Modelling multiple dispersion of radionuclides through the environment

Title: Modelling multiple dispersion of radionuclides through the environment

Author: Monte, Luigi

Reference: Journal of Environmental Radioactivity, 101 (2), p.134-139, Feb 2010

DOI: 10.1016/j.jenvrad.2009.09.006

Keywords: Modelling; Contaminant migration; Multiple dispersion; Radionuclide migration through soil; Radionuclide migration from catchments

Abstract: The migration of a contaminant through the environment is the result of the transport by a variety of biotic and abiotic carriers which move according to different dispersion mechanisms. Consequently, the patterns of the distribution of a pollutant in the environment cannot be ever explained on the basis of a single migration process or assuming that the concentrations of contaminant in the different kinds of carriers quickly reach the equilibrium condition. The present work discusses two examples (wash-off from catchments and transport through soils of radionuclides) that clearly demonstrate the inadequacy of “single dispersion” models to predict these patterns. On the contrary, models based on multiple dispersion can successfully simulate the particular features of the above mentioned processes. It was demonstrated that the time behaviour of radionuclide migration rates from catchment of different rivers vary within small ranges as a consequence of multiple dispersion. This result can be useful for the development of generic predictive models.

URL: http://www.sciencedirect.com/science/article/pii/S0265931X09002203

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