Effects of remediation reagents and rainfall on self-potential signals: A case study

Yung Chieh Chuang, Chien Chih Chen, Tzu Pin Wang, Tien Hsing Tung, Yao Tsung Chen, Su Tien Lin, Ching Jen Ho

研究成果: 雜誌貢獻期刊論文同行評審


In this study, the self-potential (SP) method was used for the continuous monitoring of naturally occurring electric potential differences at a soil and groundwater contamination site in Southern Taiwan from August to October 2015. At this field site, we set two perpendicular survey lines with 25 potential electrodes for daily measurements. The hourly SP medians of each day were averaged for the inversion of the 85-m long north-south (line I) and 35-m-long west-east (line II) SP tomographies (SPTs). The results are as follows: First, the regional groundwater flow direction was found to be in the north-northeast direction according to the distribution of electric potentials in the SPTs. The rainfall effects and consequent SP response were analyzed, which revealed enhanced regional positive and negative potentials in the SPTs, with a strength of up to -100 mV. In addition, effects of remediation reagent injection were monitored from 13 to 18 October; the results showed increased local potential in the two SPTs. Finally, we assessed the movement of the isopotential lines within a specific distance and determined the apparent velocity of groundwater to be 3.24 ± 0.38 and 0.57 ± 0.08 m day-1 through the dissipation of rainfall effects and local potential increases because of the injection.

頁(從 - 到)437-451
期刊Terrestrial, Atmospheric and Oceanic Sciences
出版狀態已出版 - 2020


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