Early development of karst aquifers on percolation networks of fractures in limestone.

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Material Information

Title:
Early development of karst aquifers on percolation networks of fractures in limestone.
Series Title:
Water Resources Research
Creator:
Siemers, Jörg
Dreybrodt, Wolfgang
Publisher:
John Wiley and Sons
Publication Date:
Language:
English

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Genre:
serial ( sobekcm )

Notes

Abstract:
We have modeled flow and dissolution processes within percolation networks representing stochastic primary fracture systems in limestone. At the beginning of karstification, flow is evenly distributed on all fractures available. As the system develops by dissolutional widening of the fractures, preferred flow pathways evolve, which attract more and more flow, until at breakthrough the total flow rate increases dramatically. These breakthrough times have been investigated with regard to their dependence on the initial fracture aperture width, the dimension of the evolving karst aquifer, hydraulic gradients, connectivity of the percolation network, and the chemical parameters, such as higher‐order rate constants and exponents, and equilibrium concentration. They exhibit a behavior similar to that of breakthrough times for one‐dimensional conduits [Dreybrodt, 1996]. Our results show that the structure of the evolving karst aquifer is determined by the initial geological setting. However, the final conduits are selected from competing pathways with potential breakthrough times close to each other, whereby the details of the distribution of undersaturation with respect to calcite play an important role.
Original Version:
Water Resources Research, Vol. 34, no. 3 (1998-03-01).

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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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