中文摘要：

以Br-作示踪剂,于室内实验测定原状土和扰动土的水动力弥散系数和弥散度,并进行了详细地分析研究。其中,用正态分布函数法求出了扰动土的水动力弥散系数,并通过水动力弥散系数与平均孔隙流速成正比的关系求出了其弥散度;然后,根据模拟得到的底孔出流液中离子浓度与实测值对比分析的结果,用反演方法得到原状土的水动力弥散系数及弥散度。结果表明,原状土的弥散度值与扰动土处在同一个数量级上,但其水动力弥散系数却比扰动土大2个数量级。

英文摘要：

Using the bromine ion as a tracer, hydrodynamic dispersion coefficient and dispersivity of disturbed and undisturbed soil are given more detailed experimental study in this paper. The hydrodynamic dispersion coefficient of disturbed soil is obtained from normal distribution function method. And by analysis the proportional relation between hydrodynamic dispersion coefficient and average comparing on the simulated values with observed values of porous velocity, its dispersivity is achieved. Besides, concentration of bromine ion, the undisturbed soil＇s hydrodynamic dispersion coefficient and dispersivity are obtained. Finally, their analysis results show the following two points. The dispersivity of disturbed and undisturbed soil is at the same magnitude. However, because of the average porous velocity influences, the hydrodynamic dispersion coefficient of undisturbed soil is two orders of magnitude higher than that of disturbed soil.