Dr. Sarabudak describes resistivity imaging and natural potential data (NP) collected over six caves between the years of 2000 and 2014, which are air filled and are located in the northern part of Bexar County, San Antonio, and in the south and north of Travis County, Austin, Texas. All caves were encountered through drilling and/or excavation for construction and utility lines or power pole reconstructions. The study area falls into the part of the Recharge Zone of the Edwards Aquifer region and it represents a well-developed karstified and faulted limestone.
The resistivity and NP data over these 6 caves suggest that the resistivity data does not specifically determine where karstic features are located in the subsurface. However, it provides significant information on the near-surface geology and geological structure. The NP data, on the other hand, notably defines the location of cave features. Thus the merits of integrating the NP method along with the resistivity imaging over the Edwards Aquifer, in order to reduce the ambiguity in the interpretation, are evident.
It is clear from the ongoing discussion above that the 2-D resistivity data does not specifically determine where karstic features are located in the subsurface. However, it provides significant information on the near-surface geology and geological structure. In addition, the combination of 2D and 3D resistivity measurements illustrates the subsurface conditions in a sufficiently accurate manner as shown in the discussion on the Cave 1 case study.
The NP data, on the other hand, notably defines the location of karstic features. Thus the merits of integrating NP method along with the resistivity imaging, in order to reduce the ambiguity in the interpretation, are evident. The best methods are the natural potential and resistivity techniques over the Edwards Aquifer.
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