Abstract
A mathematical model is developed for a finite source that incorporates one-dimensional groundwater velocity, longitudinal and transverse dispersion, and some form of decay for either radionuclides or biodegradable organics. The model is employed in a calibration procedure that permits the determination of up to seven parameters from a known spatial distribution of concentrations. The determined parameters include the velocity of the contaminant, source size and concentration, and up to three dispersivities for a three dimensional problem. For a biodegradable organic, a combined parameter incorporates the ratio of velocity to a degradation half-life and is readily determined from the field data.
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