某污染场地土壤苯并(a)芘含量的三维估值及不确定性分析

污染场地修复前的准确评估是开展场地修复行动的基础和前提。建立了一套评估污染场地中污染土方量的三维插值方法,采用该方法模拟了某污染场地土壤苯并(a)芘(BaP)含量的空间分布并分析其不确定性。结果表明：场地地下环境中BaP含量数据服从对数正态分布,土壤中污染严重区域分别位于研究区的西南部和北部。通过普通克里格插值得到的BaP浓度超过0.4 mg·kg^-1的污染羽体积为14134 m³,对应的累积概率为0.585。依据给定变差范围值计算,得出现有收集数据对整个场地的描述程度为65%。基于该三维插值方法能准确地反映场地污染物空间分布特征,其不确定性分析可为补充采样布点及精准评估提供参考。

Uncertainty analysis and pollution volumetric calculation of soil BaP contents in a contaminated site

An accurate assessment prior to the contaminated site remediation is essential and pre-conditional to carry out a site remediation project. In this study, a system to calculate the pollution volumetric of BaP in a contaminated site based on three-dimensional interpolation is set up to simulate the spatial distribution of soil benzopyrene (BaP) and analyze its uncertainty. The results show that BaP content underground in the contaminated sites accords to the log normal distribution, while the southwest and north of the studied area was seriously polluted. By ordinary kriging interpolation, the volume of BaP plume concentration higher than 0.4 mg·kg^-1 was calculated to be 14134 m³ corresponding to the accumulation probability of 0.585. By variation range of values, the describing level of the existing data collected at the sites was calculated to be 65%. The spatial distribution features of the contaminations at the sites are thus accurately represented by this method with the uncertainty analysis served as reference for supplement sample stationing and precisely accurate evaluation.