包气带粘性土层的防污性能试验研究及其对地下水脆弱性评价的影响

Experimental Studies of the Filtration Capability of Clayey Soils in the VadoseZoneand Its Influence on the Evaluation of Groundwater Vulnerability to Pollution

大量文献资料分析表明,平原地区地下水脆弱性主控因素为地下水位埋深、包气带土层及其特征,而包气带粘性土层的截污性能及其厚度则又是脆弱性主要的影响因子。试验研究结果显示,粘性土的截污容量大小可以通过模拟淋滤实验测试得出,有效阻隔足额厚度也可计算得出。根据不同粘性土层的截污容量、有效阻隔厚度等,可以评判土层的污染防护能力,并可据此评价平原区地下水的脆弱性。

An analysis of large quantities of information shows that main factors affecting groundwater vulnerability to pollution in the plain area are water_table depth, soil media, vadosezone bed and its characteristics, and that, of these factors in the vadose zone, the filtration capability of clayey soils is most important. It is demonstrated that the filtration capability of clayey soils can be obtained by leaching experiments and calculation, and that the adequate thickness of effective clayey soils can also be figured out. The capability for polluted groundwater consists of filtration capability and adequate thickness of effective clayey soils in the vadose zone. Groundwater vulnerability to pollution in the plain area may be evaluated by means of filtration capability and adequacy thickness.