| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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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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