An analytical model of vapor intrusion with fluctuated water table

Ma, Enze; Zhang, You‐Kuan; Liang, Xiuyu

doi:10.1016/j.jhydrol.2021.126085

Cited by 12 publications

(8 citation statements)

References 51 publications

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“…This causes the increased BTEX flux from the groundwater to the atmosphere due to the enhanced dispersion [ 25 ], resulting in the surge of the BTEX concentration in the unsaturated zone. In other words, shortening the BTEX migration pathway from the groundwater can lead to greater vapor intrusion [ 26 ]. This result indicates that continuous monitoring would be able to show the weather effect, especially rainfall, and the resultant increase in the VOCs of interest underground.…”

Section: Resultsmentioning

confidence: 99%

Continuous VOCs Monitoring in Saturated and Unsaturated Zones Using Thermal Desorber and Gas Chromatography: System Development and Field Application

Baek

Hong

et al. 2022

IJERPH

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Subsurface VOC monitoring has been mainly based on manual sampling, transport, and analysis, which would require a sufficient amount of samples to ensure data accuracy and reliability, and additional costs to ensure sample quality. Therefore, a continuous on-site monitoring system is desirable for accurate measurement and subsequent risk assessment. In this study, benzene, toluene, ethylbenzene, and xylene (BTEX) were continuously monitored by the system based on a thermal desorber (TD) and gas chromatography (GC) in an oil-contaminated site that consisted of saturated and unsaturated zones. For the saturated zone, fully automated groundwater sampling and purging processes were performed, and the gasified samples were applied to the TD–GC system. For the unsaturated zone, the gaseous sample in the site was directly applied to the TD–GC system. After verifying the accuracy and precision of the monitoring system, the continuous monitoring system was successfully operated for more than a month in the field. The monitoring system used in this study is applicable to other sites for continuous monitoring, thus providing a scientific background for advanced risk assessment and policy development.

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Section: Resultsmentioning

confidence: 99%

Continuous VOCs Monitoring in Saturated and Unsaturated Zones Using Thermal Desorber and Gas Chromatography: System Development and Field Application

Baek

Hong

et al. 2022

IJERPH

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“…Equation (10) is an advection–dispersion equation with a time dependent advection (

{v_s}( t )

), which is not easy to solve analytically 15 . In this study, the recursive method is adopted to propose analytical solutions of the problem 14 …”

Section: Derivation Of the Analytical Solutionsmentioning

confidence: 99%

“…The analytical solution of Equation (15) for any time interval can be obtained using Green's function method. The auxiliary Green's function of Equation (15) can be written as 14,15 ;

\begin{equation}G\left( {z,z`,t - t`} \right) = \frac{{{e^{\frac{{{{\left( {z - z` + {v_s}t`} \right)}^2}}}{{4Dt`}}}} - {e^{ - \frac{{{{\left( {z + z` - {v_s}t`} \right)}^2} + 4z{v_s}t`}}{{4Dt`}}}}}}{{\sqrt {4\pi Dt`} }}\end{equation}

…”

Section: Derivation Of the Analytical Solutionsmentioning

confidence: 99%

“…Several analytical models were recently presented to study the performance of landfill liners (e.g., 17–22 ). However, the developments of analytical solution for such non‐linear mathematical problems (time‐dependent seepage velocity) are rather limited 12,14,15,22 . The aim of this study is to develop an analytical solution to investigate the impact of leachate head variations on the performance of a landfill liner system.…”

Section: Introductionmentioning

confidence: 99%

“…2,9,10 Analytical solutions have been widely developed in recent years to investigate contaminant transport processes as they support physical explanation of these transport phenomena and act as an invaluable component in field-scale screening and management decision support models. [11][12][13][14][15] In addition, analytical models provide a convenient and cost-effective alternative to verify numerical model. 16 Several analytical models were recently presented to study the performance of landfill liners (e.g., [17][18][19][20][21][22] ).…”

