重金属污染场地电阻率法勘探的建模和仿真

Modeling and Simulation of Heavy Metal Contaminated Sites Survey Using DC Resistivity Method

为了提高对重金属污染场地的探测能力,分析了典型重金属污染场地的电阻率分布特征,建立了重金属污染场地的地电模型。利用有限元方法正演仿真了温纳和偶极对重金属污染场地的探测,得出视电阻率剖面图。结果显示两种装置对于污染区域的识别能力有所不同。温纳和偶极装置都反映出污染区域的水平位置,温纳装置对于污染区域的深度及形状反映优于偶极装置,偶极装置对于异常体差异性的反映优于温纳装置。仿真结果说明,显示电阻率与模型电阻率之间存在差异,对污染范围的精确判断需要做进一步数据处理。

In order to improve the detection of the resistivity method for heavy metal contaminated sites, we ana- lyzed the resistivity distribution characteristics of typical heavy metal contaminated sites and then established the geoe- lectric model of them. We simulated the DC resistivity survey with wenner and dipole-dipole arrays of heavy metal contaminated sites using the finite element method, and came to the apparent resistivity profiles. The results show that the two arrays have different abilities to identify contaminated areas. Both arrays reflect the horizontal position of the contaminated areas, and Wenner reflect the depth and shape of the contaminated areas better than dipole-dipole but dipole-dipole reflect the resistivity difference of the anomalous areas superior to the Wenner. The results also show that there are differences between the apparent resistivity profiles and the model of contaminated sites, so further data processing is necessary for accurately determine the scope of pollution.