摘要
采用T2VOC程序对重非水相液体(DNAPLs)在饱和介质中的迁移和分布特征进行了数值模拟.以一个夹粘土透镜体的砂层介质为例,采用三相毛管压力函数Parker模型和二相毛管压力vanGenuchten函数,对比细透镜体对重非水相液体运移的影响.进而探讨分析了三相毛管压力函数模型参数的敏感性.研究结果表明毛管压力函数的不同会影响DNAPLs的运移,Parker模型较van Genuchten模型所反映出介质对DNAPLs的阻滞和滞留作用更强.进气压力对非均质介质中DNAPLs入渗分布的饱和度将有显著的影响.对Parker模型中的nαw、n以及孔隙度和饱和渗透率的敏感性分析对比发现,敏感性程度的高低顺序依次是孔隙度>n>饱和渗透率>αnw.
This paper uses T2VOC code to simulate transportation of dense nonaqueous phase liquids （DNAPLs） in a saturated porous media. We take clay lenses embedded in a sand media as an example to compare the effects of clay lenses to DNAPLs transportation using the three-phase model of capillary pressure function （Parker model） or the two-phase van Genuchten function. Then we analyze the sensitivities of the parameters in the Parker model, in an attempt to reveal the most sensitive parameters controlling the transportations of DNAPLs. Our results show that different capillary pressure function affects the DNAPLs migration. The porous media arrests and blocks more DNAPI.s when using the Parker model. The inlet pressure has a significant impact on the DNAPLs saturation in a heterogenous media. The sensitivity analysis shows the importance of the four parameters in the order is porosity〉 n〉absolute permeability〉anw.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第3期299-307,共9页
Journal of Nanjing University（Natural Science）
基金
国家自然科学基金(40702037,40725010,41030746)
污染控制与资源化研究国家重点实验室开放基金(PCRRF09015)
