AKİFER KİRLİLİĞİNİN VE TEMİZLENME SÜRECİNİN JEOFİZİK VE JEOKİMYASAL YÖNTEMLERLE İZLENMESİ


PEKŞEN E. (Executive), KAPLANVURAL İ., AKYOL N. H., DURDAĞ D.

Project Supported by Higher Education Institutions, 2019 - 2022

  • Project Type: Project Supported by Higher Education Institutions
  • Begin Date: June 2019
  • End Date: September 2022

Project Abstract

Dense non-aqueous phase liquids (DNAPL) are a major problem for groundwater. Trichloroethylene (TCE) in groundwater aquifer system is one of the most observed DNAPL examples; pose a serious threat to human health because of the carcinogenic effect. Surface active aquifer remediation (SEAR) is an important technique to control and remediate such pollutant in groundwater aquifer system. In this project, monitoring the behavior of TCE and mass displacement with SEAR process in aquifer system using ground penetrating radar (GPR) and direct resistivity current (DRC) method were applied.

An aquifer model was built to perform for three-dimensional set of experiments. Contamination and remediation process was carried out in a laboratory scale. All phase change and mass displacement that occurred in this laboratory scale aquifer model to monitor with GPR and DRC methods. In addition to geophysical measurements, the result of samples was taken directly from the aquifer system for comparison. The conductivity of the region increases because of chemical reactions between solvent and pollutant in the process of cleaning the aquifer. The GPR signal is types of electromagnetic waves, thus the depth of penetration is decreased in a conductive medium. Therefore, in addition to the GPR method, DRC method was applied on the model scale. Multi-electrode DCR (or Electrical Resistivity Tomography (ERT)) method was installed on a plexiglass model. Potential and current electrodes were small. A 2D inverse program was performed to obtain resistivity depth sections from measurement. 

In this project, DNAPL and DNAPL phase behavior in the aquifer system were monitored at the laboratory. Time-lapse GPR data was acquired on the top of the aquifer system. We applied standard data processing steps to the GPR data such as background removal, filters, NMO, gain, migration, etc. To monitor at a high resolution of detail of DNAPL and DNAPL phase in groundwater aquifer system is very important task.