Abstract
Dispersion experiments using a sandbox model are conducted in either one or two dimensions to simulate the movement of pollutants in groundwater. One-dimensional experiments are performed to show the dispersive characteristics of contaminants in a porous medium and to calculate the longitudinal dispersion coefficient. A literature review reveals there have been few data published on one-dimensional-column dispersion experiments, especially by using dyes as tracers. Neither are there any data available for columns of crushed glass grains with a downward gravitational flow. Hence, a one-dimensional optically scanned column experiment to study the dispersion phenomenon in porous media has been conducted. A rectangular column (119 × 18.3 × 2 cm) filled with crushed glass with grain sizes between #40- and #20- and a Rhodamine B solution (500 ppm) is used. Average downward fluid velocity is 0.41 cm/sec. Photoelectric cells are used to measure changes in tracer concentration. The change of relative concentration...
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