Numerical analysis and centrifugal modeling of LNAPLs transport in subsurface system  

作　　者：HU Liming LOI. M. C. MEEGODA J. N. 

机构地区：[1]Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China [2]Department of Civil Engineering, Hong Kong University of Science and Technology, Hong Kong SAR, China [3]Department of Civil and Environmental Engineering, New Jersey Institute of Technology, USA

出　　处：《Progress in Natural Science:Materials International》2006年第4期416-424,共9页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant No.50209006)European Community Asia-Link Programme (Contract No-CN/ASIA-LINK/010 94-556)the Tsinghua Basic Research Fund

摘　　要：The transport of non-aqueous phase liquids （NAPLs） in unsaturated Mils and groundwater is an important research topic in geo-environmental engineering. In this paper, the mechanism of light NAPLs （LNAPLs） transport in subsurface system is briefly introduced, and the mass transport equations, fluid flow equations, and the constitutive model of relative permeability saturation capillary pressure are discussed. Then the numerical method is introduced to simulate the multiphase flow problems in porous media, and the tempospatial distribution of LNAPLs is obtained. Moreover, different boundary conditions are employed in numerical simulation to investigate its effect on transport behavior. To verify the numerical data, centrifugal tests are conducted to model the LNAPI.s migration in unsaturated soils and groundwater. The calculation results are agreeable with the experimental findings of centrifugal modeling, which indicates that LNAPLs from leaking point move downwards due to gravity force, and form a high concentration zone above the capillary fringe, and then spread out laterally along the groundwater table. Some LNAPL enters groundwater system to further migrate. The combination of numerical simulation and centrifuge modeling can be a useful means to study tbe transport behavior of LNAPLs in subsurface system.在不饱和的土壤和地下水的非水的阶段液体(NAPL ) 的运输是在 geo 环境的工程的一个重要研究话题。在这篇论文，在表面下的系统的轻 NAPL (LNAPL ) 运输的机制简短被介绍，并且集体运输方程，液体流动方程，和相对渗透的组成的模型 - 浸透 - 毛状的压力被讨论。然后，数字方法被介绍在多孔的媒介模仿多相的流动问题，并且 LNAPL 的速度空间的分发被获得。而且，不同边界条件在数字模拟被采用在运输行为上调查它的效果。验证数字数据，离心的测试被进行为 LNAPL 建模，在不饱和的土壤和地下水的移植。计算结果与离心的建模的试验性的调查结果是令人喜悦的的，它显示从漏的 LNAPL 由于严肃力量向下削尖行动，并且在毛状的穗上面形成一个高集中地区，然后沿着地下水表格旁边地展开。一些 LNAPL 进入地下水系统进一步移居。当模特儿的数字模拟和离心机的联合能是一个有用工具在表面下的系统学习 LNAPL 的运输行为。

关 键 词：geo-environmental engineering subsurface contamination multiphase flow light non-aqueous phase liquids（LNAPLs） centrifugal modeling technique numerical simulation. 

分 类 号：X51[环境科学与工程—环境工程]