| CHGS method for numerical forecasting of typhoon waves——Ⅰ. Spectrum of waves in growing phase |
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| 作者姓名： | Sui Shifeng |
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| 作者单位： | South China Sea Institute of Oceanology, Academia Sinica, Guangzhou, China |
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| 基金项目： | The research reported was supported by the National Natural Science Foundation of China. |
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| 摘 要： | Owing to the fact that the wind speed and direction of typhoon vary rapidly with time and space in typhoon fetch; the nearer to the typhoon eye the greater the wind velocity, and the shorter the wind fetch the smaller the wind time,as a result,the more difficult for the wind wave to fully grow. Hence.in typhoon wave numerical calculation it is impossible to use the model for a fully grown wave spectrum. Lately, the author et at. presented a CHGS method for numerical forecasting of typhoon waves, where a model for the growing wave spectrum was set up (see Eq. (2) in the text). The model involves a parameter indicating the growing degree of wind wave, i. e. ,the mean wave age β. When βvalue is small, the wave energy is chiefly concentrated near the peak frequency, so that the spectral peak gets high and steep; with the increase of β the spectral shape gradually gets lower and gentler; when β=Ⅰ, the wave fully grows, the growing spectrum becomes a fully grown P-M spectrum. The model also shows a spect
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| 收稿时间： | 1989/5/15 0:00:00 |
| 修稿时间： | 1989/12/3 0:00:00 |
CHGS method for numerical forecasting of typhoon waves——Ⅰ. Spectrum of waves in growing phase |
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| Sui Shifeng.CHGS method for numerical forecasting of typhoon waves——Ⅰ. Spectrum of waves in growing phase[J].Acta Oceanologica Sinica,1990,9(3):343-352. |
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| Authors: | Sui Shifeng |
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| Institution: | South China Sea Institute of Oceanology, Academia Sinica, Guangzhou, China |
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| Abstract: | Owing to the fact that the wind speed and direction of typhoon vary rapidly with time and space in typhoon fetch; the nearer to the typhoon eye the greater the wind velocity, and the shorter the wind fetch the smaller the wind time,as a result,the more difficult for the wind wave to fully grow.Hence.in typhoon wave numerical calculation it is impossible to use the model for a fully grown wave spectrum.Lately, the author et at.presented a CHGS method for numerical forecasting of typhoon waves, where a model for the growing wave spectrum was set up (see Eq.(2) in the text).The model involves a parameter indicating the growing degree of wind wave, i.e., the mean wave age β.When βvalue is small, the wave energy is chiefly concentrated near the peak frequency, so that the spectral peak gets hi gh and steep; with the increase of β the spectral shape gradually gets lower and gentler; when β=Ⅰ, the wave fully grows, the growing spectrum becomes a fully grown P-M spectrum.The model also shows a spectral "overshooting" phenomenon within the "balance zone". |
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