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A mathematical model to estimate errors associated with closed flux chambers
Authors:D G M Senevirathna  G Achari  J P A Hettiaratchi
Institution:(1) Department of Civil Engineering, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
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.
Keywords:landfills  closed flux chambers  numerical model  surface emission  laboratory investigation  errors
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