title: A new comparison of marine dispersion model performances for Fukushima Dai-ichi releases in the frame of IAEA MODARIA program.
abstract: A detailed intercomparison of marine dispersion models applied to the releases from Fukushima Dai-ichi nuclear power plant was carried out in the frame of MODARIA program, of the IAEA. Models were compared in such a way that the reasons of the discrepancies between them can be assessed (i.e., if they are due to the hydrodynamic part, the dispersion part, and the ultimate reasons). A sequential chain of dispersion exercises was carried out with this purpose. The overall idea is to harmonize models, making them run with the same forcing in a step-by-step procedure, in such a way that the main agent in producing discrepancy between models can be found. It was found that the main reason of discrepancies between models is due to the description of the hydrodynamics. However, once this has been suppressed, some variability between model outputs remains due to intrinsic differences between models (as numerical schemes). The numerical experiments were carried out for a perfectly conservative radionuclide and for (137)Cs (including water/sediment interactions). Model outputs for this radionuclide were also compared with measurements in water and sediments.
authors.affiliation: Dpt Física Aplicada I, ETSIA, Universidad de Sevilla, Ctra Utrera km 1, 41013, Sevilla, Spain. Electronic address: rperianez@us.es.
authors.forename: Raúl
authors.initials: R
authors.lastname: Periáñez
authors.affiliation: Institute of Mathematical Machine and System Problems, Glushkov av., 42, Kiev, 03187, Ukraine.
authors.forename: Igor
authors.initials: I
authors.lastname: Brovchenko
authors.affiliation: IRSN, PRP-ENV/SESURE/LERCM, La Seyne sur Mer, France.
authors.forename: Celine
authors.initials: C
authors.lastname: Duffa
authors.affiliation: Korea Institute of Ocean Science and Technology, 787 Hean-ro, Sangnok-gu, Ansan-si, Gyeonggi-do, 426-744, Republic of Korea.
authors.forename: Kyung-Tae
authors.initials: KT
authors.lastname: Jung
authors.affiliation: Japan Atomic Energy Agency, 2-4 Shirakata Shirane, Tokai, Ibaraki, 319-1195, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Kobayashi
authors.affiliation: Instituto de Engenheria Nuclear, Rua Hélio de Almeida 75, Ilha do Fundão, CEP 21941-906, Rio de Janeiro, Brazil.
authors.forename: Fernando
authors.initials: F
authors.lastname: Lamego
authors.affiliation: Institute of Mathematical Machine and System Problems, Glushkov av., 42, Kiev, 03187, Ukraine.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Maderich
authors.affiliation: Korea Atomic Energy Research Institute, Daedeok-Daero 989-111, Yuseong-Gu, Daejeon, Republic of Korea.
authors.forename: Byung-Il
authors.initials: BI
authors.lastname: Min
authors.affiliation: Bundesamt fuer Seeschifffahrt und Hydrographie, Wüstland 2, 22589, Hamburg, Germany.
authors.forename: Hartmut
authors.initials: H
authors.lastname: Nies
authors.affiliation: IAEA Environment Laboratories, 4a Quai Antoine 1er, MC-98000, Monaco.
authors.forename: Iolanda
authors.initials: I
authors.lastname: Osvath
authors.affiliation: National Technical University of Athens, Iroon Polytexneiou 9, 15780, Zografou, Greece.
authors.forename: Maria
authors.initials: M
authors.lastname: Psaltaki
authors.affiliation: Korea Atomic Energy Research Institute, Daedeok-Daero 989-111, Yuseong-Gu, Daejeon, Republic of Korea.
authors.forename: Kyung-Suk
authors.initials: KS
authors.lastname: Suh
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis*; D062406:Fukushima Nuclear Accident; D019015:Geologic Sediments / Q000032:analysis*; D057446:Hydrodynamics; D007564:Japan; D008962:Models, Theoretical; D011834:Radiation Monitoring / Q000379:methods*; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D014875:Water Pollutants, Radioactive
keywords: Caesium-137; Fukushima Dai-ichi; Hydrodynamics; Marine dispersion; Sediments