验证非局部理论在预测天然多孔介质中溶质迁移行为方面的优越性:硅砂和沸石柱中的氯化钠示踪实验

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-06-26 DOI:10.1016/j.jappgeo.2024.105438
Shabnam Hasani , Faramarz Doulati Ardejani , Mansour Ziaii
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引用次数: 0

摘要

在这里,我们使用示踪柱实验和数值方法研究了硅砂和沸石这两种介质的传输行为。氯化钠(NaCl)示踪实验是在饱和填料柱中进行的,填料柱中嵌入了电流和电位电极,用于测量同位体电导率(σb)和流体电导率(σf),以表征双域传质(DDMT)。出乎意料的是,硅砂实验显示共定位 σf 和 σb 之间存在滞后关系。场发射扫描电子显微镜(FESEM)分析结果表明,观察到的滞后现象可能是由于存在聚集颗粒。在沸石柱中进行的氯化钠示踪实验证实,粒内多孔性是储存溶质的不流动域,导致重尾突破曲线(BTC)和共位σb与σf之间的滞后。实验σf 与模拟σf 之间的均方根误差(RMSE)表明,单速率双域传质(DDMT)模型比平流-扩散方程(ADE)更能捕捉 NaCl 的突破曲线。根据蒙特卡罗分析,所获得的单速率 DDMT 参数与流速有关,因此估计的一阶传质速率系数 (α)会随着流速的增加而增加。研究结果证实,在理解天然多孔介质中的溶质迁移方面,非菲氏理论优于经典模型。研究结果还表明,除了土壤的物理和化学特性会导致非菲基性迁移外,流速对溶质物理迁移参数也起着重要作用。
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Superiority verification of the non-local theory in predicting solute transport behaviour in natural porous media: NaCl tracer experiments in the silica sand and zeolite columns

Here, we investigate transport behaviour through two types of media, silica sand and zeolite, using tracer column experiments and numerical methods. Tracer experiments with sodium chloride (NaCl) were conducted in saturated packed columns with embedded current and potential electrodes to measure co-located bulk electrical conductivity (σb) and fluid electrical conductivity (σf) to characterise dual-domain mass transfer (DDMT). Unexpectedly, the silica sand experiments show a hysteretic relationship between co-located σf and σb. Field Emission Scanning Electron Microscopy (FESEM) analysis results showed that the observed hysteresis could be due to the presence of aggregated particles. NaCl tracer experiments in the zeolite column confirmed that the intragranular porosity serves as an immobile domain to store solute, resulting in heavy-tailed breakthrough curves (BTCs) and hysteresis between co-located σb and σf. The root mean square error (RMSE) between the experimental and simulated σf revealed that the single-rate dual-domain mass transfer (DDMT) model captures the NaCl BTCs much better than the advection-dispersion equation (ADE). Based on a Monte Carlo analysis, the obtained single-rate DDMT parameters were velocity-dependent in such a way that the estimated first-order mass transfer rate coefficient (α) increased with an increase in flow rate. The findings of this research confirm the superiority of the non-Fickian theory over the classical model in understanding solute transport in natural porous media. The results also illustrate that in addition to the physical and chemical characteristics of the soil, which leads to the non-Fickian transport, the flow velocity plays an important role in physical solute transport parameters.

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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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