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As part of the EC-funded project SPARTACUS a GIS-embedded radionuclide redistribution model was developed based on the existing LISEM soil erosion model. It simulates lateral radiocaesium transport and exchange in the active top soil layer and runoff water in catchment during a rainstorm event. The model was applied for the assessment of the relative extent of radiocaesium transport from the Mochovce catchment following an accidental nuclear contamination using selected rainfall intensity scenarios. In this case, a 15 mm rainfall event during 30 minutes with a maximum rainfall intensity of 75 rnm/h during 8 minutes was selected to assess the effect of ploughing on 137 Cs transport. The model results demonstrate that particulate transport contributes considerably to the IJ7 Cs transport within and from the Mochovce catchment. The l37 Cs transport from unploughed soils appears to be a factor of 35 larger than the transport from ploughed soils. The implications of the model results for selecting appropriate mitigating measures to reduce l37 Cs following a nuclear accident are discussed. measurements in soil samples were conducted in the pilot catchment to test the soil erosion LISEM and the developed radiocaesium redistribution model. Soil samples were collected to determine radiocaesium exchange distribution parameters for the developed model. Radionuclides deposited on the soil surface after a nuclear power plant accident could be a significant source of secondary contamination induced by a heavy rainstorms and subsequent wash-off processes. The extent of radionuclide wash-off transport depends on the character of the first rainstorm events and prevailing soil conditions with respect to fixation and remobilisation of radionuclides from the topsoil layer. Within the frame of the national part of the SPARTACUS project the main focus was devoted to use of the tested model for assessment of wash-off transport characteristics for the pilot catchment in relation with a hypothetical nuclear contamination. To conduct such assessment it is necessary to select appropriate rainfall intensity and soil erosion scenario that conservatively represent the expected worst- case situation. "Design" block rain intensity curves are available for about 70 Slovakian hydro- meteorological stations (4). They represent the maximum precipitation intensity period within a real rainfall event based on statistical frequency distributions and seem to be appropriate for the simulation of ,37 Cs wash-off. The intensity curves are commonly used in the civil engineering for the design of for example run-off channel dimensions.

Assessment of radiocaesium washoff transport from a pilot catchment in the first period after nuclear contamination