| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
|---|
| Outline of Final Research Achievements |
The purpose of this study is to investigate the effects of sand-covering to gravel-bed rivers on gravel mobilization and channel evolution. As the results, it was found that the sand-covering makes the gravel mobilization improves and the effective thickness of sand-covering for gravel mobilization is 0.4-0.5 times of the gravel size. It was also found that the channel evolution occurs by erosion of channel shoulder and accumulation of gravel and sand to the channel bed and the effective thickness of sand-covering for channel evolution is 1.1-1.2 times of the gravel size. The basic mechanism on gravel mobilization and channel evolution due to sand-covering was investigated by numerical simulations. At last, the important things for sand-covering on natural rivers are indicated.
|
