title: Equation to predict the (137)Cs leaching dynamic from evergreen canopies after a radio-cesium deposit.
abstract: The Fukushima Daiishi nuclear power plant (FDNPP) accident led to a massive radionuclide deposition mainly onto Japanese forest canopies. In our previous study, an improved double exponential (IDE) equation including rainfall intensity was proposed to estimate the (137)Cs hydrological transport from evergreen canopies to the ground. This equation used two types of parameters, kinetic (k1 and k2) and leachable stock (A1 and A2). Those parameters have been estimated by adjusting them in the IDE equation in order to accurately describe the measured cumulative leached (137)Cs from canopies (k1 = 4.2E-04-5.0E-04 d(-1), k2 = 1.2E-02-1.7E-02 d(-1), A1 = 62-99 kBq/m(2), A2 = 25-61 kBq/m(2)). In this study, we linked the total leachable stock (Aleachable, a parameter of the IDE equation corresponding to A1 + A2) to a physiological criteria (the canopy closure CC, which can be measured with a simple camera equipped with a fish-eye objective). Furthermore, the kinetic parameters measured for Japanese cedar (k1 = 5.0E-04 d(-1), k2 = 1.2E-02 d(-1), and r12 = 0.22 (r12 = A1/A2) could also be used for two other coniferous species: Japanese cypress and spruce. This suggests that these parameters could be constants for coniferous forests.
authors.affiliation: Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: wataiso@free.fr.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Loffredo
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: Institute for Radioprotection and Nuclear Safety, IRSN/PRP-ENV/SERIS, L2BT, Building 186, Cadarache 13115 Saint Paul lez Durance cedex, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Hurtevent
authors.affiliation: Institute for Radioprotection and Nuclear Safety, IRSN/PRP-ENV/SERIS, L2BT, Building 186, Cadarache 13115 Saint Paul lez Durance cedex, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Coppin
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D002588:Cesium Radioisotopes / Q000032:analysis*; D032485:Cryptomeria / Q000502:physiology; D065928:Forests; D062406:Fukushima Nuclear Accident; D008962:Models, Theoretical; D011834:Radiation Monitoring; D011847:Radioactive Fallout / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D000396:Air Pollutants, Radioactive; D002588:Cesium Radioisotopes; D011847:Radioactive Fallout; D012990:Soil Pollutants, Radioactive
keywords: Canopies; Dynamic; Evergreen; Fukushima Daiichi nuclear power plant accident; Radio-cesium; Throughfall