Description
- Abstract:
- We present an analytical chlorinated vapor intrusion (CVI) model that can estimate source-to-indoor air concentration attenuation by simulating two-dimensional (2-D) vapor concentration profile in vertically heterogeneous soils overlying a homogenous vapor source. The analytical solution describing the 2-D soil gas transport was obtained by applying a modified Schwarz-Christoffel mapping method. A partial field validation showed that the developed model provides results (especially in terms of indoor emission rates) in line with the measured data from a case involving a building overlying a layered soil. In further testing, it was found that the new analytical model can very closely replicate the results of three dimensional (3-D) numerical models at steady state in scenarios involving layered soils overlying homogenous groundwater sources. By contrast, by adopting a two-layer approach (capillary fringe and vadose zone) as employed in the EPA implementation of the Johnson and Ettinger model, the spatially and temporally averaged indoor concentrations in the case of groundwater sources can be higher than the ones estimated by the numerical model up to two orders of magnitude. In short, the model proposed in this work can represent an easy-to-use tool that can simulate the subsurface soil gas concentration in layered soils overlying a homogenous vapor source while keeping the simplicity of an analytical approach that requires much less computational effort.
- Notes:
- This research is supported by the National Institute of Environmental Health Sciences (NIEHS) Superfund Research Program P42ES013660
Access Conditions
- Use and Reproduction
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- Attribution 4.0 International (CC BY 4.0)
Citation
Yao, Yijun, Verginelli, Iason, and Suuberg, Eric M.,
"A two-dimensional analytical model of vapor intrusion involving vertical heterogeneity"
(2017).
Brown Superfund Presentations & Publications, Brown Superfund Project 3: Indoor Air Concentration Dynamics and Vapor Intrusion Digital Archive.
Brown Digital Repository. Brown University Library.
https://repository.library.brown.edu/studio/item/bdr:841695/
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Brown Superfund Presentations & Publications
This collection contains research articles, conference papers, research posters, and slide presentations associated with Brown University Superfund Research Program's investigators and research projects.... -
Brown Superfund Project 3: Indoor Air Concentration Dynamics and Vapor Intrusion Digital Archive
This archive is for the long-term preservation and public dissemination of data and digital research products collected and created by researchers associated with Brown University Superfund Research Program Project 3: " Indoor Air Concentration Dynamics and Vapor Intrusion". Project Leader: …...