Research Information System
PEKŞEN E. (Executive), KAPLANVURAL İ., AKYOL N. H., DURDAĞ D.
Project Supported by Higher Education Institutions, 2019 - 2022
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.