Abstract
An analytical framework is developed to represent the solute dispersion behaviour of a river whose local average velocity, flow rate and dispersion characteristics vary along its length. A coordinate transformation through which the concept of a dispersion coefficient is replaced by that of a characteristic time allows the use of dimensionless equations. By measuring concentration—time profiles at various stations downstream from a point where a slug of pollutant is instantaneously released it is possible to determine the variation of the characteristic time of the river along its length.
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