| A study of SAR remote sensing of internal solitary waves in the north of the South China Sea: Ⅰ. Simulation of internal tide transformation |
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| 作者姓名： | FAN Zhisong ZHANG Yuanling SONG Mei |
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| 作者单位： | College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China |
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| 基金项目： | Foundation item： the National High Technology Research and Development Project （ ＂863＂ Program） of China under contract No. 2002AA633120, and the National Natural Science Foundation of China under contract No. 40706055.Acknowledgements The authors would like to thank Fan Z H et al. in the National Marine Data and Information Service of the State Oceanic Administration of China for providing the historical observed data. |
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| 摘 要： | For settlement of the well-known problem of contemporary radar imaging models, i. e. , the problem of a general underestimation of radar signatures of hydrodynamic features over oceanic internal waves and underwater bottom topography in tidal waters at high radar frequency bands （ X-band and C-band）, the impact of the ocean surface mixed layer turbulence and the significance of strat- ified oceanic model on SAR remote sensing of internal solitary waves are proposed. In the north of the South China Sea by utilizing some observed data of background field the nonlinearity coefficient, the dispersion coefficient, the horizontal variability coefficient and the phase speed in the generalized K-dV equation are determined approximately. Through simulations of internal tide transfor- mation the temporal evolution and spatial distribution of the vertical displacement and horizontal velocity of internal wave field are obtained. The simulation results indicate that the maximum amplitudes of internal solitary waves occur at depth 35 m, but the maximum current speeds take place at depth 20 m in this area of the sea （about 20°30＇N, 114°E） in August. It was noticed that considering the effects of flood current and ebb current respectively is appropriate to investigate influence of the background shear flow on coefficients of the K-dV equation. The obtained results provide the possibility for the simulation of SAR signatures of internal solitary waves under considering the impact of ocean surface mixed layer turbulence in the companion paper.
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| 关 键 词： | 潮汐 孤波 湍流 遥感系统 |
| 收稿时间： | 2005/8/17 0:00:00 |
| 修稿时间： | 2008/3/14 0:00:00 |
A study of SAR remote sensing of internal solitary waves in the north of the South China Sea： I. Simulation of internal tide transformation |
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| FAN Zhisong,ZHANG Yuanling,SONG Mei.A study of SAR remote sensing of internal solitary waves in the north of the South China Sea： I. Simulation of internal tide transformation[J].Acta Oceanologica Sinica,2008,27(4):39-56. |
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| Authors: | FAN Zhisong ZHANG Yuanling and SONG Mei |
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| Institution: | College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China |
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| Abstract: | For settlement of the well-known problem of contemporary radar imaging models,i.e.,the problem of a general underestimation of radar signatures of hydrodynamic features over oceanic internal waves and underwater bottom topography in tidal waters at high radar frequency bands(X-band and C-band),the impact of the ocean surface mixed layer turbulence and the significance of stratified oceanic model on SAR remote sensing of internal solitary waves are proposed.In the north of the South China Sea by utilizing some observed data of background field the nonlinearity coefficient,the dispersion coefficient,the horizontal variability coefficient and the phase speed in the generalized K-dV equation are determined approximately.Through simulations of internal tide transformation the temporal evolution and spatial distribution of the vertical displacement and horizontal velocity of internal wave field are obtained.The simulation results indicate that the maximum amplitudes of internal solitary waves occur at depth 35 m,but the maximum current speeds take place at depth 20 m in this area of the sea(about 20°30'N,114°E) in August.It was noticed that considering the effects of flood current and ebb current respectively is appropriate to investigate influence of the background shear flow on coefficients of the K-dV equation.The obtained results provide the possibility for the simulation of SAR signatures of internal solitary waves under considering the impact of ocean surface mixed layer turbulence in the companion paper. |
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| Keywords: | internal tide internal solitary waves turbulence SAR remote sensing |
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