基于三维空间插值技术的某场地中总石油烃污染分布确定

为了解总石油烃在场地中的扩散分布规律,立体呈现其污染分布特征,选择华北某污染场地为研究对象,分层采集土壤样品并采用三维空间插值软件EVS-Pro建立地质模型和污染插值模型,对C16总石油烃(脂肪族)(以下简称总石油烃)分布特征进行分析。结果表明:不同采样点位污染物浓度分布差异明显,总石油烃最高值是DB11/T 811—2011《场地土壤环境风险评价筛选值》的11.71倍;场地内污染物表现出较强的垂直和水平迁移能力,在空间中的迁移分布特征与生产历史状况、水文地质条件密切相关。研究表明,通过三维插值模型构建的插值结果可以更加直观地呈现污染分布,更好地反映各因素对总石油烃分布的影响。

Application of 3-D spatial interpolation technique to analyzing the distribution of TPH contamination in a field-site

The paper is aimed at introducing a kind of 3-D spatial interpolation technique to analyzing the distribution of TPH contamination in afield-site by using the interpolation software package known as EVS-Pro.To achieve the purpose,we have established the geological model and the interpolation model to reveal the distribution characteristics of TPH (total petroleum hydrocarbons,that is,aliphatic,＜ C16) in the nearby soils with the data of layered soil samples.The results of our analysis show that the variations of TPH samples among different soils have been found significantly different.In order to evaluate the diffusion and distribution status-in-situ of TPH,and disclose the characteristic features of the 3-D pollution distribution,we have chosen to investigate a contaminated site in North China and confirmed that the maximum concentration of TPH turns out to be 11.71 times as thick as the filter value in Screening Levels for Soil Environmental Risk Assessment of Sites (DB11/T 811-2011).Furthermore,we were informed that the detrimental pollution of the vertical and horizontal migration has been brought about due to the historical and hydrological conditions,such as,the location of the pollution leakage,the properties of the strata,and the presence of aquifer.The contamination leakage is likely to spread and sink-in significantly much deeper than the other contaminants in the vertical direction,for the second stratum with the thinner permeability and high content of the organic matters can be much more potential in absorption and retention of the contaminants into the other deeper layers.In the horizontal direction,it is the first layer of groundwater that serves as the main influential factors of the pollution migration,but the second layer has formed lenticular body which may impede the migration of TPH in the vertical direction.In addition,we have also found that the application of the software has been found more successfully than the two-dimensional interpolation software,because the longitudinal cross-sectional form can represent the relationship between the internal contamination and the stratum at the site.What is more,it is reported that the three-dimensional interpolation results constructed by the interpolation model can not only represent the distribution of the pollution more intuitively,but also better reveal the impact of the various factors on the distribution of TPH.Thus,it can be seen that the aforementioned spatial interpolation technique can be used for analyzing TPH distribution in sites,which can provide important reference for the subsequent exploitation and remediation of the polluted sites.