Estimation of sea surface drag coefficient under strong wind condition based on the wave data
| Project/Area Number |
24760397
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Hydraulic engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
YOKOTA Masaki 九州大学, 工学(系)研究科(研究院), 助教 (60432861)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 海面抵抗係数 / 波浪推算 / データ同化 |
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| Research Abstract |
The sea surface drag coefficient, an important parameter of the energy transfer from winds to waves in wave prediction model, is generally described as a linear function of wind speed. However, it might be inadequate to apply their extrapolation to strong wind conditions. For the purpose of clarifying the appropriate values of the sea surface drag coefficient in high wind speed, the ADWAM was modified to estimate the sea surface drag coefficients as its control variables from observational wave data. As a result, I confirm that the sea surface drag coefficient was automatically corrected to appropriate values (similar to Mitsuyasu & Honda's equation in wind speed less than 30m/s) with the method although arbitrary initial values of the sea surface drag coefficient were used for the estimations. It was also confirmed that the possibility of the estimation of the sea surface drag coefficient under stormy conditions on the basis of the wave data remotely observed from storms.
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Report
(3 results)
Research Products
(10 results)
