Evaluation of Optimal Performance of Hydraulic Barriers in Offshore Landfill using Seepage-Advection-Dispersion Analysis under Steady State Flow

摘要

This study was conducted to propose the optimum minimum requirement of cutoff system composed of the impermeable soil layer and vertical barrier in offshore landfill for prevention pollution leakage by seepage,advection,and dispersion numerical analyses under steady state.According to the study results,the minimum requirement of impermeable soil layer is below 1 × 10-6 cm/s of hydraulic conductivity with more than 500 cm thickness or a system with equivalent cutoff effect.The minimum requirement of vertical barrier is below 1 × 10-6 cm/s of hydraulic conductivity with more than 50 cm thickness or a system with equivalent cutoff effect.In addition,the vertical barrier should be embedded enough to seal securely with the impermeable soil layer for working cutoff effect.