The method of combining physical model with mathematical model is described to study the concentration profile of pollutant dispersion in the Yangtze Estuary. Two contents are included, the experiment of jet in the tidal physical model and two-dimensional calculations of advection and diffusion using momentum and mass conservation equations of unsteady flow. The feature of dispersion in the tidal flow, which is different from that in the steady flow such as rivers, is explained. The capabilities of dillution and dispersion mainly depend on the volume of runoff and tidal range. Finally, the results of the measurement and calculation are presented, and it can be seen that they are in good agreement.
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