Laboratory analysis of field samples shows that the relative dielectric permittivity and dielectric loss tangent vary with frequency in wet soils. Frequency dependent electrical properties are seen in field data as attenuation and broadening or dispersion of a pulse. For this reason, our version 2.0 modeling program accepts frequency-dependent parameters and accounts for the pulsebroadening effects of dispersion. In some soils containing magnetic particles, the magnetic permeability is also modeled as a frequency dependent complex quantity. The model only allows zero-offset, one-dimensional data. Effects not considered are system noise, random near-field coupling changes, polarization artifacts, scattering losses, and higher-dimensional effects such as antenna pattern. The success of this method of subsurface characterization is strongly influenced by the user's understanding of the soil properties.


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