Abstract
A stream-tube dispersion model used in an engineering study has been calibrated using on-site dye measurements. The feasibility of model construction using non-specialized data is demonstrated through detailed description of the study and its discretization. The model was used to plan a field study in which measurements of tracer diffusion from a continuous source were supplemented by detailed velocity and depth observations. After a preliminary calibration of bed roughness to reproduce observed velocities, transverse mixing coefficients were adjusted to obtain good reproduction of the tracer measurements. The adjusted nondimensional coefficients are so large as to suggest that secondary currents play an important role in transverse mixing, weakening the generality of the calibration and pointing out the need to account for secondary circulation explicitly.
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