| Project/Area Number |
15K06270
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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 |
Civil and environmental engineering
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| Research Institution | University of Yamanashi |
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Principal Investigator |
NISHIDA Kei 山梨大学, 大学院総合研究部, 教授 (70293438)
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| Co-Investigator(Renkei-kenkyūsha) |
NAKAMURA Takashi 山梨大学, 大学院総合研究部, 助教 (60538057)
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| Research Collaborator |
DO Thu Nga 電力大学, 講師
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 国際研究交流 / ベトナム / 水田 / 窒素フロー / 安定同位体比 / モデル解析 / 国際交流研究 / 窒素汚染 |
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| Outline of Final Research Achievements |
This study aimed to develop an method integrating numerical modelling and isotope tracing for nitrogen flow analysis in an Asian river basin. The study area was selected in northern Vietnam where major sources of nitrogen were supposed as paddy field and urban, and the filed survey and the model analysis were conducted. Ammonium was the dominant form in not only urban waste water but also in paddy waters. A hydro-quality model was established based on the pollution sources and transport/transformation processes identified by isotopic tracing, and was applied to the representative river basins. In the Cau River basin, as well as paddy filed and livestock, small-scale industry and craft village contributed to the total nitrogen loading, which are unique pollution sources in developing regions. In the Day-Nhue River basin, a large scale transboundary nitrogen flow caused by the anthropogenic change of water flow regime was first detected.
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