Laboratory study and analysis of the instability of alongshore currents

REN Chun-ping; ZOU Zhi-li

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REN Chun-ping, ZOU Zhi-li. Laboratory study and analysis of the instability of alongshore currents[J]. Haiyang Xuebao, 2008, 30(5): 113-123.

Citation:

REN Chun-ping, ZOU Zhi-li. Laboratory study and analysis of the instability of alongshore currents[J]. Haiyang Xuebao, 2008, 30(5): 113-123.

REN Chun-ping, ZOU Zhi-li. Laboratory study and analysis of the instability of alongshore currents[J]. Haiyang Xuebao, 2008, 30(5): 113-123.

Citation:

REN Chun-ping, ZOU Zhi-li. Laboratory study and analysis of the instability of alongshore currents[J]. Haiyang Xuebao, 2008, 30(5): 113-123.

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Laboratory study and analysis of the instability of alongshore currents

State Key Laboratory of Coastal and offshore Engineering, Dalian University of Technology, Dalian 116024, China

Received Date: 2008-05-04
Rev Recd Date: 2008-08-11

Abstract

Abstract

Laboratory experiments on the instability of alongshore currents were performed on a plane beach with slope 1:40.Low-frequency fluctuations of along shore currents with the period of approximately 100 s were observed.The dominant frequency and amplitude of the oscillations of along shore currents were determined using maximumentropy method and the regression method of trigonometric function,and the results showed that the variations of the amplitude of the alongshore current oscillations were similar to the variations of the mean along shore currents in the cross-shore direction.The linear shearinstability theory was used to analyze the mechanism of the oscillation,and the calculated results agreed with measurements.This confirms that the observed fluctuations of along shore currents are due to the shearinstability of alongshore currents.
- alongshore currents,
- shearinstability,
- water waves,
- coast

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References(14)

References

OLTMAN-SHAY J,HOWD P A,BIRKEMEIER W A.Shear instabilities of the mean longshore current:2.Field observations[J].Journal of Geophysical Research,1989,94:18031-18042.

BOWEN A J,HOLMAN R A.Shear instabilities of the mean longshore current:1,Theory[J].Journal of Geophysical Research,1989,94:18023-18030.

DODD N,THORNTON E B.Growth and energetics of shear waves in the nearshore[J].Journal of Geophysical Research,1990,95(C9):16075-16083.

PUTREVU U,SVENDSEN I A.Shear instability of longshore currents:a numerical study[J].Journal of Geophysical Research,1992,97:7283-7303.

金红,邹志利,邱大洪,等.海岸水动力因素对污染物输移的影响[J].海洋学报,2006,28(6):144-150.

邹志利,任春平,金红,等.沿岸流不稳定性运动实验研究[G]//第十二届中国海岸工程会议论文集.北京:海洋出版社,2005:334-338.

胡广书.数字信号处理理论、算法与实现[M].北京:清华大学出版社,2003.

徐伯勋,白旭滨.最大熵谱估计在油气检测中的应用[J].石油物探,1990,29(2):1-12.

徐伯勋,白旭滨.最大熵谱估计中振幅谱和相位谱的求法[J].石油物探,1987,26(2):66-74.

张白林.杨梦岩.最大熵谱的振幅谱和相位谱计算[J].西南石油学院学报,1993,15(4):16-24.

陈哑勇.MATLAB信号处理详解[M].北京:人民邮电出版社,2001.

GARBOW B S.CALGO Algorithm 535:The QZ algorithm to solve the generalized eigenvalue problem for complex matrices[J].ACM Transactions on Mathematical Software,1978,4:404-410.

MOLER C,STEWART G W.An algorithm for generalized matrix eigenvalue problems[J].SIAM Journal on Numerical Analysis,1973,10:241-256.

ZOU Zhi-li,WANG Shu-ping,QIU Da-hong.Longshore currents of random waves on different plane beaches[J].China Ocean Engineering,2003,17(2):265-276.

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