![]() An electromagnetic pulse is emitted from a transmitter antenna. Integration of GPR data with other surface geophysical methods, such as seismic, resistivity, or electromagnetic methods, reduces uncertainty in site characterization.įigure 1. As with most geophysical techniques, the results are non-unique and should be compared with direct physical evidence, such as trench or boring data ( Everett, 2013). High-frequency antennas (200-400 MHz range) can achieve resolutions of a few centimeters at shallow depths, while low-frequency antennas (50 MHz or less) may have a resolution of approximately one meter at greater depths ( Everett, 2013). Typically GPR is limited to depths of approximately 10 meters, but in highly resistive subsurface materials, such as salt or ice, depths of 100s of meters may be possible ( Everett, 2013). A GPR unit transmits electromagnetic energy into the ground which is reflected, refracted, or scattered back to the surface depending on the features it encounters (such as changes in geologic media or buried objects). Ground penetrating radar (GPR) is a shallow, high-resolution geophysical method that uses high-frequency, pulsed, electromagnetic waves to image the subsurface. Technical and Technology Support Services.Measurement and Monitoring Technologies for the 21st Century.Federal Remediation Technologies Roundtable.Triad: A Smarter Solution to Site Cleanup.High-Resolution Site Characterization (HRSC).Global Efforts to Advance Remediation at Contaminated Sites. ![]() Polycyclic Aromatic Hydrocarbons (PAHs).Per- and Polyfluoroalkyl Substances (PFAS).Dense Nonaqueous Phase Liquids (DNAPLs).
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