title: Evaluation of radiocaesium wash-off by soil erosion from various land uses using USLE plots.
abstract: Radiocaesium wash-off associated with soil erosion in different land use was monitored using USLE plots in Kawamata, Fukushima Prefecture, Japan after the Fukushima Dai-ichi Nuclear Power Plant accident. Parameters and factors relating to soil erosion and (137)Cs concentration in the eroded soil were evaluated based on the field monitoring and presented. The erosion of fine soil, which is defined as the fraction of soil overflowed along with discharged water from a sediment-trap tank, constituted a large proportion of the discharged radiocaesium. This indicated that the quantitative monitoring of fine soil erosion is greatly important for the accurate evaluation of radiocaesium wash-off. An exponential relationship was found between vegetation cover and the amount of eroded soil. Moreover, the radiocaesium concentrations in the discharged soil were greatly affected by the land use. These results indicate that radiocaesium wash-off related to vegetation cover and land use is crucially important in modelling radiocaesium migration.
authors.affiliation: Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: yoshimura.kazuya@jaea.go.jp.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Yoshimura
authors.affiliation: Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Onda
authors.affiliation: Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kato
mesh_terms: D000383:Agriculture; D002586:Cesium / Q000032:analysis*; D002588:Cesium Radioisotopes / Q000032:analysis*; D016468:Forestry; D062406:Fukushima Nuclear Accident; D055593:Geological Phenomena; D007564:Japan; D008962:Models, Theoretical; D011834:Radiation Monitoring; D011847:Radioactive Fallout / Q000032:analysis*; D012987:Soil / Q000737:chemistry; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D011847:Radioactive Fallout; D012987:Soil; D012990:Soil Pollutants, Radioactive; D002586:Cesium
keywords: Fukushima Dai-ichi Nuclear Power Plant accident; Radiocaesium; Soil erosion; USLE plot