摘要
在室内使用特殊形状的土柱隔板成功地填装了在水平横截面上呈“川”字型分布、由质地相差较大的两种土壤相间构成的非均质土柱。当土柱出流达到稳态后，灌入CaCl2溶液，监测土柱出流液的浓度动态。通过计算表征氯离子迁移时间随机特征的概率密度函数，对出流盐分的优先运移采用传递函数模型进行仿真，并对构成非均质土柱的两种均质土壤分别进行了条件类似的水盐入渗实验和模拟。在此基础上获得了参与氯离子输运的土壤水运移体积和可动体积以及土壤溶液中氯离子的体积平均驻留浓度。
In this paper, a heterogeneous soil column was constructed in our laboratory. The column contained two kinds of homogeneous soils, which were of different texture, and was successfully constructed in the III-shaped cross-section distribution of sandy loamy and loamy clayey soil using special shape soil partition. The heterogeneous soil column(50cm×50cm×40cm) was irrigated with 0.027 mol ／ L CaCl2 solution till steady water flow in soil column occurred. The effluent was collected every 5 minutes. The data was simulated using transfer function model. The probability density functions of the logarithm of travel time of chloride were calculated, and the model parameters (i.e. mean and deviation) were obtained. In addition, the transport volumes of chloride, the volume朼veraged resident concentrations of chloride in the soil solution and other parametric values were obtained. To make a comparison between the deterministic and stochastic models, the breakthrough curves in homogenous soils were also plotted and simulated by the convection-dispersion equation.
出处
《土壤学报》
CAS
CSCD
北大核心
2001年第1期104-113,共10页
Acta Pedologica Sinica
基金
国家自然科学基金!(59579024)
地矿部环境地质开放研究实验室基金!(k96002)资助项目
关键词
非均质土壤
溶质运移
优先流
土壤盐分
随机模拟
Heterogeneous soil,Solute transport, Preferential flow, Transfer function model, Stochastic modelling, Convection-dispersion equation
