| STATISTICAL PROPERTIES OF WAVE GROUPS DESCRIBED BY GROUP-INDUCED LONG WAVES |
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| 作者姓名： | 林维琪 黄培基 |
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| 作者单位： | First Institute of Oceanography，SOA，Qingdao，266003，First Institute of Oceanography，SOA，Qingdao，266003 |
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| 基金项目： | This project was funded by the National Natural Science Foundation of China |
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| 摘 要： | A new method using group-induced second-order long waves (GSLW) to describe wave groups is presented in this paper on the basis of the GSLW theory by Longuet- Higgins and Steward (1964) . In the method , the parabolic relationship between GSLW and the wave envelope is first deduced , and then the distribution function of GSLW amplitude is derived . Thus, the formulae in terms of the moments of GSLW and short wave spectra for the average time duration and the mean length of runs of wave heights exceeding a certain level can be derived . A new groupiness factor equivalent to half the mean wave number in wave groups is defined by taking into account the widths of spectra of GSLW and short waves . Compared with theoretical results of others , ours are closer to measured wave data .
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| 收稿时间： | 21 March 1991 |
Statistical properties of wave groups described by group-induced long waves |
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| Lin Weiqi,Huang Peiji.STATISTICAL PROPERTIES OF WAVE GROUPS DESCRIBED BY GROUP-INDUCED LONG WAVES[J].Chinese Journal of Oceanology and Limnology,1992,10(1):57-67. |
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| Authors: | Lin Weiqi Huang Peiji |
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| Institution: | (1) First Institute of Oceanography, SOA, 266003 Qingdao |
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| Abstract: | A new method using group-induced second-order long waves (GSLW) to describe wave groups is presented in this paper on the basis of the GSLW theory by Longuet- Higgins and Steward (1964) . In the method , the parabolic relationship between GSLW and the wave envelope is first deduced , and then the distribution function of GSLW amplitude is derived . Thus, the formulae in terms of the moments of GSLW and short wave spectra for the average time duration and the mean length of runs of wave heights exceeding a certain level can be derived . A new groupiness factor equivalent to half the mean wave number in wave groups is defined by taking into account the widths of spectra of GSLW and short waves . Compared with theoretical results of others , ours are closer to measured wave data . |
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| Keywords: | wave group group- induced second- order long wave average time duration mean length of runs groupiness factor |
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