Abstract
Laboratory tracer experiments are implemented in homogeneous flow field under saturated steady flow condition with a pulse source. Application of dye tracer with Brilliant Blue FCF is allowed to visualize solute behavior and to obtain the images of plume evolution. Through an image processing, spatial concentration distributions of dye tracer with 0.125, 0.250 and 0.500 of initial concentration as well as plume outlines are extracted to ensure the further development of parameter identification. Based on these image data, an image analysis with plume outline and a spatial moment analysis linked with extracted concentration distributions are applied to the estimation of longitudinal and transverse dispersivites. Results show that spatial moment analysis provides an adequate estimate of dispersivities as compared to the image analysis, indicating the improvement of estimation accuracy. Whereas estimates using spatial moment analysis depend on the number of spatial concentration contours, spatial moment analysis represents a potentially useful alternative for estimating longitudinal and transverse dispersivities.
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