Importance Of The Process Of Mass-exchange
Between Main Stream Of A River And Underflow
For Modelling Of Concentration Of Radioactive
Substances In River Water And Bed Sediments
Author(s)
A. Krylov, A. Nossov, A. Kryshev, I. Kryshev & V. Kisselev
Abstract
Relatively simple compartmental models of transport of radioactive substances
by a uniform flow are quite often successfully used for assessment of
concentrations of radionuclides in water, bottom sediments and flood plains of
rivers. However, one should take into account specificity of contamination of a
river to be simulated. In this work the results of modelling of 89,90Sr, 137Cs, and
239,240Pu migration in the Techa River were compared with observed data. As a
result of the comparison the authors have supposed that taking into account of
the process of mass exchange between the main stream of a river and underflow
is important for the adequate modelling of migration and accumulation of
radionuclides (and other contaminants with similar physical and chemical
properties) in rivers that were polluted during a long period of time. It is known
that underflow of a river can reach 30% of the main stream. The performed
analysis of comparison of the modelling results with the observed data has
enabled an evaluation of numerical values of parameters by means of which the
interaction between the main stream and the underflow may be described. The
choice of the Techa-river as an example was not casual. For more than 50 years
the \“Mayak” plant was fulfilling its important defense mission and discharged
contaminated effluents to the Techa-river. As a result the whole river and its
basin have become contaminated by long-lived radionuclides. The issues of the
Techa-river contamination by radionuclides and simulation of their transport
have been given attention over decades by many scientists.
Keywords: water quality modelling, radioactive contamination, Techa, Mayak.
Keywords
water quality modelling, radioactive contamination, Techa, Mayak.
Related Book
Other papers in this volume
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