基于高密度电阻率成像法的轻非水相液体饱和度的确定  

Determination of saturation distribution of light non-aqueous phase liquid based on electric resistivity tomography

作　　者：刘汉乐[1] 周启友[1] 吴华桥[1] 

机构地区：[1]南京大学地球科学系

出　　处：《水利学报》2008年第2期189-195,共7页Journal of Hydraulic Engineering

基　　金：教育部博士点基金(20060284015);国家自然科学基金(40371021)

摘　　要：通过采用高密度电阻率成像法确定三维空间轻非水相液体的饱和度分布。首先,在三维砂槽上进行轻非水相液体的入渗试验,利用高密度电阻率成像法进行动态监测,在采集电压电流数据后,反演计算获取该三维空间电阻率的分布。然后利用Archie公式将三维空间的电阻率转换成轻非水相液体的饱和度。根据不同时间的饱和度的分布估算出不同时间轻非水相液体的入渗量,并与实测的入渗量进行了对比。结果表明,得到的轻非水相液体入渗量的估算值与实测值非常吻合,表明利用高密度电阻率成像法获取三维空间轻非水相液体饱和度的分布是可行的。The electric resistivity tomography was applied to determine the 3-D saturation distribution of light non-aqueous phase liquid （LNAPL）, The infiltration experiment was carried out in a flume with sand adopted as porous media and the dynamic process of infiltration was monitored using high density electric resistivity tomography, by which the 3-D distribution of electric resistivity was inversely calculated from the data of voltage and current distribution, On this basis, the distribution of LNAPL saturation can be calculated according to the Arehie formula for transforming the electric resistivity into saturation, The infiltration flow of LNAPL at different moments was estimated from the saturation distribution and was compared with the measured discharge, The result shows that the estimated infiltration flow is in good agreement with the measured discharge, It indicates that the electric resistivity tomography is a feasible method for determining the saturation distribution of LNAPL.

关 键 词：Archie公式 多孔介质 轻非水相液体 饱和度 高密度电阻率成像法 

分 类 号：X830[环境科学与工程—环境工程]