| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
In the Tottori Sand Dunes, mega-ripples with a wavelength of more than 1 m appeared on the edge of the exposed volcanic ash layer for three years from 2013 to 2015. Taking this as a hint, a wind tunnel experiment was conducted, and it was clarified that the amount of polypropylene coarse-grained particles that simulated the aggregated particles of volcanic ash sprayed on the sand surface was one of the critical conditions for forming mega-ripples. In addition, it was confirmed by wind tunnel experiments that mega-ripples are likely to appear only in the area where the sand surface is lowered. This could be confirmed by the morphological characteristics of mega-ripples found in the Great Sand Dunes of the United States.
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