USGS Groundwater Information: Hydrogeophysics Branch
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THEORETICAL STUDY OF THE EFFECTS OF SURVEY GEOMETRY ON RADAR TOMOGRAPHY RESOLUTION
As part of OGW BG geophysical research through the USGS Toxic Substances Hydrology Program, research is being conducted to study the effects of survey geometry on borehole radar tomography resolution in order to develop or improve the tools available to the USGS for cross-hole radar data analysis.
The Branch of Geophysics is working with Dr. Fred Day-Lewis (Bucknell University) to develop and document computer programs that can be used by geophysicists in the USGS for analysis of radar tomography. These programs will perform several types of inversion of the radar tomography data, including the algebraic reconstruction technique (ART), simultaneous iterative reconstruction technique (SIRT), and weighted-damped least squares (WDLS).
The programs being developed and documented will also allow USGS geophysicists to evaluate the relative resolution of inverted borehole radar tomograms generated through different experimental designs. In addition, the study is looking at the limits of quantitative interpretation of borehole radar tomograms in cases where the resolution is too poor to allow for reliable statistical comparison between tomograms and borehole data.