时/频域激电参数在铬污染模拟场地探测中的应用  

Time-Frequency Domain Induced Polarization Parameters Applied on Chromium Pollution Simulation Survey Site

作　　者：陆晓春 能昌信[2] 朱勇[3] 郑晓旭 郑晓雯 

机构地区：[1]上海申丰地质新技术应用研究所有限公司,上海201702 [2]中国环境科学研究院固体废物污染控制技术研究所,北京100012 [3]阜阳师范学院物理与电子科学学院,安徽阜阳236041 [4]四川省冶金地质调查局六0五大队,四川眉山620860

出　　处：《环境科学研究》2015年第3期481-486,共6页Research of Environmental Sciences

基　　金：国家高技术研究发展计划(863)项目(2009AA063101-2)

摘　　要：在低供电频率（2^-4、2^-2、2^0、2^2、2^4Hz）范围内,利用研发的时/频域测量系统,在室外铬污染模拟场地进行时/频域激电探测,实测视电阻率、视极化率、相角,结合最小二乘反演算法,研究各参数对铬污染低阻异常区域及其对铬浓度（以w计）差的体现.结果显示,视电阻率和视极化率随着铬浓度差的增加而迅速减小,视电阻率从背景值的80Ω·m左右减至50Ω·m以下,视极化率从背景值3.0%~3.8%减至0.6%~2.2%;在不同的供电频率下,相角对含水率和铬浓度差的体现有所差异.试验数据还显示,当供电频率从2-4Hz增至24Hz时,实测相角数值较为平均,但是经过最小二乘反演后,相角上限从6.27°减至1.75°.研究结果说明,单纯的时域参数（视电阻率和视极化率）很难区分含水率和铬浓度差引起的低阻异常,但供电频率在2-2~20Hz范围内时,频域参数相角可以区分含水率和铬浓度差引起的低阻异常.This research studied the effects of time-frequency domain induced polarization applied on a chromium pollution simulation site survey.Combined with the least squares inversion algorithm,resistivity,polarizability and phase angle can be measured by time-frequency domain IP measurements to research the phenomenon of various parameters on chromium contamination of low resistivity anomaly area and concentration differences of chromium（ using w as the abbreviation） pollution within low frequency ranges（ 2-4,2-2,20,22,24Hz）.Resistivity and polarization decreased fast as w（ chromium） increased.Resistivity decreased from 80 Ω·m to 50 Ω·m or less and polarizability was reduced from 3.0%-3.8% to 0.6%-2.2%.At different frequencies,the phase angle reflected differently in water content and w（ chromium）.Experimental data showed that as the supply frequency increased from 2-4Hz to 24 Hz,the measured phase angle values were more even.However,after the data were processed through the least squares inversion,the phase angle was reduced from 6.27° to 1.75°.The results show that the pure time-domain parameters（ resistivity and polarizability） are difficult to distinguish the low-resistivity anomaly caused by moisture content or concentration differences of chromium.However,if supply frequency is within the range of 2-2-20 Hz, frequency-domain parameters（ phase angle） can distinguish the different concentrations of chromium contamination,which causes low resistivity anomaly.

关 键 词：时间域 频率域 激电参数 电法勘探 模拟场地 

分 类 号：X143[环境科学与工程—环境科学]