Karst aquifer evolution in fractured, porous rock.
- Permanent Link:
- Karst aquifer evolution in fractured, porous rock.
- Series Title:
- Water Resources Research
- Kaufmann, George
- American Geophysical Union
- Publication Date:
- serial ( sobekcm )
- The evolution of flow in a fractured, porous karst aquifer is studied by means of the finite element method on a twoâ€dimensional mesh of irregularly spaced nodal points. Flow within the karst aquifer is driven by surface recharge from the entire region, simulating a precipitation pattern, and is directed toward an entrenched river as a base level. During the early phase of karstification both the permeable rock matrix, modeled as triangular elements, and fractures within the rock matrix, modeled as linear elements, carry the flow. As the fractures are enlarged with time by chemical dissolution within the system calciteâ€“carbon dioxideâ€“water, flow becomes more confined to the fractures. This selective enlargement of fractures increases the fracture conductivity by several orders of magnitude during the early phase of karstification. Thus flow characteristics change from more homogeneous, poreâ€controlled flow to strongly heterogeneous, fractureâ€controlled flow. We study several scenarios for pure limestone aquifers, mixed sandstoneâ€limestone aquifers, and various surface recharge conditions as well as the effect of faulting on the aquifer evolution. Our results are sensitive to initial fracture width, faulting of the region, and recharge rate.
- Original Version:
- Water Resources Research, Vol. 36, no. 6 (2000-02-01).
- 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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