| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2017: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2016: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2015: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
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| Outline of Final Research Achievements |
In rivers which formed multi-row bars or braided rivers, riverbanks often have wavy shape on a scale of several times of river width. In such rivers, a wide width part (anti-node) and a narrow part (node) appear by turns in the longitudinal direction (gourd type channel). The elucidation of this phenomenon accompanied by bank erosion is very important on river management works. The hydraulic experiments, the numerical simulations and the field observations on the gourd type channels were conducted in this study. The results of this study as follows. It is possible to produce the river channel disturbance for river environmental restoration by maintenance of the old channel being performed using the alternating mainstream change which is the characteristic of a gourd type channel river. The excessive movement of a river channel is controlled by installing ground shills with the interval which is the equal to the wavelength of gourd type shape of a channel.
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