粘土衬垫系统污染物迁移规律研究

对通过土工合成粘土衬垫(GCL)和压实粘土衬垫(CCL)的污染物质量浓度分布、平流量、扩散量及积聚等进行了计算分析并讨论了污染物通过GCL和CCL迁移的各种情况．计算分析结果表明：GCL底部质量浓度比的增长速度比CCL的快得多；通过GCL和CCL的扩散量随时间减小，平流量随时间增加。但二者随时间的变化不同步；前lla，污染物通过GCL的迁移量大于通过CCL的迁移量。lla以后，通过CCL的迁移量大于通过GCL的迁移量，这种趋势贯穿于废弃物处理系统的整个有效运行期间．

Regularity of contaminant transport through geosynthetic clay liners

The details regarding contaminant transport through geosynthetic clay liners (GCLs) and compacted clay liners (CCLs) are obtained by a numerical analysis, which include distributions of concentration ratio, changes of advective and diffusive mass fluxes, and contaminant accumulation. It is shown that the concentration ratio at the base of a GCL increases much faster than that at the base of a CCL, that the diffusive mass flux decreases and the advective mass flux increases with time for both GCLs and CCLs, and that the changes of diffusive and advective mass fluxes for the GCL and CCL are not synchronous with one another. Results also indicate that the total contaminant accumulation across a GCL is greater than that across a CCL during the first 11 year. After 11 years, the total contaminant accumulation through a CCL exceeds that through a GCL. This trend continues throughout the lifetime of the respective systems.