MODELING OF LEAKAGE THROUGH LANDFILL BOTTOM LINER AND OVERFLOW FROM WASTE STORAGE DAM UNDER VARIOUS OPTIONS FOR DESIGN, CONSTRUCTION AND MAINTENANCE

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  • 埋立地からの浸出水漏水・溢流量推定モデルの作成

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Leakage of leachate through landfill bottom liner and overflow of leachate from waste storage dam were modeled under various options for design, construction and maintenance. The model includes lateral flow on an intermediate cover, a bypass flow through vertical pipes (ex. gas venting pipes), and leachate accumulation in a landfill caused by clogging of leachate collection pipes and inadequate capacity of leachate storage pond. By using this model, the amounts of leakage through three types of bottom liners were calculated and compared. Moreover, the mounts of leakage and overflow were calculated under various options for design, construction, maintenance and waste characteristics. The calculation results showed that the hydraulic conductivity of sand drainage layer, the number of geomembrane sheet defects, the diameter of a sheet defect and the hydraulic conductivity of clay used in the single composite liner incresed leakage rate severely. This shows that for the reduction of leakage rate through the bottom liner, the selection of material for sand drainage layer, quality assurance of sheet, technical skill of operators and the installation of clay liner are very important. In addition, the calculation results showed that the functional failure of gas collection pipe could cause overflow of leachate from waste storage dam, particularly when the soil with low permeability was used as the cover material.

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