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Tracer transport between two points in fractured medium is by way of a number of such channels. Tracer breakthrough curves display features that correspond well with data reported by Moreno et al. [1985], which lends support to the validity of this model. Figure 30. (a) Schematic diagram of the channel representation of fluid flow in a single fracture, and (b) Schematic sketch showing parameters for one channel [after Y. -F. Tsang, 1987]. Moreno et al. [1988] extended this work by investigating 2-D flow in a single fracture that was discretized into a square mesh.

Therefore, such results may provide a poor representation of system behavior. On the other hand, spatially integrated quantities average out the variability, providing more stable results and a better representation of the average system behavior. In this stochastic model, Y. Tsang et al. [1996] accounted for the fractures by assigning a long-range correlation structure, in the preferred orientation of the fracture zones, to a small fraction (approximately 11%) of the highest hydraulic conductivities.

INVESTIGATIONS AT BERKELEY ON FRACTURE FLOW IN ROCKS 2-k 3! c a. a) a •Vertical Joints Horizontal fractures 6 Central Fracture Zone 8 + Rubble Zone 10 I Dead-end fractures 12 -L Plate 9. A conceptual tree-type model for the fracture pattern and fracture connectivity in a basalt flow. Locations for nonconductive fractures are arbitrary [after Faybishenko et ai, 1999a]. distance (m) 1 2 3 vesicular layer single fracture 3 fracture zone vesicular layer vesicular layer vesicular layer 7 fracture zone 8 9 10 rubble zone 90 95 Velocity (m/hr) Plate 10.

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