NEW PERSPECTIVE ON THE CONVECTION-DIFFUSION-DISPERSION EQUATION

The coefficients of the dimensionless partial differential equation of convection-diffusion-dispersion of flood waves are shown to be functi ons of the Froude and Vedernikov numbers only. The Froude number is th e ratio of mean velocity to relative dynamic wave celerity. The Vedern ikov number is the ratio of relative kinematic wave celerity to relati ve dynamic wave celerity. The third-order convection-diffusion-dispers ion equation can be used to analyze flood propagation problems where b oth diffusion and dispersion are deemed to be significant.