Image Analysis for Determination of Dye Tracer Concentrations in Sand Columns
1997
Aeby, P. | Forrer, J. | Flühler, H. | Steinmeier, C.
Dye tracers can be used to visualize flow paths in soils. We used digital image analysis to determine the spatial distribution of dye concentrations in a quartz sand column. Color slides and near-infrared black-and-white photographs were taken from a sand column that was cut in halves longitudinally after a point-source dye infiltration experiment. In a separate calibration experiment, sand samples were prepared with known water content and dye concentration. Photographs of such sample arrays were used as training areas for image analysis. Image analysis is a viable way for obtaining a high spatial resolution of tracer concentrations and provides a quantitative basis for describing different solute mixing regimes.
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