| Project/Area Number |
26450481
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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 |
Environmental agriculture(including landscape science)
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| Research Institution | Tottori University |
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Principal Investigator |
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| Research Collaborator |
FUKUTOMI Shogo
YONEDA Asami
MORIISHIDA Takuya
MORISHITA Naoya
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | 流木 / ログジャム / 除去 / 懸濁態 / トレーサー / 濁度 / 河床変動 / 除去実験 / 流域管理 / 栄養塩 / 森林 / 山地河川 |
|---|
| Outline of Final Research Achievements |
In forested headwater catchments, in-stream wood and wood accumulations (logjams) can play important roles in regulating streamflow because of their geomorphic and hydraulic characteristics. However, there have been only a few detailed studies of the roles of small in-stream wood (SW). In this study, to clarify the effects of streamflow fluctuations and logjams on suspended sediment concentrations, we conducted a SW removal experiment with salt tracer injections. Changes in tracer velocities with the SW removal depended on the channel bed evolution. In addition, turbidity during the small to medium scales of storm flow events after the SW removal was higher by 1 to 2 order of magnitudes than that before the removal. These results imply that SW as a clogging component of logjams is important for stream water quality in forested headwater catchments.
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