Influence of groundwater table fluctuation on the non-equilibrium transport of volatile organic contaminants in the vadose zone

Qi, Shengqi; Luo, Jian; O’Connor, David; Cao, Xiaoyuan; Hou, Deyi

doi:10.1016/j.jhydrol.2019.124353

Cited by 42 publications

(25 citation statements)

References 46 publications

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“…Guo et al (2019) also used a 1D numerical model (HYDRUS 1D) to evaluate the effects of groundwater elevation fluctuation on VI and found that emission flux changes due to groundwater fluctuation are likely to be significant at sites with shallow groundwater and permeable soil types. Similar results were also reported by Qi et al (2020).…”

Section: Transport In the Vadose Zone: Chlorinated Compoundssupporting

confidence: 92%

A Review of Recent Vapor Intrusion Modeling Work

Verginelli¹,

Yao²

2021

Groundwater Monitoring Rem

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This column reviews the general features of PHT3D Version 2, a reactive multicomponent transport model that couples the geochemical modeling software PHREEQC-2 (Parkhurst and Appelo 1999) with three-dimensional groundwater flow and transport simulators MODFLOW-2000 and MT3DMS (Zheng and Wang 1999). The original version of PHT3D was developed by Henning Prommer and Version 2 by Henning Prommer and Vincent Post (Prommer and Post 2010). More detailed information about PHT3D is available at the website http://www.pht3d.org.The review was conducted separately by two reviewers. This column is presented in two parts.

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Section: Transport In the Vadose Zone: Chlorinated Compoundssupporting

confidence: 92%

A Review of Recent Vapor Intrusion Modeling Work

Verginelli¹,

Yao²

2021

Groundwater Monitoring Rem

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“…The objective of this paper is to systematically investigate the vapor concentration distribution in the unsaturated zone and the changing process of the gaseous contaminant concentration at the building foundation crack subject to groundwater table fluctuations with a range of amplitudes and periods. In reality, daily and seasonal oscillations of the groundwater table are ubiquitous and the amplitudes of groundwater table fluctuations could range from several centimeters to meters [24][25][26]. In order to achieve this objective, a 2D numerical model is developed using COM-SOL Multiphysics.…”

Section: Introductionmentioning

confidence: 99%

How Does the Periodic Groundwater Table Fluctuation Impact on Chlorinated Vapor Intrusion?

Zhang

Yang

2021

Geofluids

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Periodic groundwater table fluctuations are found frequently in natural aquifers due to sea tides or seasonal recharge. However, their impact on the transport of volatile organic compounds in the vadose zone released from a groundwater contaminant source (i.e., vapor intrusion) has not been well known. A 2D numerical model was developed to explore vapor intrusion processes in the sandy vadose zone, subject to a fluctuating groundwater table with a range of fluctuation amplitudes and periods. A carcinogenic compound, Trichloroethylene (TCE), was chosen as the groundwater contaminant of interest in the current study and assumed to transport into the dwelling through a crack at the corner of the basement. Results showed that the resistant effect caused by high soil moisture contents in the thin capillary fringe is weakened by periodic groundwater table fluctuations, resulting in a higher concentration of gaseous TCE at the building foundation crack, in comparison with that under a static groundwater table. The increase of the gaseous TCE concentration was induced by the enhancement of diffusion and advection due to groundwater table fluctuations. Sensitivity analyses indicated that a higher amplitude and frequency of fluctuations lead to a higher TCE concentration at the crack under the dynamic equilibrium condition. Specifically, compared with the static groundwater table condition, the TCE concentration at the crack increased by one order of magnitude under the condition of groundwater table fluctuations with an amplitude of 0.2 m and a period of one day. The results obtained could provide insights into the importance of the amplitude and frequency of groundwater table fluctuations on vapor intrusion.

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Section: Introductionmentioning

confidence: 99%

“…In this particular area, groundwater table is close to sand surface which is always significantly affected by the capillary effect, resulting in complicated groundwater table dynamics (Horn, 2006). Groundwater table dynamics in the coastal aquifer are related to various coastal problems including saltwater intrusion, structure stability and biodiversity (Liu, 2013;Qi et al, 2020;Teo et al, 2003).Vertical infiltration/exfiltration of seepage flow in the swash zone is the most important water exchange mode between surface wave and groundwater, which is several orders of magnitude greater than the lateral seepage flow (Turner & Masselink, 1998). Considering the effect of capillary fringe almost occurs in the vertical direction, sand column experiments were designed to give further understandings of the capillary effect under external forcing (Allègre et al, 2014;Cartwright et al, 2006).…”

mentioning

confidence: 99%

Is the Combination of Linearized Theoretical Analysis and Sand Column Experiment Always Suitable for Estimating the Complex Effective Porosity?

Yang

Liu

Meng

2021

Water Resources Research

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Wave uprush and backwash make sand beach intermittently covered and exposed by surface flows in the swash zone. In this particular area, groundwater table is close to sand surface which is always significantly affected by the capillary effect, resulting in complicated groundwater table dynamics (Horn, 2006). Groundwater table dynamics in the coastal aquifer are related to various coastal problems including saltwater intrusion, structure stability and biodiversity (Liu, 2013;Qi et al., 2020;Teo et al., 2003).Vertical infiltration/exfiltration of seepage flow in the swash zone is the most important water exchange mode between surface wave and groundwater, which is several orders of magnitude greater than the lateral seepage flow (Turner & Masselink, 1998). Considering the effect of capillary fringe almost occurs in the vertical direction, sand column experiments were designed to give further understandings of the capillary effect under external forcing (Allègre et al., 2014;Cartwright et al., 2006). A series of sand column experiments were first designed to examine the capillary effect in the unidirectional watering and dewatering process. Gillham (1984) considered the groundwater table change with a small amount of water addition (0.3 cm). He pointed out it makes disproportionate rise (30 cm) of groundwater table in a very short time, which is due to a decreased specific yield as groundwater table approaches sand surface. Turner (1993) reported that tens of centimeters drop in groundwater table was measured during the dewatering process in the sand column when meniscus appears at sand surface. Such phenomenon was defined as the Wieringermeer effect (Hooghoudt, 1947). After investigating the effect of capillary fringe on pore-water pressure and the groundwater table variation, Hang and Liu (2018) further attributed this rapid and disproportionate change to the truncated capillary fringe and they demonstrated that when the groundwater table is close to the sand surface, the formation and disappearance of meniscus adjacent to the sand surface can make

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Influence of groundwater table fluctuation on the non-equilibrium transport of volatile organic contaminants in the vadose zone

Cited by 42 publications

References 46 publications

A Review of Recent Vapor Intrusion Modeling Work

A Review of Recent Vapor Intrusion Modeling Work

How Does the Periodic Groundwater Table Fluctuation Impact on Chlorinated Vapor Intrusion?

Is the Combination of Linearized Theoretical Analysis and Sand Column Experiment Always Suitable for Estimating the Complex Effective Porosity?

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