摘要
通过分析重金属污染物在地下环境系统中迁移转化特征,建立了包气带土壤水分运移模型和重金属污染物传输耦合数学模型,并分别采用隐式差分和算子劈裂方法对模型进行数值求解。数值模拟结果表明:重金属镉在地下环境系统中的浓度范围将沿地下水水流方向逐渐扩展,同一点位的浓度值呈逐渐增大的趋势,并且粘性土壤比砂性土壤对重金属具有较强的截留能力。这不仅为煤矸石在地下环境系统中迁移的动态规律,预测煤矸石堆放在周围可能造成的污染规律和污染程度提供理论指导,而且还可为对矿区开采前的规划与管理以及环境评价提供决策依据。
A coupled mathematical model for soil moisture and heavy metal migration was developed based on analyzing the characteristics of migration and transformation of heavy metal leaching from coal waste spoils in the subsurface. Solutions to the coupled model were accomplished by finite difference method and splitting operator method. Numerical results show that the pollution range has a trend of increasing with longer time, and heavy metal concentration values increase at the same location. The clay soil has higher capability of holding heavy metal than sandy soil. The main reason is that soils with more clay tend to hold water. The coarser the texture of the soil, the greater the chance of the heavy metals reaching groundwater. It provides theoretical instruction for the dynamic law of heavy metal migration in the subsurface and the decision basis of environmental evaluation and management before mine area exploitation.
出处
《辽宁工程技术大学学报（自然科学版）》
EI
CAS
北大核心
2005年第5期763-766,共4页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金资助项目(50309015
50374041)
武汉市青年科技晨光计划项目(20055003059-33)
关键词
煤矸石
重金属污染
水动力学模型
有限差分
数值模拟
coal mine spoils
heavy metal pollution
dynamic model
finite difference
numerical simulation
