Abstract
A transient, controlled-source electromagnetic survey has been performed at the Texas A&M University Hydrogeologic Field Site adjacent to the Brazes River in Burleson County, central Texas. The experiment is part of a larger, interdisciplinary effort to model the fate of agricultural chemicals applied to river floodplains. A regularized inversion of the electromagnetic data show that the sandy alluvial unit which constitutes the main aquifer for subsurface transport of groundwater is apparent as a resistive zone at depths between 5-20 m. We observe effects in the transient electromagnetic responses that are indicative of lateral heterogeneity and/or a polarizable Earth.
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