Open AccessHigh Frequency Electromagnetic Impedance Imaging for Vadose Zone and Groundwater Characterization
Author(s) -
Greory A Newman,
David Alumbaugh,
Michael Hoversten,
E. H. Nichols
Publication year - 2003
Language(s) - English
Resource type - Reports
DOI - 10.2172/811869
Subject(s) - vadose zone , geology , ground penetrating radar , magnetotellurics , geophysics , groundwater , geotechnical engineering , radar , electrical resistivity and conductivity , engineering , telecommunications , electrical engineering
A geophysical experiment is described for characterizing the clastic dike systems, which are ubiquitous within the vadose zone at the Hanford Nuclear Reservation. because the dikes possess a significant electrical contrast from the insulating host medium, we have applied controlled source audio magnetotelluric (CSAMT) measurements to map their geometric extent and to further clarify if the dike complex acts as a conduit for contaminant transport within the vadose zone. Because of cost and weak natural field signal levels, we employed controlled field sourcing using the STRATGEM acquisition system. Use of artificial fields often goes with the assumption that the data required in the far-field of the transmitter