Using fallout radionuclides to investigate recent overbank sedimentation rates on river floodplains: an overview
- 1Institute of Ecology and Geography, Kazan Federal University, Kremlevskaya st., Kazan, Russia
- 2Faculty of Geography, Lomonosov Moscow State University, Leninskie Gory, Moscow Russia
- 3Geography, College of Life and Environmental Sciences, University of Exeter, UK
Keywords: Overbank sedimentation rates, river floodplain, fallout radionuclide, 137Cs, 210Pb, 7Be, 239+240Pu; geochronology, Chernobyl fallout, bomb derived-fallout
Abstract. Information on rates of overbank sedimentation on river floodplains is needed for a variety of purposes. Use of 137Cs and 210Pbex measurements provides an effective means of estimating medium-term floodplain sedimentation rates and that approach has now been successfully used in many areas of the world. This contribution reviews the use of 137Cs and 210Pbex measurements in floodplain sedimentation investigations and discusses some of the important sampling requirements and key issues associated with interpreting the measurements, and subsequently deriving reliable estimates of sedimentation rates. The potential use of other radionuclides, including 241Am, 238,239+240Pu, and 7Be is considered, and the advantages of using two or more radionuclides, in combination, is highlighted.