An Extended Environmental Multimedia Modeling System (EEMMS) for Landfill Case Studies

作者：Chen Zhi^*; Yuan Jing

来源：Environmental Forensics, 2009, 10(4): 336-346.

DOI：10.1080/15275920903347396

• contaminants
• environmental multimedia modeling
• landfill
• numerical analysis
• risk

Traditional environmental multimedia models (EMMs) are usually based on one-dimensional (1D) and first-order assumptions, which may cause numerical errors in the simulation results. This study presents an extended EMM system (EEMMS) for landfill case studies, which incorporates numerical analysis. EEMMS includes four component modules: air, landfill, unsaturated zone, and saturated zone (groundwater) modules. The modules are solved within the EEMMS framework using both FEM (finite element) and FDM (finite difference) methods. The results obtained using EEMMS were evaluated by comparison with analytical solutions for pollutant multimedia transport under non-uniform and unsteady conditions. Modeling results showed that FEM and FDM produced better results compared to analytical outputs. Sensitivity analysis was also conducted for modeling of the retardation process. Experimental results from a pilot scale landfill site confirmed that the predicted emission flux was consistent with the measured flux in a spatial and temporal scheme. EEMMS may provide effective risk assessment through examining the fate and transport of pollutants in a multimedia environmental system and to help the subsequent management of the resulting environmental impacts.

• 出版日期2009