| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
|
|---|
| Outline of Final Research Achievements |
Many rives have ecological and physical values that have been impaired by sedimentation. For example bed degradation, armored gravel bed formation and loss of spawning and rearing areas for fish in rivers downstream of dams may be serious problems caused by the cutoff sediment supply. Although sediment augmentation may be useful technique for these problems, this is still in the development stage. In this study, we investigated the bed aggradation and channel variation due to sediment augmentation through clarifying 1) relationship between augmentation arrangements and flush efficiency and transportability of replenishment sediment, 2) effects of sediment augmentation on bed variation, 3) effects of sand content on initial gravel motion in gravel-beds and 4) gravel mobilization in an armor layer due to sand supply as an augmentation. The essential points for sediment augmentation technique in actual rivers are also suggested.
|
