| Laboratory study and analysis of the instability of alongshore currents |
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| 作者姓名： | REN Chunping ZOU Zhili |
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| 作者单位： | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 50479053 and 10672034 |
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| 摘 要： | A laboratory experiment on the instability of alongshore currents was conducted on a plane beach with slope 1:40. Low-frequency fluctuations of alongshore currents with the period of approximately 100 s were observed. The dominant frequency and amplitudes of the oscillations of alongshore currents were determined using the maximum entropy method and the regression method of trigonometric function. The variations across the beach cross-section of the oscillation amplitudes of the alongshore current were given. The linear shear instability theory was used to analyze the mechanism of the oscillation, and the calculated results agreed with measurements. This confirms that the observed fluctuation of alongshore currents is due to the shear instability of alongshore currents.
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| 关 键 词： | 不稳定分析 实验室试验 海流观测 近岸 电流振荡 频率波动 最大熵方法 三角函数 |
| 收稿时间： | 4/6/2008 12:00:00 AM |
| 修稿时间： | 2008/11/27 0:00:00 |
Laboratory study and analysis of the instability of alongshore currents |
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| REN Chunping,ZOU Zhili.Laboratory study and analysis of the instability of alongshore currents[J].Acta Oceanologica Sinica,2009,28(4):96-106. |
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| Authors: | REN Chunping and ZOU Zhili |
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| Institution: | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | A laboratory experiment on the instability of alongshore currents was conducted on a plane beach with slope 1:40. Low-frequency fluctuations of alongshore currents with the period of approxi-mately 100 s were observed. The dominant frequency and amplitudes of the oscillations of along-shore currents were determined using the maximum entropy method and the regression method of trigonometric function. The variations across the beach cross-section of the oscillation amplitudes of the alongshore current were gi... |
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| Keywords: | alongshore currents shear instability water waves coast |
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