Atmospheric transport of emissions over urban area sources

The method of variational imbedding has been applied in reducing the problem of solving the nonlinear partial differential equation governing steady-state, two-dimensional advective-diffusive transport of emissions from ground-based area sources to an equivalent initial value problem in ordinary differential equations. Picard's method has then been used to build up a sequence of successive approximations to density distribution of contaminants for the case when both turbulent diffusivity and mean downwind speed are taken to vary with the vertical distance coordinate according to the empirical power law. Solutions corresponding to a few simpler situations have also been presented in this paper.