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非均质饱和土壤盐分优先运移的随机模拟
引用本文:任理,秦耀东,王济.非均质饱和土壤盐分优先运移的随机模拟[J].土壤学报,2001,38(1):104-113.
作者姓名:任理  秦耀东  王济
作者单位:中国农业大学土壤和水科学系,
基金项目:国家自然科学基金(59579024)和地矿部环境地质开放研究实验室基金(k96002)资助项目
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。

关 键 词:非均质土壤  溶质运移  优先流  传递函数模型  随机模拟  对流—弥散方程
收稿时间:1999/12/15 0:00:00
修稿时间:1999年12月15

STOCHASTIC MODELLING OF CHLORIDE TRAVEL IN HETEROGENEOUS SATURATED SOILS UNDER THE CONDITION OF PREFERENTIAL FLOW
Ren Li,Qin Yao-dong and Wang Ji.STOCHASTIC MODELLING OF CHLORIDE TRAVEL IN HETEROGENEOUS SATURATED SOILS UNDER THE CONDITION OF PREFERENTIAL FLOW[J].Acta Pedologica Sinica,2001,38(1):104-113.
Authors:Ren Li  Qin Yao-dong and Wang Ji
Institution:China Agricultural University, Beijing 100094;China Agricultural University, Beijing 100094;China Agricultural University, Beijing 100094
Abstract: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-averaged 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.
Keywords:Heterogeneous soil  Solute transport  Preferential flow  Transfer function model  Stochastic modelling  Convection-dispersion equation
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