Section: Introductionmentioning

confidence: 99%

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An analytical model for contaminant transport in landfill liner with fluctuating leachate head

Xie

Thomas

et al. 2022

Num Anal Meth Geomechanics

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Leachate head in municipal solid waste (MSW) landfills can be very high (e.g., >10 m) in some Chinese landfills and can continuously change during the service life of the landfill. Variations of leachate head can induce time-dependent seepage velocity changes in the liner, which may lead to a change of transport mechanisms of contaminants. An analytical model for contaminant transport through clay liner system considering the effects of leachate head variations is presented. The analytical solution is obtained using the recursive method and the Green's function approach. The proposed analytical solution is verified by numerical results. The model is then applied to investigate the effects of variable leachate head on the transport of contaminants. The results indicated that timedependent advection arising from leachate head variations may play a significant part when investigating contaminant transport through a clay liner. The contaminant concentrations at the bottom of the liner predicted by using fixed leachate head may be underestimated compared to the case with variable leachate heads. The bottom concentration of Pb 2+ at t = 50 years for the case with H D = 60 m can be 6.6 times larger than that of the case with fixed leachate head. The mechanisms of contaminant transfer may change from a diffusion-dominated process to an advection-dominated process. For example, the molecular diffusion is the dominant process in Event 1 (e.g., t < 5 years with Peclet number < 1) while advection induced by the variations of leachate head may play a more important role for contaminant transport when t > 5 years. Increasing leachate head can result in an earlier breakthrough time and steady state for contaminant transport. The breakthrough time of DCM for the case with H D = 60 m can be 1.6 times lower than that for the case with fixed leachate head. Considering the effects of leachate head variations may be critical to design a more stable and reliable landfill liner.

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Climate‐influenced hydrobiogeochemistry and groundwater remedy design: A review

Warner

Bekele

Nathanail

et al. 2023

Remediation Journal

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The process of designing a remedy for contaminated groundwater historically has not commonly included climate‐future, hydrologic, and biogeochemical aquifer characteristics. From experience, the remedy design process also has not consistently nor directly integrated or projected future hydrologic and biogeochemical effects of the human‐induced or developed environment—aka the anthropogenic influence—on potential remedy performance. The apparent practice of (1) not regularly assessing anthro‐influenced hydrological (termed here as anthrohydrology) or biogeochemical characteristics (collectively hydrobiogeochemistry) of a site and (2) rarely accounting for future climatic shifts as design factors in remedy design may be due, in part, to the general practice‐level view that groundwater remediation systems (whether in situ or ex situ) have seldom been anticipated to last more than a few years (or one or two decades at the most). Second, methods to reliably and quantitatively estimate site‐specific, climate‐future shifts in groundwater conditions using global and/or regional climate models and the resultant impacts on contaminant plume characteristics have not been readily available. The authors here suggest that while the concept of remedy design resilience and durability, within an envelope of climate change and anthropogenic influence, has been discussed in some technical circles as a component of “sustainable remediation,” we have found that direct application of these technical concepts in quantifiable terms remains rare. By incorporating the potential influence of future hydrobiogeochemical scenarios into remedy design, however, the design process could account for reasonable climate‐induced influence on the groundwater system for a given site. These scenarios could then be applied within the remedy selection process to assess performance durability under potentially changing hydrologic, biological, and chemical conditions.

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An analytical model of vapor intrusion with fluctuated water table

Cited by 12 publications

References 51 publications

Continuous VOCs Monitoring in Saturated and Unsaturated Zones Using Thermal Desorber and Gas Chromatography: System Development and Field Application

Continuous VOCs Monitoring in Saturated and Unsaturated Zones Using Thermal Desorber and Gas Chromatography: System Development and Field Application

An analytical model for contaminant transport in landfill liner with fluctuating leachate head

Climate‐influenced hydrobiogeochemistry and groundwater remedy design: A review

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