Abstract
The Hydrological Dispersion Module (HDM) of the RODOS (real-time on-line decision support) system for nuclear emergency management in Europe is under development at IMMSP Ukraine; at NRG, The Netherlands; at FZK, Germany; at SPA TYPHOON, , Russia; at IPEP, Minsk, Belarus, and NCSR Demokritos, Greece. Initial testing and customisation work was performed by NPPRI, Slovakia. The hydrological model chain of RODOS was outlined covering processes, such as runoff of radionuclides from watersheds following deposition from the atmosphere (RETRACE), transport of radionuclides in river systems (1-D model RTvTOX) and the radionuclide behaviour in lakes, reservoirs and estuaries (radioecological box model LAKECO, 2-D model COASTOX, and 3-D model THREETOX). The main aim of HDM is the prediction of the dispersion of radionuclides in aquatic systems following atmospheric fallout. HDM provides also the supplementary possibility to simulate the transport of radionuclide transport in aquatic systems following a direct release of radioactivity into the surface waters. In the RODOS system, the calculation results of HDM are transferred to both the aquatic food chain model (LAKECO) and to the dose module (FDMA) to assess the main exposure pathways. To apply HDM, the set of hydrological models have to be adapted together with the RODOS system taking into account the specific properties of the hydrological systems in the areas of interest
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