Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-17 - C1-23|
|Published online||14 October 2009|
Global radioactive deposition on the Yenisey-river catchment and its contribution to the summary contamination of the valley
Russian Academy of Sciences, Institute of Global Climate and Ecology, Glebovskaya Str. 20-b, 107258 Moscow, Russia
2 Moscow State University, Department of Geography, Laboratory of Soil Erosion and Fluvial Processes, Vorobiovy Gory, 119899 Moscow, Russia
The results of the retrospective global radioactive contamination mapping of the Enisey-river catchment are presented. The maps of spatial , 137Cs distributions of 1964, 1974, 1986, 2000 are compiled using the geo-information technologies in the Institute of Global Climate and Ecology. The territory of mapping is 2600000 km2. The mapping is done from the airborne-gamma-spectrum data obtained at the beginning of 1960, of 1970 and 1990. In 2000 the global levels of 137Cs are 0.4-3 kBq/m2. A small contribution of Chernobyl deposition can be registered on the maps built later 1986 (0.02-0.15 kBq/m2). The levels of 2.5-3 kBq/m2 in the region of Severo-Eniseyski and Teya localities can be estimated as the tail part of the eastern Chernobyl pattern. The present levels of 2.59-122 kBq/m2 are observed on the Enissey valley at distances of 0-1700 km from Krasnoyarsk-26. The parameters of runoff and soil erosion are estimated using the cartographic information, provided by the Laboratory of River Processes and Soil Erosion of the Moscow State University. A part of 137Cs, accumulated in the Enisey-valley from early 1960 to 2000 with the transport of soil material from interfluve of all Enisey tributaries, will be estimated using a balance model of soil erosion. The contribution of 137Cs from the catchment to the valley is estimated with respect to total 137Cs deposited in the valley.
© EDP Sciences, 2002
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