＜正＞ - In this paper a two-dimensional unsteady shallow water equations and convection-diffusion equations have been considered to describe the diluting process of the radioactive and heat discharged from a nuclear power plant. The theory of characteristic and eccentric difference scheme has been used.In order to obtain the distribution of the concentration in far-field and near-field, three different siges of mesh have been used. The flow field has been verified with the field data, and the computed temperature in the near-field agrees with the measurements in the normal physical model test.
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