Present thoughts on the aquatic countermeasures applied to regions of the Dnieper river catchment contaminated by the 1986 Chernobyl accident

Voitsekhovitch, O.; Nasvit, O.; Los'y, I.; Berkovsky, V.

doi:10.1016/s0166-1116(09)70083-4

Cited by 11 publications

(11 citation statements)

References 1 publication

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“…The radiocesium concentration indicates a decreasing trend with increasing time after the Fukushima Dai-ichi NPP accident. Similar variation was reported for the Dnieper River in Chernobyl [14]. However, higher radioactivity was also observed in the Niida River in March, June, and September 2012 after rain events.…”

Section: Radioactivity Of 134 Cs and 137 Cssupporting

confidence: 85%

Migration behavior of 134Cs and 137Cs in the Niida River water in Fukushima Prefecture, Japan during 2011–2012

Nagao

Kanamori

Ochiai

et al. 2014

J Radioanal Nucl Chem

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Total radioactivity of 137 Cs in water samples from the Niida River was 0.025-4.18 Bq/L during May 2011-November 2012. Higher radioactivity was found during May-September 2011 and after a high flow condition caused by a rain event in 2012. The particulate phase of 134 Cs and 137 Cs was 47-48 % for May-September 2011, 75-93 % in normal flow conditions and 86-91 % in high flow conditions after December 2011. These results indicate that the supply of 134 Cs and 137 Cs from the watershed differs from the early stage up to September 2011 and from the last stage.

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Section: Radioactivity Of 134 Cs and 137 Cssupporting

confidence: 85%

Migration behavior of 134Cs and 137Cs in the Niida River water in Fukushima Prefecture, Japan during 2011–2012

Nagao

Kanamori

Ochiai

et al. 2014

J Radioanal Nucl Chem

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“…One option is to operate the Ogaki Dam in a way to buffer contamination in the reservoir. Such reservoir management was previously attempted at the Kiev Reservoir on the Dnieper River after the Chernobyl accident (Voitsekhovitch et al 1997). Here, we report numerical simulations of sand, silt, and clay transport in the Ogaki Dam Reservoir to achieve this goal.…”

Section: Introductionmentioning

confidence: 97%

Sediment and ¹³⁷ Cs transport and accumulation in the Ogaki Dam of eastern Fukushima

Yamada

Kitamura

Kurikami

et al. 2015

Environ. Res. Lett.

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The Ogaki Dam Reservoir is one of the principal irrigation dam reservoirs in the Fukushima Prefecture and its upstream river basin was heavily contaminated by radioactivity from the Fukushima Daiichi Nuclear Power Plant accident. For the purpose of environmental assessment, it is important to determine the present condition of the water in the reservoir and to understand the behavior of sedimentsorbed radioactive cesium under different modes of operation of the dam, as these factors affect further contamination of arable farmlands downstream of the reservoir through sediment migration. This paper addresses this issue with numerical simulations of fluvial processes in the reservoir using the twodimensional Nays2D code. We distinguish three grades of sediment (clay, silt, and sand), as cesium adherence depends on sediment grain size and surface area. Boundary conditions for the simulations were informed by monitoring data of the upstream catchment and by the results from a separate watershed simulation for sediment transport into the reservoir. The performance of the simulation method was checked by comparing the results for a typhoon flood in September 2013 against field monitoring data. We present results for sediment deposition on the reservoir bed and the discharge via the dam under typical yearly flood conditions, for which the bulk of annual sediment migration from the reservoir occurs. The simulations show that almost all the sand and silt that enter into the reservoir deposit onto the reservoir bed. However, the locations where they tend to deposit differ, with sand tending to deposit close to the entrance of the reservoir, whereas silt deposits throughout the reservoir. Both sand and silt settle within a few hours of entering the reservoir. In contrast, clay remains suspended in the reservoir water for a period as long as several days, thus increasing the amount that is discharged downstream from the reservoir. Under the current operating mode of the dam, about three-quarters of clay that enters the reservoir during the flood is discharged downstream during and in the days following the flood. By raising the height of the dam exit, the amount of clay exiting the reservoir can be reduced by a factor of three. The results indicate that the dam can be operated to buffer radioactive cesium and limit the contamination spreading into lowland areas of the Ukedo River basin. These results should be a factor in considerations for the future operation of the Ogaki Dam, and will be of interest for other operators of dam reservoirs in areas contaminated by radioactive fallout.

