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Quantification of the sediment budget of a river basin, based on reconstruction of the post-fallout redistribution of Chernobyl particle-bound 137Cs
Authors
Belyaev V.
Bondarev V.
+9 more
Bonté P.
Evrard O.
Golosov V.
Ivanova N.
Lefèvre I.
Markelov M.
Ottlé C.
Paramonova T.
Shamshurina E.
Publication date
1 March 2020
Publisher
Abstract
Quantitative assessment of the sediment budget of a fluvial system is a key approach to understanding its geomorphic behaviour and an essential tool for investigating the redistribution of particle-bound contaminants along the sediment cascade. Here, we present a study involving the application of several independent approaches for quantifying the post-fallout (1986-2009) redistribution of Chernobyl particle-bound 137Cs and the basin-scale sediment budget for the River Plava basin situated in the northern part of the Srednerusskaya Upland (Central European Russia). The techniques employed include 137Cs-based sediment tracing, two soil erosion models and the analysis of soil profile morphology. The results show that most of the sediment originating from human-accelerated soil erosion on cultivated slopes is redeposited on the uncultivated lower parts of the slopes or in the bottoms of infilled gullies, hollows and 1 - 3rd order valleys. The River Plava valley itself represents a system dominated by efficient transport, with very limited floodplain sediment storage. The 137Cs-contaminated sediment export from the River Plava basin outlet exerts a significant impact on the River Upa. Its floodplain sediment contamination by 137Cs downstream of the River Plava mouth increases by almost an order of magnitude. Copyright © 2012 IAHS Press
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Last time updated on 04/04/2020