Departmental Bulletin Paper Development of Laser Scanning Method for Estimation of Spatial Distribution of Methane Emission in A Landfill

Lando, Asiyanthi Tabran  ,  Nakayama, Hirofumi  ,  Shimaoka, Takayuki

75 ( 1 )  , pp.29 - 46 , 2015-07-31 , Faculty of Engineering, Kyushu University
We proposed a method, named Laser Method which is used Laser Methane Detector (LMD) as a detector of ambient methane. This method is divided into three: hanged-LMD, held-LMD, and Laser Scanning (LS) Method and was used in two studies: lab scale and field study. The aims of these studies are The objectives of these studies are to describe methane concentrations (underground and ambient) and flux profile from different flow rates, wind speed, and cover utilization; to perceive the influence of wind speed and cover utilization of LMD in ambient methane concentrations measurements; to cognize the relationship between ambient methane concentrations and methane flux; to estimate methane emissions from the relationships; and to describe spatial distribution from methane emission estimation. These studies indicate that ambient methane concentration and methane flux has a positive correlation and the correlation equation may be used to estimate methane emissions from landfill and the spatial distribution of estimation could be described. Wind and cover utilization have influence in these studies. In lab scale study, highest wind speed yielded lowest concentration. Moreover, measurements with using a cover become more precise than without using a cover. The cover could prevent the measurement from wind influence and outside interference.

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