2011 Fiscal Year Final Research Report
Assessing the impacts of riverbed incision and smoothing on aquatic ecosystems in mid river segments
| Project/Area Number |
21710247
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Resource conservation science
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| Research Institution | Hokkaido University |
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Principal Investigator |
NEGISHI Junjiro 北海道大学, 大学院・地球環境科学研究院, 助教 (90423029)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 生態系保全 / 流域管理 |
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| Research Abstract |
The dominant riverbed material in the mid segment of Kiso River has changed over time from sands and gravels to peat outcrops. In places, substantial riverbed incisions having> 20m water depth occurred probably because the loss of peat outcrop(few meters think) resulted in acute erosions of sandy deposits below. Furthermore, peat outcrop appeared to provide a suitable habitat for mayfly(Ephoron shigae), which is often considered as a pest, serving as a main source of huge swarms of adults in the area.
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