Conceptualization and Simulation of the Edwards Aquifer, San Antonio Region, Texas

Citation

Material Information

Title:
Conceptualization and Simulation of the Edwards Aquifer, San Antonio Region, Texas
Series Title:
10th Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst
Creator:
Lindgren, R. J.
Dutton, A. R.
Hovorka, S. D.
Worthington, S. R. H.
Painter, Scott
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Edwards Aquifer ( local )
Texas ( local )
Conceptualization ( local )
Network ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Numerical ground-water flow models for the Edwards aquifer in the San Antonio region of Texas generally have been based on a diffuse-flow conceptualization. That is, although conduits likely are present, the assumption is that flow in the aquifer predominantly is through a network of small fractures and openings sufficiently numerous that the aquifer can be considered a porous-media continuum at the regional scale. Whether flow through large fractures and conduits or diffuse flow predominates in the Edwards aquifer at the regional scale is an open question. A new numerical ground-water-flow model (Edwards aquifer model) that incorporates important components of the latest information and an alternate conceptualization of the Edwards aquifer was developed. The conceptualization upon which the Edwards aquifer model is based emphasizes conduit development and conduit flow, and the model can be considered a test of one of two reasonable conceptualizations. The model incorporates conduits simulated as generally continuously connected, one-cell-wide (1,320 feet) zones with very large hydraulic-conductivity values (as much as 300,000 feet per day). The locations of the conduits are based on a number of factors, including major potentiometric-surface troughs in the aquifer, the presence of sinking streams, geochemical information, and geologic structures (for example, faults and grabens). The model includes both the San Antonio and Barton Springs segments of the Edwards aquifer in the San Antonio region, Texas, and was calibrated for steady-state (1939–46) and transient (1947–2000) conditions. Transient simulations were conducted using monthly recharge and pumpage (withdrawals) data. The predominantly conduit-flow conceptualization incorporated in the Edwards aquifer model yielded a reasonably good match between measured and simulated hydraulic heads in the confined part of the aquifer and between measured and simulated springflows. The simulated directions of flow in the Edwards aquifer model are most strongly influence
Original Version:
10th Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst, Vol. 2004-5277 (2012-04-26).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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Aggregations:
University of South Florida
Karst Information Portal

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