| 摘要: |
| 研究了风浪频谱JONSWAP谱的峰度因子γ、尖度因子PJ和N谱的尖度因子PN，参变量p，q间的关系；并在此关系上给出了由这两种谱计算的几个对应谱参量间的关系，如JONSWAP谱峰值A2(ω0)、零阶矩m0, J，平均频率ωJ，平均周期TJ和对应于N谱的峰值s(ω0)、零阶矩m0, N，平均频率ωN，平均周期TN间的关系；指出这些关系均与风浪的成长状态有关，在使用不同的谱形进行特征量的计算时，应注意不同频谱间的成长因子的一致性，以免引起计算结果的错误。 |
| 关键词: 风浪谱 谱参量 特征量 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目 ,49376255号 |
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| RELATIONS OF JONSWAP SPECTRUM AND NEUMANN-FORM V SPECTRUM CHARACTERISTIC VARIANCES |
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Shi Ping1, Guo Peifang2
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1.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301;2.Departmeat of Oceanology, Ocean University of Qingdao, Qingdao 266003
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| Abstract: |
| The JONSWAP Spectrum (JS) and Neumann-form Spectrum (NS) are wind wave spectra often compared with each other. Sometimes people ignore their groundwork and standard in the comparison, so they make some errors. The paper discusses the relation RP (formula 8) between the JS peak factor PJ (γ) and the NS peak factor PN (p, q) on the basis of the peak factor P as comparison standard. PJ can be expressed by formula (9) and γ by formula (10) on condition RP=1, A=αg2 and ω0, J=ω0, N; and also yields several other relations of the JS and NS characteristic variances: 1) the relation Rm0 of the JS and NS zero order moments as expressed in formula (21); 2) the relation RS(ω0) of the JS and NS spectra peak values as expressed in formula (26); 3) the relation Rω2 of the JS and NS average frequencies and 4) the relation RT2 of the JS and NS average wave periods as expressed in formula (32). The paper also gives ω0 for the relation of JS and NS with the wind wave growth factors p, q, γ as expressed in formula (22), and the variances A and B as expressed respectively by formulas (23) and (24). |
| Key words: Wind wave spectrum, Spectral parameter, Characteristic variance |
