Mathematical modeling of radionuclide dispersion in the Pripyat-Dnieper aquatic system after the Chernobyl accident

Hydrological dispersion module of JRODOS: renewed chain of the emergency response models of radionuclide dispersion through watersheds and rivers

“…COASTOX_UN is new more computationally efficient version of COASTOX code (Zheleznyak et al, 1992;Monte et al, 2006) that includes two-dimensional (depth averaged) model of open flow hydrodynamics, the submodels of the suspended sediment and radionuclide transport is shallow water bodies. The numerical solution of the COASTOX_UN is based on the descretization of the shallow water equations of the open flow hydrodynamics and 2D equations of advective-diffusive transport of suspended sediment and radionuclides on the unstructured triangular grid by the finite volume method.…”

Hydrological dispersion module of JRODOS: development and pilot implementation – the vistula river basin

“…• radionuclide washout from watersheds to a river network by rainfall generated runoff (box model RETRACE) (Kolomeev and Madsen, 2002); • radionuclide transport in rivers in solute, attached to suspended sediments and in the in river bed, simulated on the basis of the pre-calculated flow and sediment dynamics in river networks (one-dimensional model RIVTOX) (Zheleznyak et al, 1993;Johannessen et al, 2010); • radionuclide transport in river floodplains, shallow reservoirs, lakes and coastal areas in solute, attached to suspended sediments and in the bottom sediments simulated on the basis of the pre-calculated 2D flow and sediment concentrations fields (two-dimensional model COASTOX) (Zheleznyak et al, 1992;Monte et al, 2006); • radionuclide transport in deep stratified lakes and reservoirs, estuaries based on the simulation of the 3D flow and the suspended sediments (3D model THREETOX) (Margvelashvili et al, 1997;Johannessen et al, 2010); • radionuclide migration in the marine foodchain (box model POSEIDON) (Lepicard et al, 2004); • internal and external doses exposed via aquatic foodchain and dose pathways (model FDMA) (Gering et al, 2003);…”

Comparative analyses of different modelling approaches to simulate radionuclide transport through the Dnieper reservoirs based on extremal flood 1999 scenario

“…At the end of 80-s in early 90-s the detailed studies of the water systems around the Chernobyl Nuclear Power Plant (NPP) have shown [1][2][3][4], that very significant input to the radionuclide fluxes of the Pripyat River has been generated from the near river site at 10 km length upstream the Chernobyl NPP. Even particular inundation of the floodplain in this area has leaded to the significant increasing of radionuclide concentration in the Pripyat River.…”

“…Such studies were performed as in Ukraine [1][2][3] as within the international projects, e.g., IAEA VAMP Programme -River and Reservoir Modelling Working Group [4], ECP-3 Project of the Commission European Communities-Belarus, Russia, Ukraine Programme on the radiological consequences of the Chernobyl accident [5], and others. For these studies the special scenarios have been prepared including the systemised data on the water discharges, suspended sediment and concentrations of 137 Cs and 90 Sr in dilute and in suspended sediments of the Pripyat River and Dnieper River -the main tributaries to the Kiev Reservoir, as also the data about the hydrological and radiological parameters of the downstream reservoirs -Kanev, Kremenchug, Dneprodzerzhinsk, Zaporozhe and Kakhovka reservoirs.…”