石油污染组分在包气带土壤中运移的数值仿真模型及应用

基于多孔介质流体力学和溶质动力学理论，建立了石油组分在土壤包气带内传输的数值仿真模型，初步探讨了石油组分苯和正戊烷在土壤中的迁移归宿及在水相和气相中质量分配，预测预报石油污染物泄漏后在包气带内迁移转化的动态及过程。仿真结果表明：苯和正戊烷在水相和气相中的浓度分布规律几乎相同，随着时间的延长，污染面积和范围逐渐增大，并且释放在水相、气相中正戊烷的质量大于苯的质量。这不仅对于定量化研究有机污染物在地下环境系统中迁移归宿，环境质量评价及污染预测、预报与污染防治提供科学的理论根据与途径，而且可为地下环境系统中石油组分的质量监测以及地下水资源的开发利用和科学管理提供技术支持。

Numerical Simulation of Petroleum Components Transport in Unsaturated Zone and Its Application

The coupled dynamic model of the petroleum pollutant transport and migration in unsaturated zone was established based on the theory of porous media hydrodynamic and solute transport theory. The characteristic finite difference method and implicit pressure explicit saturation method were adopted to discrete the coupled model. The mass distribution of benzene and pentane in water and gas were discussed. The numerical model was utilized to predict the temporal and spatial distribution features of contaminant transportation and transformation in unsaturated soil. Numerical simulation results show the concentration distribution law of benzene is similar to pentane distribution law, the pollution range caused by petroleum pollutant leaching has a trend of increase with time, and the mass distribution of benzene released in the water and soil has larger than the mass distribution of pentane. It provides theory evidence for studying distribution and inclination of organic pollutant transport in subsurface environment, and the technology supporting are provided for petroleum components quality monitoring and groundwater resource exploitation.