A mathematical model to estimate errors associated with closed flux chambers |
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Authors: | D G M Senevirathna G Achari J P A Hettiaratchi |
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Institution: | (1) Department of Civil Engineering, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada |
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Abstract: | Errors associated with the closed flux chamber technique, used to measure surface emissions from landfills, were investigated
by using a combination of numerical modeling and laboratory studies. A transient-state, advective–dispersive–reactive model
was developed and used in conjunction with its steady-state version to quantify the errors associated with closed flux chambers.
In developing the model, all four major gases, CH4, O2, CO2, and N2, and the oxidation of CH4 to CO2 were considered. Laboratory experiments were conducted on a monolayered as well as a two-layered landfill cover system to
calibrate and verify the model. The model was used to develop a plot of the percentage errors associated with closed flux
chambers of different dimensions and surface flux rates. |
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Keywords: | landfills closed flux chambers numerical model surface emission laboratory investigation errors |
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