Abstract
A tracer experiment using radioisotope was carried out to investigate the characteristics of a pollutant transport and to estimate the dispersion coefficients in a river system. A well-known radioisotope tracer technique was applied to measure the dispersion coefficients. The radioisotope Br in the form of aqueous ammonium bromide was used to estimate the flow patterns and dispersion phenomena in river. The radioisotope was instantaneously injected into a flow as a point source by an underwater glass-vial crusher. The dispersion coefficients are determined by moment method based on the measured radioisotope data. Two-dimensional numerical models were used to simulate the flow fields and the concentration distributions of the radioisotope injected into the river. The calculated results were compared with the measured ones. Trajectory model have been developed to estimate the unknown source position and the calculated results showed reasonable values within error range.
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