A new solution and data analysis for gas flow to a barometric pumping well

You, Kehua; Zhan, Hongbin; Li, Jian

doi:10.1016/j.advwatres.2010.07.008

Cited by 22 publications

(17 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fluctuations of the atmospheric pressure induce gas movement between the atmosphere and the subsurface. Gas movement in the unsaturated zone induced by natural fluctuations in atmospheric pressure is referred to as barometric pumping or atmospheric pumping [ Nilson et al ., ; Pirkle et al ., ; Auer et al ., ; Elberling et al ., ; Rossabi et al ., ; Riha , ; You et al ., ; Li et al ., ]. When the atmospheric pressure falls, gases are drawn upward out of the subsurface into the atmosphere.…”

Section: Airflow Induced By Atmospheric Pressure Fluctuationsmentioning

confidence: 99%

Review on airflow in unsaturated zones induced by natural forcings

2013

View full text Add to dashboard Cite

[1] Subsurface airflow in unsaturated zones induced by natural forcings is of importance in many environmental and engineering fields, such as environmental remediation, water infiltration and groundwater recharge, coastal soil aeration, mine and tunnel ventilation, and gas exchange between soil and atmosphere. This review synthesizes the published literature on subsurface airflow driven by natural forcings such as atmospheric pressure fluctuations, topographic effect, water table fluctuations, and water infiltration. The present state of knowledge concerning the mechanisms, analytical and numerical models, and environmental and engineering applications related to the naturally occurring airflow is discussed. Airflow induced by atmospheric pressure fluctuations is studied the most because of the applications to environmental remediation and transport of trace gases from soil to atmosphere, which are very important in understanding biogeochemical cycling and global change. Airflow induced by infiltration is also an extensively investigated topic because of its implications in rainfall infiltration and groundwater recharge. Airflow induced by water table fluctuations is important in coastal areas because it plays an important role in coastal environmental remediation and ecological systems. Airflow induced by topographic effect is studied the least. However, it has important applications in unsaturated zone gas transport and natural ventilation of mines and tunnels. Finally, the similarities and differences in the characteristics of the air pressure and airflow are compared and future research efforts are recommended.Citation: Kuang, X., J. J. Jiao, and H. Li (2013), Review on airflow in unsaturated zones induced by natural forcings, Water Resour.

show abstract

Section: Airflow Induced By Atmospheric Pressure Fluctuationsmentioning

confidence: 99%

Review on airflow in unsaturated zones induced by natural forcings

2013

View full text Add to dashboard Cite

show abstract

“…In this study, TIC was determined to be the primary air transport mechanism inside the borehole, yet the fact that barometric pumping did not play a significant role (Figures a5 and b5) needs further discussion, especially noting that barometric pumping has been previously reported as the main transport mechanism inside boreholes (e.g., Neeper, ; You et al, ). We argue that the borehole geometry is the main parameter that determines which transport mechanisms will be more significant.…”

Section: Resultsmentioning

confidence: 73%

Mechanisms Controlling Air Stratification Within a Large Diameter Borehole and Atmospheric Exchange

et al. 2018

View full text Add to dashboard Cite

Large boreholes dot the landscape across much of the arid low latitudes. Here we explore air dynamics within these features to understand their significance to gas transport at the Earth‐atmosphere interface. We instrumented a large‐diameter (3.4 m) borehole and the borehole‐atmosphere interface to explore under natural conditions the role of atmospheric variability on gas transport down to the water table at a depth of 59 m. Two independent tracers that naturally existed inside the borehole, water vapor and CO2, were used to map diffusive and advective transport regions and rates. We hypothesize that temporal variations in atmospheric and borehole air temperature determine the transport regime; thus, we conducted two separate 1‐month observations, during summer and winter. Of several potential air transport mechanisms known to act within cavities, thermal‐induced convection (TIC) was found to be the dominating advective mechanism inside the borehole. During winter, TIC circulated atmospheric air throughout the entire borehole down to the water table. During summer, however, atmospheric air reached only down to the middle of the borehole, indicating stable stratification below that depth; TIC was limited to the upper mixed layer overlying a diffusive transport layer. During times when TIC was suppressed, the stratified borehole air developed relatively low temperatures, and accumulated elevated CO2 concentrations and high vapor content, which were then vented to the atmosphere during convective active periods.

show abstract

“…More recently, Rossabi (2006) reviewed barometric pumping. You et al (2010) presented a two‐dimensional solution for gas flow during PSVE. You et al (2011) reviewed analytical methods for PSVE and presented an analysis of gas flow when controlled by a check valve.…”

Section: Review Of Passive Soil Vapor Extractionmentioning

confidence: 99%

“…You et al (2011) reviewed analytical methods for PSVE and presented an analysis of gas flow when controlled by a check valve. The two studies by You et al (2010, 2011) did not include contaminant transport. Jennings and Patil (2002) noted that application of PSVE has been hindered by the absence of procedures for estimating its effectiveness.…”

Section: Review Of Passive Soil Vapor Extractionmentioning

confidence: 99%

Transport by Oscillatory Flow in Soils with Rate‐Limited Mass Transfer: 1. Theory

Neeper

Stauffer

2012

Vadose Zone Journal

View full text Add to dashboard Cite

Oscillatory flow of fluid in a porous medium can generate a one‐way transport of heat or chemicals if there is a gradient of temperature or chemical concentration and a rate‐limited heat or mass transfer between the moving fluid and an immobile phase. For chemical transport in soils, the immobile phase can occur in stagnant porosity, by sorption, or by dissolution of a vapor in the pore water. As a function of oscillation frequency, the transport rate has a broad peak near the value ωτc = 1, where ω is the angular frequency of oscillation and τc is the characteristic equilibration time of the mobile phase. The transport rate is proportional to the gradient and to the square of the amplitude of periodic fluid displacement. A unique diffusivity derived from the analysis enables prediction of the long‐term transport by a diffusion calculation without fluid flow, thereby providing a tool for estimating the removal of contaminant vapors by passive soil vapor extraction (PSVE). We compared predictions of the analytic theory with numerical simulations of PSVE. The mobile–immobile model is also applicable to transport in other cases of oscillatory flow in porous media, including cyclic motion of water or gas due to tidal aquifers or earth tides.

show abstract

A new solution and data analysis for gas flow to a barometric pumping well

Cited by 22 publications

References 25 publications

Review on airflow in unsaturated zones induced by natural forcings

Review on airflow in unsaturated zones induced by natural forcings

Mechanisms Controlling Air Stratification Within a Large Diameter Borehole and Atmospheric Exchange

Transport by Oscillatory Flow in Soils with Rate‐Limited Mass Transfer: 1. Theory

Contact Info

Product

Resources

About