2016 Fiscal Year Final Research Report
Establishment of a watershed scale model predicting radiocesium redistribution.
| Project/Area Number |
26511001
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
復興農学
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 放射性セシウム / SWATモデル / 放射性セシウム捕捉ポテンシャル / 移行係数 / 流域 / 除染 / 流量 / 水田 |
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| Outline of Final Research Achievements |
To predict the redistribution of radio-cesium (Cs) deposited in a watershed with an accident at the Fukushima Daiichi Nuclear Power Plant on 11 March 2011, Soil Water Assessment Tool (SWAT) model developed by USDA was modified (SWAT-Cs). The SWAT-Cs was equipped the Cs module describing Cs transfer from soil to plant as a function of K concentration and radio-cesium interception potential (RIP).
The Cs module predicted well the measured Cs transfer coefficient of paddy brown rice.Performance of SWAT-Cs for daily streamflow was satisfactory.
However, due to removing surface soils during the decontamination in 2015, the parameters of SWAT-Cs should be changed after decontamination. On the other hand, SWAT-Cs performance for the stream loads of SS, K and Cs was not satisfactory. SWAT-Cs could not predict large episodic peaks of SS, K and Cs loads without increase of streamflow. This may be due to channel degradation associated with the abandonment of land managements after the accidents.
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| Free Research Field |
農学
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