| Wen Shengchang(S. C. Wen),Zhang Dacuo,Chen Bohai,Guo Peifang. 1988. Theoretical wind wave frequency spectra in deep water——Ⅰ. Form of spectrum. Acta Oceanologica Sinica, (1):1－16 |
| Theoretical wind wave frequency spectra in deep water——Ⅰ. Form of spectrum |
| Theoretical wind wave frequency spectra in deep water——Ⅰ. Form of spectrum |
| Received:July 15, 1987 Revised:August 20, 1987 |
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| Author Name | Affiliation | | Wen Shengchang(S. C. Wen) | Institute of Physical Oceanography, Shandong College of Oceanography, Qingdao, China | | Zhang Dacuo | Institute of Physical Oceanography, Shandong College of Oceanography, Qingdao, China | | Chen Bohai | Institute of Physical Oceanography, Shandong College of Oceanography, Qingdao, China | | Guo Peifang | Institute of Physical Oceanography, Shandong College of Oceanography, Qingdao, China |
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| Abstract: |
| In this part ot the paper theoretical wind-wave spectra nave been derived by (1) expressing the spectrum in series composed of exponential terms; (2) assuming that the spectrum satisfies a high order linear ordinary differential equation; (3) introducing proper parameters in the spectrum; and (4) making use of some known charateristics of wind-wave spectrum, for instance, the law governing the equilibrium range. The spectrum obtained contains the zero order moment of the spectrum ω0, the peak frequency ω0 and the ratio R=ω/ω0 (ω being the mean zero-crossing frequency) as parameters. The shape of the nondimensional spectrum Š(ω)=ω0S(ω)/ω0(ω=ω/ω0) changes with R and theoretically reduces to a Dirac delta function δ(ω-1) when R=1. A spectrum of simplified form is given for practical uses, in which R is replaced by a peakness factor P=Š(1). |
| 中文摘要: |
| In this part ot the paper theoretical wind-wave spectra nave been derived by (1) expressing the spectrum in series composed of exponential terms; (2) assuming that the spectrum satisfies a high order linear ordinary differential equation; (3) introducing proper parameters in the spectrum; and (4) making use of some known charateristics of wind-wave spectrum, for instance, the law governing the equilibrium range. The spectrum obtained contains the zero order moment of the spectrum ω0, the peak frequency ω0 and the ratio R=ω/ω0 (ω being the mean zero-crossing frequency) as parameters. The shape of the nondimensional spectrum Š(ω)=ω0S(ω)/ω0(ω=ω/ω0) changes with R and theoretically reduces to a Dirac delta function δ(ω-1) when R=1. A spectrum of simplified form is given for practical uses, in which R is replaced by a peakness factor P=Š(1). |
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