Abstract
A transient controlled-source electromagnetic (TDEM) survey has been performed at the Texas A&M University Hydrogeological Test Site adjacent to the Brazos River in Burleson County, Texas. A 1-D regularized inversion of the data shows that a sandy, unconsolidated alluvial unit which constitutes the main aquifer for subsurface transport of groundwater is apparent as a resistive zone at depths between 5-20 m. The TDEM survey was conducted as part of a larger, interdisciplinary effort by agricultural engineers, environmental geochemists and geophysicists to characterize nonpoint-source contaminant transport at the test site. The electromagnetic data provides information about fluid and contaminant pathways and impermeable clay and/or shale zones.
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