【摘要】 对流弥散方程(CDE)是模拟重金属在土壤中动态的常用方法之一。本文运用动态饱和土柱实验比较了重金属镉(Cd)在不同质地的碱性土壤中吸附和运移特征,并运用Batch实验获得的吸附参数作为初始值,应用所建数学模型模拟了排水条件下Cd在饱和土壤中的吸附和运移过程。结果表明,不同质地的土壤对Cd运移的阻滞作用有所差别;水动力弥散作用对Cd在土壤中的运移过程有明显的影响。对流弥散方程能较好地模拟排水条件下Cd在饱和土壤中的运移过程。更多还原

【Abstract】 The characteristics of adsorption and transport of Cadmium (Cd) in saturated alkaline soil with different texture under the condition of drainage are experimentally studied in laboratory. The adsorption parameters obtained from Batch experiment are used as the initial value for simulating the adsorption and transport process by using the mathematical model based on the theory of dilute transport in porous medium. The comparison of simulation result with experimental data shows that the retention effect of soil on transport of Cd varies with soil textures, and the convective-dispersion affects the adsorption process obviously. It is concluded that the transport of Cd in saturated soil under the condition of drainage can be well simulated by the convective-dispersion equation.更多还原