{"title":"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","authors":"Shabnam Hasani , Faramarz Doulati Ardejani , Mansour Ziaii","doi":"10.1016/j.jappgeo.2024.105438","DOIUrl":null,"url":null,"abstract":"<div><p>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 (<span><math><msub><mi>σ</mi><mi>b</mi></msub></math></span>) and fluid electrical conductivity (<span><math><msub><mi>σ</mi><mi>f</mi></msub></math></span>) to characterise dual-domain mass transfer (DDMT). Unexpectedly, the silica sand experiments show a hysteretic relationship between co-located <span><math><msub><mi>σ</mi><mi>f</mi></msub></math></span> and <span><math><msub><mi>σ</mi><mi>b</mi></msub></math></span>. 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 <span><math><msub><mi>σ</mi><mi>b</mi></msub></math></span> and <span><math><msub><mi>σ</mi><mi>f</mi></msub></math></span>. The root mean square error (RMSE) between the experimental and simulated <span><math><msub><mi>σ</mi><mi>f</mi></msub></math></span> 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 (<span><math><mi>α</mi></math></span>) 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.</p></div>","PeriodicalId":54882,"journal":{"name":"Journal of Applied Geophysics","volume":"227 ","pages":"Article 105438"},"PeriodicalIF":2.2000,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"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\",\"authors\":\"Shabnam Hasani , Faramarz Doulati Ardejani , Mansour Ziaii\",\"doi\":\"10.1016/j.jappgeo.2024.105438\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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 (<span><math><msub><mi>σ</mi><mi>b</mi></msub></math></span>) and fluid electrical conductivity (<span><math><msub><mi>σ</mi><mi>f</mi></msub></math></span>) to characterise dual-domain mass transfer (DDMT). Unexpectedly, the silica sand experiments show a hysteretic relationship between co-located <span><math><msub><mi>σ</mi><mi>f</mi></msub></math></span> and <span><math><msub><mi>σ</mi><mi>b</mi></msub></math></span>. 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 <span><math><msub><mi>σ</mi><mi>b</mi></msub></math></span> and <span><math><msub><mi>σ</mi><mi>f</mi></msub></math></span>. The root mean square error (RMSE) between the experimental and simulated <span><math><msub><mi>σ</mi><mi>f</mi></msub></math></span> 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 (<span><math><mi>α</mi></math></span>) 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.</p></div>\",\"PeriodicalId\":54882,\"journal\":{\"name\":\"Journal of Applied Geophysics\",\"volume\":\"227 \",\"pages\":\"Article 105438\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2024-06-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Applied Geophysics\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S092698512400154X\",\"RegionNum\":3,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Applied Geophysics","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S092698512400154X","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
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 () and fluid electrical conductivity () to characterise dual-domain mass transfer (DDMT). Unexpectedly, the silica sand experiments show a hysteretic relationship between co-located and . 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 and . The root mean square error (RMSE) between the experimental and simulated 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 () 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.
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.