| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Research Abstract |
We collected 684 cross sections of wind ripples from various slopes at the Tottori Sand Dunes, southwest Japan. The results show that the wave-lengths of ascending wind ripples(12 cm) were larger than those of the descending ones(6 cm): as the proceeding angles increased, the waves became longer. The cross-sectional shapes were classified into four types according to the proceeding angles. The critical proceeding angles of the wind ripples under the ascending and descending conditions were 24°and 17°, respectively. On the other hand, the angles of stoss-side slopes of transverse dunes are dominant in ca 7°according to measurements using contour maps.
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