Browsing by Subject "Electromagnetic devices"
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Item Investigation of temporal variations in electromagnetic properties of soil(Texas Tech University, 2001-08) Gribenko, Alexander V.The purpose of this study was to determine if non-invasive electromagnetic methods could be calibrated to detect soil moisture variations in a field. Several electromagnetic methods were applied that are sensitive to a broad range of subsurface properties. By using several different geophysical tools we could determine which properties affect each method the most, and we could determine what properties of the soil were most affected by small changes in physical condition (e.g., water content, temperature, plant growth, etc.). We wanted to determine the most sensitive and cost effective methods to detect short-term changes in electromagnetic properties and therefore soil moisture. Before proceeding with the local survey that would be most sensitive to temporal variations in soil conditions we conducted a regional survey about the localized study area to determine if anomalous behavior would be of concern, and to have a better understanding of the study site. The regional survey was accomplished using an EM-34 electromagnetic device. We therefore wrote a program to invert these data for changes in soil properties. Detailed lithological data was available in this region, which was used to constrain the inversion of the EM34 data.