| Infragravity waves with internal wave characteristics in the south of the Bohai Sea of China |
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| 作者姓名： | Fan Zhisong Gao Guoping Yin Xunqiang Fan Yu Wu Wei |
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| 作者单位： | Marine Environment College,Ocean University of China,Qingdao 266003, China |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | The measurements by using ADCP (500 KH) and CTD were made during August 2000 in the south (37°55''N, 120°25''E) of the Bohai Sea, where the water depth was about 16.5m. The data of horizontal velocity with sampling interval of 2 min in 7 layers were obtained. The power spec-trum analysis of these data indicates that there are very energetic infragrvity waves with a period of about 6 min. The coherence spetrum analysis and the analysis of temporal variation of shear show that these infragravity waves are mainly the free wave model (properties of edge waves), in the meantimethey possess some characteristics of internal waves, which are likely due to the distinctive marine environment in this area. It is speculated on that the instability processes (chiefly shear instability) of sheared stratified tidal flow owing to the effect of sea-floor slope in the coastal area might be the main mechanism generating these infragravity waves.
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| 关 键 词： | Infragravity waves edge waves internal waves vertical shear of horizontal velocity internal mixing |
| 收稿时间： | 2002/12/1 0:00:00 |
| 修稿时间： | 1/6/2003 12:00:00 AM |
Infragravity waves with internal wave characteristics in the south of the Bohai Sea of China |
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| Fan Zhisong,Gao Guoping,Yin Xunqiang,Fan Yu,Wu Wei.Infragravity waves with internal wave characteristics in the south of the Bohai Sea of China[J].Acta Oceanologica Sinica,2003,22(2):171-178. |
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| Authors: | Fan Zhisong Gao Guoping Yin Xunqiang Fan Yu and Wu Wei |
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| Institution: | Marine Environment College, Ocean University of China, Qingdao 266003, China |
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| Abstract: | The measurements by using ADCP (500 KH) and CTD were made during August 2000 in the south (37°55'N, 120°25'E) of the Bohai Sea, where the water depth was about 16.5 m. The data of horizontal velocity with sampling interval of 2 min in 7 layers were obtained. The power spectrum analysis of these data indicates that there are very energetic infragravity waves with a period of about 6 min. The coherence spectrum analysis and the analysis of temporal variation of shear show that these infragravity waves are mainly the free wave model (properties of edge waves), in the meantime they possess some characteristics of internal waves, which are likely due to the distinctive marine environment in this area. It is speculated on that the instability processes (chiefly shear instability) of sheared stratified tidal flow owing to the effect of sea-floor slope in the coastal area might be the main mechanism generating these infragravity waves. |
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| Keywords: | Infragravity waves edge waves internal waves vertical shear of horizontal velocity internal mixing |
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