Volume 5 Issue 4
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Ya-long ZHOU, Zhi-li ZOU, Kai YAN. 2012: Experimental study on modulational instability and evolution of crescent waves. Water Science and Engineering, 5(4): 419-427. doi: 10.3882/j.issn.1674-2370.2012.04.006
Citation: Ya-long ZHOU, Zhi-li ZOU, Kai YAN. 2012: Experimental study on modulational instability and evolution of crescent waves. Water Science and Engineering, 5(4): 419-427. doi: 10.3882/j.issn.1674-2370.2012.04.006
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Experimental study on modulational instability and evolution of crescent waves

doi: 10.3882/j.issn.1674-2370.2012.04.006

  • State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, P. R. China

Funds:  This work was supported by the National Natural Science Foundation of China (Grant No. 51079024) and the National Foundation for Creative Research Groups (Grant No. 50921001).
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  • Corresponding author: Ya-long ZHOU
  • Received Date: 2011-10-18
  • Rev Recd Date: 2011-12-26
    Abstract
  • A series of experiments on the instability of steep water wave trains in water with finite water depths and infinite water depths in a wide wave basin were performed. It was found that under the coupled development of modulational instability and class-II instability, the initial two-dimensional steep wave trains evolved into three-dimensional crescent waves, followed by the occurrence of disordered water surfaces, and that the wave energy transferred to sidebands in the amplitude spectrum of the water surface elevation. The results also show that water depth has a significant effect on the growth of modulational instability and the evolution of crescent waves. The larger the water depth, the more quickly the modulational instability suppresses class-II instability.

     

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