title: Estimation of methane emission flux at landfill surface using laser methane detector: Influence of gauge pressure.
abstract: The aim of this study was to investigate the possibility of measuring methane emission fluxes, using surface methane concentration and gauge pressure, by analyzing the influence of gauge pressure on the methane emission flux and the surface methane concentration, as well as the correlation between the methane emission flux and surface methane concentrations. The surface methane concentration was measured using a laser methane detector. Our results show a positive linear relationship between the surface methane concentration and the methane emission flux. Furthermore, the methane emission flux showed a positive linear relationship with the gauge pressure; this implies that when the surface methane concentration and the surface gauge pressure are measured simultaneously, the methane emission flux can be calculated using Darcy's law. A decrease in the vertical permeability was observed when the gauge pressure was increased, because reducing the vertical permeability may lead to a reduced landfill gas emission to the atmosphere, and landfill gas would be accumulated inside the landfill. Finally, this method is simple and can allow for a greater number of measurements during a relatively shorter period. Thus, it provides a better representation of the significant space and time variations in methane emission fluxes.
authors.affiliation: Ecowillplus Co. Ltd, Republic of Korea.
authors.forename: Jin-Kyu
authors.initials: JK
authors.lastname: Park
authors.affiliation: Ecowillplus Co. Ltd, Republic of Korea.
authors.forename: Jong-Yun
authors.initials: JY
authors.lastname: Kang
authors.affiliation: Department of Environmental and Energy Engineering, Anyang University, Republic of Korea nhlee@anyang.ac.kr.
authors.forename: Nam-Hoon
authors.initials: NH
authors.lastname: Lee
mesh_terms: D007834:Lasers; D008697:Methane / Q000032:analysis*; D008962:Models, Theoretical; D011312:Pressure; D056910:Republic of Korea; D064091:Waste Disposal Facilities
chemical_list: D008697:Methane
keywords: Landfill; gauge pressure; laser methane detector; methane emission flux; surface methane concentration; vertical permeability