| Project/Area Number |
22560520
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Hydraulic engineering
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
YAMAMOTO Koichi 山口大学, 工学部社会建設工学科, 准教授 (50355955)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 環境水理学 / 感潮河道 / 高濁度水塊 / 地形 / 二次流 / 河川湾曲 / 土砂輸送 / SSフラックス / 地形変動 / 底質 |
|---|
| Research Abstract |
The influence of a meander on a cross-sectional distribution of turbidity maximum was investigated in the estuarine channel of the Chikugo river. The cross-channel currents near the bottom flowed from the outside to the inside of the curve, and the suspended sediment concentration was high at the inside of the curve. These facts suggest that the secondary current occur in the meander of tidal channel and the suspended sediment transported by the turbidity maximum is moved into the inside of the bend. Over a period of several months, fine sediment was deposited near the river bank inside the bend. The muddy bar was formed in the center of the bend in the early stage of sedimentation, and it spread upstream of the curve gradually. It was found that the transport of fine sediment by a tidal current has played an important role in the morphodynamics of a river estuary.
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