2016 Fiscal Year Final Research Report
Analysis of suspended nutrient export based on in-stream wood dynamics in a forested catchment
| 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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| Keywords | 流木 / ログジャム / 除去 / 懸濁態 / トレーサー |
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| 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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| Free Research Field |
森林水文学
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