| REN Chunping,ZOU Zhili. 2009. Laboratory study and analysis of the instability of alongshore currents. Acta Oceanologica Sinica, (4):96－106 |
| Laboratory study and analysis of the instability of alongshore currents |
| Laboratory study and analysis of the instability of alongshore currents |
| Received:April 06, 2008 Revised:November 27, 2008 |
| DOI： |
| Key words:alongshore currents shear instability water waves coast |
| 中文关键词: alongshore currents shear instability water waves coast |
| 基金项目:The National Natural Science Foundation of China under contract Nos 50479053 and 10672034. |
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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 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. |
| 中文摘要: |
| 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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