Experiments and Simulations on Plume Spreading by Engineered Injection and Extraction in Refractive Index Matched Porous Media
Experiments and Simulations on Plume Spreading by Engineered Injection and Extraction in Refractive Index Matched Porous Media
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DOI：
10.1029/2022wr032943
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发表时间：
2023-01
影响因子：
5.4
通讯作者：
L. J. Sather;E. J. Roth;R. Neupauer;J. Crimaldi;D. Mays
中科院分区：
文献类型：
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作者：
L. J. Sather;E. J. Roth;R. Neupauer;J. Crimaldi;D. Mays
工程注入与提取(EIE)是一种原位地下水修复策略，它施加一个时空变化的工程速度场，将修正扩散到污染物羽流中，通过反应促进混合和污染物降解。在这里，我们提供了一套协调的实验室实验和数值模拟，使用两个抽运序列来应用EIE：一个是通过拉伸和折叠来操纵羽流几何的折叠序列，另一个是根据先前报道的主动扩散理论施加垂直于羽流界面的速度的振荡序列。实验室实验研究了使用折射率匹配的多孔介质和激光诱导荧光的非反应示踪剂的扩散和混合，在复制之间具有显著的重复性。数值模拟与实验结果相吻合，并通过后处理顺序注入代表污染物和修正的非反应性示踪剂羽流来模拟反应输运，假设反应迅速(即高达姆勒数)。本研究首次用达西尺度成像方法验证了EIE，证明了一种新的模拟高达姆数极限下反应输运的实验方法，并证实了主动扩散理论。
Engineered injection and extraction (EIE) is an in situ groundwater remediation strategy that imposes an engineered spatially and temporally varying velocity field to spread an amendment into the contaminant plume to promote mixing and contaminant degradation through reaction. Here we present a coordinated suite of laboratory experiments and numerical simulations that apply EIE using two pumping sequences: A folding sequence that manipulates plume geometry by stretching and folding, and an oscillating sequence that imposes velocity perpendicular to the plume interface in accordance with previously‐reported active spreading theory. Laboratory experiments investigated spreading and mixing of a non‐reactive tracer using refractive index matched porous media and laser‐induced fluorescence, with remarkable reproducibility between replicates. Numerical simulations matched the experimental results and simulated reactive transport by post‐processing sequentially injected non‐reactive tracer plumes representing the contaminant and the amendment assuming rapid reaction (i.e., high Damköhler number). This study provides the first experimental verification of EIE using Darcy‐scale imaging, demonstrates a novel experimental method to mimic reactive transport at the high‐Damköhler number limit, and confirms active spreading theory.