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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| Project Status |
Completed (Fiscal Year 2011)
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| 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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| Keywords | 砂丘 / 風紋 / 砂丘列 / 風洞実験 / 地形学 / 斜面上の風紋 / 風紋の限界進行傾斜角 / 風紋波長の規定要因 / 横列砂丘の風上側斜面形態 / 星型砂丘の模擬実験 / 砂丘砂の鉱物組成 / 鳥取砂丘の成立史 / 宇宙線生成核種分析 / 横列砂丘 / 風上側斜面傾斜角 / Great Sand Dunes / Kelso Dunes / Imperial Sand Dunes / 鳥取砂丘 / 地形計測 / 傾斜可変型風洞実験 / 断面形態 / 登坂降坂限界傾斜角 |
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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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Report
(4 results)
Research Products
(69 results)
