Hydrogeological Property Estimation Using Tomographic Data At The Boise Hydrogeophysical Research Site

Crosswell seismic and radar data were acquired at the Boise Hydrogeophysical Research<br>Site (BHRS) as part of an effort to characterize the hydrological property distribution in a<br>heterogeneous alluvial aquifer. The dielectric constant and amplitude attenuation values<br>obtained from inversion of the radar data, as well as the seismic P-wave velocity values<br>obtained from inversion of the seismic data, reveal similar spatial patterns. Comparison of<br>this tomographic information with coincident wellbore logs suggest that the geophysical<br>attributes are sensitive to hydrogeological variations. Information obtained from the radar<br>tomography data were used to produce 2-D, high-resolution images of porosity and electrical<br>conductivity. Comparison of these images with coincident log data reveal that these estimates<br>are reasonable and suggests that the tomography data will be useful at this site for delineating<br>variations in hydrological parameters.