A physical model was built to study the relationship between fracture network characteristics and dispersion of solutes. The study was aimed at evaluating dispersion effects due to differences in the orientation of flow to the fracture network. Radial flow injection tests were conducted at three different flow rates (30, 60, 90 cm3/min.). Solute breakthrough was measured with specific conductance probes at 14 orientations to the major axis of the fracture network. Dispersivity coefficients were calculated from breakthrough curves.Results indicated calculated dispersivity coefficients increased with increasing flow rates and were affected by flow orientation to the orthogonal fracture network.

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