不流动水对黄土包气带溶质运移影响的实验研究

本文利用自动控制负压方法进行了非饱和条件下的黄土不流动水溶质运移实验，并用MIENESOR模型及其计算机程序模拟了该实验，得到不流动含水量比例系数为0.47、流动水与不流动水之间的浓度传输率为0.003/d。参数的灵敏度分析表明：同样条件下，不流动含水量比例系数最敏感，其值越大，溶质迁移越快；流动水与不流动水之间的浓度传输率影响溶质穿透曲线的峰位，其值越大，峰位越低。在研究黄土包气带污染质运移时，应密切关注这两个参数。

Experimental study on effect of immobile water on solute transport in aerated zone of loess

The transport of solute in unsaturated loess is studied in laboratory by means of a special installation in which the ambient pressure can be automatically controlled to negative. The model namely MIENESOR is used to simulate the experimental process. The result indicates that the ratio of immobile water content to total water content is 0.47 and the rate of mass transfer between mobile water and immobile water is 0.003/d.The sensitivity analysis shows the ratio of immobile water content to total water content is the most sensitive parameter. The higher the value, the quicker the solute transfers. Moreover, the rate of mass transfer between mobile water and immobile water may affect the peak height of the solute breakthrough curve. The higher rate corresponds to lower peak height. It means that these two parameters are important in study of solute transport in aerated zone of groundwater.