污染物在下包气带非饱水条件下迁移转化的研究

Research on Transport and Transformation of Contaminants in the Unsaturated Vadose Water Zone

一、前言 城市污水施于农田,其中的污染物可能潜入地下水中造成危害,为了控制这种现象的发生,有必要开展污染物在地下包括下包气带的迁移转化规律研究,以供制订有关标准的依据。

The potential impact of contaminants on groundwater through transporting in unsaturated vadose zone was studied in this paper. By means of theoretical analysis, the methematical functions of convection, dispersion and ad-sorption-desorption processes of pollutants were touched-The main attention was paid to the permeability of tilling layer, plough pan and lower aeration zone. The plough pan was rcfcred to the controlling layer of water permeation in terms of the measurement results of samples. The soil-water characteristic curves of three typical Soils (fine silt, silt and very fine sand) were made out. The parameters for unsaturated hydraulic conductivity of loam was obtained through curve fitting. Compared with that of foreign scholars. The results were considered practicable. Furthermore, the transport and transformation of pollutants presented by tritium (tritiated water) were researched in an unsaturated column.