| New Interpretation of Dependence of Wind Stress on Wave State |
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| 作者姓名： | ZHAO Dong-liang |
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| 作者单位： | Institute of Physical Oceanography，Ocean University of China，Qingdao 266003，China，College of Environmental Science and Engineering，Ocean University of China，Qingdao 266003，China |
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| 基金项目： | This project is supported by the National Natural Science Foundation of China (Grant No.40276005), Natural Sci-ence Foundaton of Shandong Province (No.Z2002E01)and 863 Project(No.2001AA630307,2002AA639150) |
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| 摘 要： | Based on observations from buoys, it is found that the wave age is well correlated with the nondimensional wave height, and this correlation is best described by a 3/5-power law. This similarity law is valid in the cases of wind waves as well as swells under natural sea states. On the basis of the 3/5-power law combined with the well-known 3/2-power law, it is shown that the wave-induced wind stress increases rapidly with wave age, indicating that the traditional observations or analytic techniques have only given the turbulent Reynolds stress induced by short wind waves, but excluded the long-wave-induced wind stress. The latter constitutes a small fraction to the total wind stress when the wave age is smaller than 1.0. The increase of sea-surface roughness with wave age can be attributed to wave breaking.
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New Interpretation of Dependence of Wind Stress on Wave State |
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| ZHAO Dong-liang and LOU An-gang
Institute of Physical Oceanography,Ocean University of China,Qingdao ,China College of Environmental Science and Engineering,Ocean University of China,Qingdao ,China.New Interpretation of Dependence of Wind Stress on Wave State[J].China Ocean Engineering,2003,17(4):577-588. |
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| Authors: | ZHAO Dong-liang and LOU An-gang
Institute of Physical Oceanography Ocean University of China Qingdao China College of Environmental Science and Engineering Ocean University of China Qingdao China |
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| Institution: | Institute of Physical Oceanography, Ocean University of China, Qingdao, 266003, China College of Environmental Science and Engineering, Ocean University of China, Qingdao,266003, China |
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| Abstract: | Based on observations from buoys, it is found that the wave age is well correlated with the nondimensional wave height, and this correlation is best described by a 3/5-power law. This similarity law is valid in the cases of wind waves as well as swells under natural sea states. On the basis of the 3/5-power law combined with the well-known 3/2-power law, it is shown that the wave-induced wind stress increases rapidly with wave age, indicating that the traditional observations or analytic techniques have only given the turbulent Reynolds stress induced by short wind waves, but excluded the long-wave-induced wind stress. The latter constitutes a small fraction to the total wind stress when the wave age is smaller than 1.0. The increase of sea-surface roughness with wave age can be attributed to wave breaking. |
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| Keywords: | wind stress drag coefficient wave age wind waves |
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