Abstract
By considering the impact of the walls, water surface and river bed in straight and rectangular cross-section channel and analyzing concentration distribution of instantaneous point source, diffusion characteristics of pollutant were obtained that: (1) the vertical front position of pollutant, zf, is proportional to 0.5 power of t; (2) the velocity of vertical front position, Vf, is inverse-proportion to the vertical front position, zf; (3) the vertical front position, zf, is proportional to the transverse front position, yf.
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