Decision Analysis for Design of Evapotranspirative Landfill Covers

摘要

A decision framework was developed to identify the optimal cover thickness, soil type, and soil density for an evapotranspirative landfill cover. A simplified model was used to consider the hydraulic performance of several cover alternatives during a design precipitation event, neglecting effects of interflow, surface water runoff, and moisture removal due to evapotranspiration. Monte Carlo simulation was used to estimate the probability of failure of each alternative given a selected failure criterion. Expected costs for each alternative were calculated using the probability of failure and the costs associated with implementation, compaction effort, and failure. The optimal alternative was identified as having the lowest expected cost.