2011 Fiscal Year Final Research Report
Dynamics of wind ripples and dune morphology
| Project/Area Number |
21500998
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geography
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| Research Institution | Tottori University |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2011
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| Keywords | 砂丘 / 風紋 / 砂丘列 / 風洞実験 / 地形学 |
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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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