电法监测城市浅层地下水污染可行性研究  

Feasibility study on electrical method for monitoring shallow groundwater pollution in cities

作　　者：崔少北 李晓斌 杨双安[1] CUI Shaobei;LI Xiaobin;YANG Shaungan(School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Province, Jiaozuo 454000, China)

机构地区：[1]河南理工大学资源环境学院,焦作454000 [2]中原经济煤层(页岩)气河南省协同创新中心,焦作454000

出　　处：《物探化探计算技术》2020年第2期267-276,共10页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金资助项目(41772375);河南省自然科学基金资助项目(182300410006);河南省教育厅基础研究计划(14A440009)。

摘　　要：为比较点电极与长电极电源在监测城市浅层地下水污染状况方面的优劣,这里依据城市浅层地下水赋存特征,设计了圆饼状、条带状、球状三种地质模型,采用非结构多重网格有限元方法模拟地下水污染前后的地电场差异。研究表明,在相同的激励电压下,点电极电位值较小,电场扰动出现在水体污染区域附近,且地下水被污染后地表电位值变小,电位差异微弱;长电极能够将更多电流传至污染水体和深部地层,形成电场强度更大,污染水体对电场的扰动范围扩大,电位值变大,电位差异显著。因此,长电极电法监测在城市浅层地下水污染预警方面具有潜在发展前景。In order to compare the advantages and disadvantages of point electrode and long electrode power source in monitoring shallow groundwater pollution in urban areas,three kinds of geological models are designed in this study,including round cake,strip and sphere according to the characteristics of shallow groundwater in cities.The multigrid finite element method simulates the difference in geoelectric field before and after groundwater pollution.Studies have shown that under the same excitation voltage,the potential of the point electrode is small,the electric field disturbance occurs near the water pollution area,and the surface potential value becomes smaller after the groundwater is contaminated,and the potential difference is weak.The long electrode can transmit more current to the polluted water body and the deep stratum,and the electric field intensity is larger.The disturbance range of the polluted water body to the electric field is expanded,the potential value becomes larger,and the potential difference is significant.Therefore,long-electrode electrical monitoring has potential development prospects in urban shallow groundwater pollution warning.

关 键 词：浅层地下水 污染监测 长电极电源 有限元数值模拟 电法监测 

分 类 号：P631.3[天文地球—地质矿产勘探]