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Cs discharge in rivers from immediately after the Fukushima accident until 2017Sakuma, Kazuyuki; Nakanishi, Takahiro; Yoshimura, Kazuya; Kurikami, Hiroshi; Namba, Kenji*; Zheleznyak, M.*
Journal of Environmental Radioactivity, 208-209, p.106041_1 - 106041_12, 2019/11
Times Cited Count：22 Percentile：65.32(Environmental Sciences)We developed a simple model to evaluate and predict Cs discharge from catchment using tank model and L-Q equation. Using this model, Cs discharge and discharge ratio from Abukuma River and 13 other rivers in Fukushima coastal region were estimated from immediately after Fukushima accident to 2017. Cesium-137 discharge ratio to the deposition amount in catchment through Abukuma River and 13 other rivers in Fukushima coastal region during about initial six months were estimated to be 18 TBq (3.1%) and 11 TBq (0.8%), respectively. These values were 1-2 orders of magnitude larger than the previous study observed after June 2011, indicating that initial Cs discharge from catchment through rivers was a significant. However it was founded that an impact on the ocean derived from initial Cs discharge through river can be limited because Cs discharge from Abukuma River and 13 other rivers in Fukushima coastal region (29 TBq) was two orders of magnitude smaller than the direct release from FDNPP into the ocean (3.5 PBq) and from atmospheric deposition into the ocean (7.6 PBq).
Cs discharge from river catchments during initial period after Fukushima accident using a tank modelSakuma, Kazuyuki; Zheleznyak, M.*; Namba, Kenji*
no journal, ,
We developed a simple model that is composed of tank model, relationships between water discharge and suspended solids load, and two-component exponential model for Cs concentration in river water to estimate Cs discharge from river catchments. We applied this model to Abukuma River and several rivers in coastal region in Fukushima to estimate Cs discharge from these catchments through rivers during initial period after Fukushima accident.
Cs discharge from river catchments using a tank modelSakuma, Kazuyuki; Zheleznyak, M.*; Namba, Kenji*
no journal, ,
To understand how much radiocesium discharge to a reservoir and the ocean through rivers from catchments is important for residents and municipal officials from immediately after Fukushima accident to the present. It is not easy to estimate Cs discharge from catchments based on observations because there are many processes such as continuous monitoring of water level and turbidity and Cs concentrations in river water to estimate Cs discharge fluxes. Therefore we developed a user-friendly model that is composed of tank model, which can predict water discharge easily, relationships between water discharge and suspended solids load, and two-component exponential models for Cs concentration in river water. Using developed model we estimated Cs discharge to the ocean from Abukuma River catchment and several rivers in coastal region from immediately after Fukushima accident to 2017.
Zheleznyak, M.*; Pylypenko, O.*; Kivva, S.*; Sakuma, Kazuyuki; Igarashi, Yasunori*; Wakiyama, Yoshifumi*; Konoplev, A.*; Namba, Kenji*
no journal, ,
We developed physically-based watershed models based on the distributed hydrological-sediment transport model. The model implementation for the experimental plots in Fukushima prefecture was conducted for particulate Cs transport. Also, we developed model that combines the watershed empirical models based on the washing-out coefficient approach and GIS data. The model was tested on the basis of the measurements of Cs concentration in Abukuma river and validated also on the basis of the data sets of radionuclide transport in the Pripyat and Dnieper rivers.
