Seven methods were compared to evaluate methane flux densities in an actual municipal solid waste landfill: two accumulation chambers, two micrometeorological techniques (eddy correlation and mass balance methods), two tracer gas methods and an airborne infrared thermography. The comparison took into account scientific, technical and economic aspects.
An automatic method for measuring the radon flux at soil surfaces is described. The proposed experimental design minimises the disturbance induced by the accumulator technique widely used to measure radon exhalation from the ground. By exposing the ground surface to the normal weather conditions between two consecutive measurements, this method can be used to study, in the long term, the effects of meteorological factors on the radon flux density at the soil-atmosphere interface.
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