| Vertical variations of wave-induced radiation stress tensor |
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| 作者姓名： | Zheng Jinhai Yan Yixin |
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| 作者单位： | Received June 24，2001; accepted July 25，2001 |
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| 基金项目： | The project was supported by the Research Fund for the Doctoral Program of Higher Education of China under contract
No. 9802940 |
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| 摘 要： | INTRODUcrIONThe concept of radiation stress was deve1oPed by tonguet--Higgins and Stewart (1964 ),who intreduced the definition of radiation stress as the excess mornentum due to the presence ofwaves, on the basis of time-averaged laws of Newtonian fluid mechanics and the assmption ofa unifOrm velocity distribution over depth. Subequently, the theory has been applied success-fully in the investigation of phenomena such as wave set-up and set--down (Bowen et al.,l968), longshore currents …
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| 关 键 词： | Linear wave theory wave-induced radiation stress tensor vertical variation |
| 收稿时间： | 2001/6/24 0:00:00 |
| 修稿时间： | 2001/7/25 0:00:00 |
Vertical variations of wave-induced radiation stress tensor |
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| Zheng Jinhai,Yan Yixin.Vertical variations of wave-induced radiation stress tensor[J].Acta Oceanologica Sinica,2001,20(4):597-605. |
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| Authors: | Zheng Jinhai and Yan Yixin |
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| Institution: | Research Institute of Coastal and Ocean Engineering, Hohai University,1 Xikang Road, Nanjing 210098, China |
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| Abstract: | The distributions of the wave-induced radiation stress tensor over depth are studied by using the linear wave theory, which are divided into three regions, i.e., above the mean water level, below the wave trough level, and between these two levels. The computational expressions of the wave-induced radiation stress tensor at the arbitrary wave angle are established by means of the Eulerian coordinate transformation, and the asymptotic forms for deep and shallow water are also presented. The vertical variations of a 30° incident wave-induced radiation stress tensor in deep water, intermediate water and shallow water are calculated respectively. The following conclusions are obtained from computations.The wave-induced radiation stress tensor below the wave trough level is induced by the water wave particle velocities only, whereas both the water wave particle velocities and the wave pressure contribute to the tensor above the wave trough level. The vertical variations of the wave-induced radiation stress tensor are influenced substantially by the velocity component in the direction of wave propagation. The distributions of the wave-induced radiation stress tensor over depth are nonuniform and the proportion of the tensor below the wave trough level becomes considerable in the shallow water. From the water surface to the seabed, the reversed variations occur for the predominant tensor components. |
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| Keywords: | Linear wave theory wave-induced radiation stress tensor vertical variation |
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