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- Title
Long-term simulation of dissolved 90Sr flux and stream discharge at a small catchment in the Chernobyl Exclusion Zone using 90Sr and water mass balance models.
- Authors
Igarashi, Yasunori; Zheleznyak, Mark; Onda, Yuichi; Wakiyama, Yoshifumi; Laptev, Gennady; Lisovyi, Hlib; Obrizan, Sergii; Samoilov, Dmitry; Matsushita, Koki; Namba, Kenji
- Abstract
The strontium 90 (90Sr), which is released into the environment from the Chernobyl accidentderived fuel particle, is one the most important radionuclide at the river water system in theChernobyl Exclusion Zone (CEZ). The main long-term source of exchangeable and available90Sr in the environment of CEZ is the gradually dissolving micron-size "fuel particles" ofthe accidental release from the Chernobyl accident (26/04/1986), formed by themechanical destruction of nuclear fuel. Previous studies have shown that the 90Sr istransported through the stream water as the dissolved phase, and the tight couplingbetween the dissolved 90Sr concentration and the water discharge rate. Long-termtrend of dissolved 90Sr concentration in the river water have been expressed by theexponential models and parametric hydrochemical models. On the other hand, it isnecessary to describe the dynamics of 90Sr as the mass-balance equation, for thefurther understanding of 90Sr in the environment. Therefore, the primary objective isto describe the dynamics of 90Sr in the river water system using 90Sr and watermass balance equations. We used a combination of log-term field observations andhydrological model simulations. The hydrological model comprises a snow model,transpiration model and a watershed hydrologic model. The 90Sr flux model linked thedischarge rate via a hydrochemical parameterization scheme. The model was validatedagainst field measurements taken small catchment inside the CEZ. The ?hydrologicalmodel, which is forced observed daily precipitation and daily average temperature,reproduced the measured snowdepth and discharge rate well. The agreement ofmodeled 90Sr concentration and 90Sr flux were scatter compared to that of dischargerate. This is the first to combined the 90Sr mass balance equation and hydrologicalmodel to simulate long-term trend of 90Sr flux through the small river from CEZ.
- Subjects
WATER masses; WATER use; FLUX (Energy); NUCLEAR fuels; WATERSHEDS
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article