Theoretical analysis of pollutant mixing zone considering lateral distribution of flow velocity and diffusion coefficient.

摘要: Theoretical formulae have shown significant advantages in describing the characteristic geometric scales of pollutant mixing zone (PMZ) formed by offshore discharged a single general form. They, however, fail to predict influence lateral inhomogeneity river flow because constant velocity and diffusion coefficient are assumed during derivation. The realistic is fitted an exponential law this study proposed same Similar idea has been used previous studies on vertical dispersion scalar lower atmosphere. Pollutant from steady onshore point source into wide straight open channel examined characterize concentration taking consideration these variations. maximum length, width its corresponding longitudinal position, as well area PMZ derived. A non-dimensional standard curve equation for isoconcentration boundary also obtained. results show that shape dimensionless depends only constants laws. profiles fit near-shore give good prediction, while ones match entire range up center underpredict significantly. These findings great importance practitioners geometry rivers water quality modeling.