Longitudinal transport of harmful impurities by river flow

A mathematical model of the longitudinal transport of radioactive impuritie s by a uniform river flow taking account of the vertical migration in river bottom deposits, is described. A specific example is examined, The calcula tion is performed by solving the appropriate boundary value problem numeric ally on a personal computer The comparison of the computational results and the results of natural observations showed that the migration of the conta mination in bottom deposits can be decisive for the propagation of radioact ive impurities in a river channel. 3 figures, 5 references.