2004 Fiscal Year Final Research Report Summary
Dynamic conservation mechanism of temporal water area and its roles in preservation of riparian ecosystem
| Project/Area Number |
14350264
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水工水理学
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| Research Institution | Nagoya University |
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Principal Investigator |
TSUJIMOTO Tetsuro Nagoya University, Graduate School of Engineering, Professor, 工学研究科, 教授 (20115885)
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| Co-Investigator(Kenkyū-buntansha) |
SUMI Teteuya Nagoya University, Graduate School of Engineering, Lecturer, 工学研究科, 講師 (50303673)
TODA Yuji Nagoya University, Graduate School of Engineering, Lecturer, 工学研究科, 講師 (60301173)
TERAMOTO Atsuko Matsue Collage of Technology, Research Associate, 助手 (40362280)
MORI Seiichi Gifu Keizai University, Professor, 経済学部, 教授 (50308657)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Backwater / Wando / physical environment / Geography in small scale / Water quality / denitrification |
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| Research Abstract |
(1)Formation process of "Wando" backwater
We conducted field research at "Wando" backwater, which is an embayment opening to main river channel, at Kiso river's a series of grolyns. as the example case with tidal effect in downstream area. Two scale geography, one is large scale including main Wando's scouring and the other is sub channel in deposition area in smaller scale by field research, literature research, and numerical simulations.
It is explained main depression at Wando is formed under flood, by bed load transport affected by of vegetation area's expansions
And subchannels are formed by daily tidal motion of sediment on deposition area of sand. Additionally, these channels take an important role to supply different water quality to Wando area from sand substrate during ebb-tide stage.
(2)Water quality in backwater and subsurface water
Water movement in subsurfacewater surrounding backwater, i.e. Wando, pond, are significant for mechanisms of water quality formation. Field research and numerical simulation shows that subsurface flow is change by the existence of backwater and accelerated.
In sandbar, water quality, especially in Nitrogen, of subsurface water is changed by both by denitrification and supply from surface layer, which include organic matter.
(3)Growth and detachment of algae
When we consider water quality in backwater, the effects by argae production is important. We conducts field experiment and laboratory experiment on algae's production, competition between filamentous and non-filamentous periphyton, and debouchments. Additionaly, we made numerical simulation model on algae competition
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