Inverse problems of estimating radioactive impurities of the Enisei river basin

When handling and interpreting results of experimental studying radioactive impurities of rivers using methods of formulation of both direct and inverse problems as related to impurities transport, there can arise essential difficulties associated with inadequacy of mathematical models used to available observations data. With direct modeling of radionuclides in a river bed, it is necessary to set a large number of hydrological parameters, characteristics of nuclide distribution in the systems "water-suspension" and "water-bottom sedimentation", etc. Eventually, all the above-said can essentially narrow down the areas of application of these models in spite of their rather a universal nature [1]. When using statements of inverse problems, it is undesirable to describe in great detail the migration processes of radionuclides, because this can cause serious difficulties of their substantiation and numerical realization.