactive media, on PVP signals and measurements of velocity. It was determined that PVP length exerted no discernable effect on the quality of the PVP performance. However, the effects of gas in the porous medium were varied. Compared to velocity estimates assuming a fully saturated porous medium, the bias to velocity measurements was negative if gas was limited to locations near a PVP's injection-detection array, such as might occur by inadvertent bubble injection during the tracer pulses. The bias was positive if the gas was generated uniformly throughout the porous medium, such as might occur in a reactive porous medium like granular iron, or one featuring vigorous biological activity. A field trial of the HRX Well was subsequently undertaken with internal PVPs. The PVPs identified a missing seal that was later retrofit, and documented flow in the HRX Well at velocities in the range of 1.3 to 4.0 m/d, which compared well with expectations based on a site model that predicted velocities of 1.3 to 2.3 m/d. The results of this study demonstrate that HRX Wells perform hydraulically as designed, and that PVPs are effective devices for tracking flow rates within them in near real-time.

水平反应介质处理井（HRXWell®）是一项能够被动收集和处理地下水的技术。为了监视内部流速，确保内部流速保持在可接受的水平，并在含水层中保持所需的捕获区域大小，对点流速探头（PVP）进行了调整。修改后的PVP在模拟HRX井设置中的性能进行了评估，该设置由一个实验室沙柱组成，直径与在现场容纳PVP的HRX井滤芯的直径相似，且流量沿井的纵轴定向探测。进行实验以评估1）流体与探头表面之间的摩擦影响，这可能会使速度测量值偏低； 2）多孔介质中的气体（可能由某些反应性介质产生）的影响，关于PVP信号和速度测量。已确定PVP长度对PVP性能的质量没有明显的影响。但是，多孔介质中气体的影响是多种多样的。与假设多孔介质完全饱和的速度估算值相比，如果将气体限制在PVP注入检测阵列附近，例如在示踪脉冲期间由于无意中的气泡注入而产生的速度，则速度测量结果的偏差为负。如果气体在整个多孔介质中均匀地生成，例如在诸如颗粒铁之类的反应性多孔介质或具有强烈生物活性的介质中可能发生，则偏差为正。随后，内部PVP进行了HRX井的现场试验。PVP发现了缺少的密封件，随后进行了改装，并记录了HRX井中流速在1.3到4.0 m / d范围内的流量，这与根据预测速度在1.3到2.3 m / d的现场模型所获得的预期相比较。这项研究的结果表明，HRX Wells按设计的液压方式运行，并且PVP是有效跟踪近乎实时的流速的有效装置。