包气带水入渗过程中水化学组分运移规律研究

A study of the migration of chemical compositions in vadose water infiltration

选择华北平原典型地区,利用多功能观测竖井,通过采集、测试包气带水溶液中的水化学组分,研究了包气带水在入渗过程中水化学组分的运移转化规律,利用氯质量平衡法分析了包气带水中化学组分变化机理。结果表明:(1)包气带水入渗过程可导致不同深度的包气带水化学组分浓度发生变化;(2)粘性土层对包气带水入渗有一定的阻碍作用,但在某些特定条件下,包气带水仍然可以穿过粘性土层,水中的化学组分亦随之下移;(3)包气带水向下运移过程发生了水化学组分的混合。

Migration of chemical compositions in vadose water infiltration of different depths is examined in this paper by using the muhifunction shaft in a typical area of the North China Plain. The chloride mass balance method is used to analyze the mechanism of changes in chemical compositions in the vadose water of different depths. The results show that （1） the vadose water infiltration can lead to changes in concentrations of chemical compositions in the vadose water of different depths ; （2） the sticky soil can prevent the vadose water from migrating downward, but the vadose water is allowed to migrate downward through itself under certain conditions. At the same time, the chemical compositions in the vadose water migrate downward with the water; （3） mixture of chemical compositions occure while the water migrates downward in the vadose zone.