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Application of PSTM on GPR Data for NAPL Contamination Detection
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics, Sep 2014, Volume 2014, p.1 - 5
Abstract
Ground penetrating radar can be considered as a non – invasive geophysical method and it can be used to examine contaminated site. Multi-offset GPR measurements are used in order to locate the LNAPL plume. Because there are many similarities between GPR time sections and seismic reflection profiles, seismic reflection processing and imaging methods can be applied on multi-offset GPR data. After applying processing steps such as band pass filtering, deconvolution, gain recovery, AGC, estimation of velocity using sembalance velocity analysis and making stacking section, it can be observed, but subsurface stratigraphy and exact location of the LNAPL plume are unknown. Therefore we used seismic Kirchohoff prestack time migration on multi-offset GPR data. After applying Kirchohoff prestack time migration subsurface stratigraphy and the contaminated site has been exhibited with more clearance and the exact location and the improvement of the contaminated site is characterized by collapsing of the hyperbolas. Also another layer, which is not seen in the before migrated stacked section, is observed beneath of the water table.