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“…Countermeasures may be grouped into two categories: those aimed at reducing doses from radioactivity in drinking water and those aimed at reducing doses from consumption of aquatic foodstuffs, principally freshwater fish. In the context of an atmospheric fallout of radioactivity to both terrestrial and aquatic systems, it has been shown (Voitsekhovitch, Nasvit, Los'y & Berkovski, 1997;Stone, Smith, Jackson & Ibbotson, 1997) that doses from terrestrial foodstuffs are in general more significant than doses from drinking water and aquatic foodstuffs. Measures to reduce doses via drinking water may, however, be required, particularly in the short-term (timescale, weeks) after a fallout when activity concentrations in surface waters are relatively high.…”

Section: Introductionmentioning

confidence: 99%

A critical review of measures to reduce radioactive doses from drinking water and consumption of freshwater foodstuffs

Smith

Voitsekhovitch

Håkanson

et al. 2001

Journal of Environmental Radioactivity

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Following a radioactive fallout event, there are a number of possible intervention measures to reduce radioactive doses to the public via the surface water pathway. We have critically reviewed the options available to decision-makers in the event of radioactive contamination of surface waters. We believe that the most effective and viable measures to reduce radioactivity in drinking water are those which operate at the water treatment and distribution stage. Intervention measures to reduce concentrations of radioactivity in rivers and reservoirs are expected to be much less viable and efficient at reducing doses via the drinking water pathway. Bans on consumption of freshwater fish can be effective, but there are few viable measures to reduce radioactivity in fish prior to the preparation stage. Lake liming and biomanipulation have been found to be ineffective for radiocaesium, although the addition of potassium to lakewaters appears promising in some situations. Lake liming may be effective in reducing radiostrontium in fish, though this has not, to our knowledge, been tested. De-boning fish contaminated by strontium is probably the most effective food preparation measure, but salting and freezing can also reduce radiocaesium concentrations in fish. The provision of accurate information to the public is highlighted as a key element of countermeasure implementation.

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Present thoughts on the aquatic countermeasures applied to regions of the Dnieper river catchment contaminated by the 1986 Chernobyl accident

Cited by 11 publications

References 1 publication

Migration behavior of 134Cs and 137Cs in the Niida River water in Fukushima Prefecture, Japan during 2011–2012

Migration behavior of 134Cs and 137Cs in the Niida River water in Fukushima Prefecture, Japan during 2011–2012

Sediment and ¹³⁷ Cs transport and accumulation in the Ogaki Dam of eastern Fukushima

A critical review of measures to reduce radioactive doses from drinking water and consumption of freshwater foodstuffs

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Present thoughts on the aquatic countermeasures applied to regions of the Dnieper river catchment contaminated by the 1986 Chernobyl accident

Cited by 11 publications

References 1 publication

Migration behavior of 134Cs and 137Cs in the Niida River water in Fukushima Prefecture, Japan during 2011–2012

Migration behavior of 134Cs and 137Cs in the Niida River water in Fukushima Prefecture, Japan during 2011–2012

Sediment and 137 Cs transport and accumulation in the Ogaki Dam of eastern Fukushima

A critical review of measures to reduce radioactive doses from drinking water and consumption of freshwater foodstuffs

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Product

Resources

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Sediment and ¹³⁷ Cs transport and accumulation in the Ogaki Dam of eastern Fukushima