Determination of the environmental impact of consolidation induced convective transport through capped sediment.

摘要: Abstract The presence of contaminated sediment poses a barrier to essential waterway maintenance and construction in many ports harbors, which support 95% US foreign trade. Cost effective solutions remediate sediments waterways need be applied. Capping is the least expensive remediation alternative available for marine that unsuitable open water disposal. Dredged material capping situ alternatives, however, are not widely used because regulatory agencies concerned about potential contaminant migration through caps. Numerous studies have been conducted on effects diffusion caps, there lack experimental data documenting consolidation induced transport contaminants This study examines convective capped utilizing research centrifuge. In this study, was modeled 7 h at 100×g, time 8 years prototype 100 times larger than centrifuge model. hydrodynamic dispersion function seepage velocity. And, advection dominated contaminants. Centrifuge model results were compared an analytical solution dispersion. advection–dispersion equation demonstrated test conservative estimate predicting transport. conducting sensitivity analysis modeling, as decreased, breakthrough increased. Moreover, distribution coefficient increased, concentration into overlying decreased.