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风浪波高和周期的联合概率密度分布 总被引：1，自引：0，他引：1
本文采用有代表性的44008美国国家浮标站2003年1～3月实测的海浪谱密度资料,选取三次大风过程进行风浪谱分析。通过对实测平均海浪谱与PM谱、JONSWAP谱及Torsethaugen谱的比较,得到PM谱拟和最好。然后用国际上最先进的随机波分析方法,根据协方差矩阵的循环嵌套技术,以实测平均谱与PM谱为靶谱,对随机波面进行模拟。得到由模拟波面统计的特征值及估计的谱与实测谱结果极为相近,谱峰及谱峰频率都基本一致。说明利用模拟波面研究海浪具有代表性,它可以反映实测海浪的特征。利用Longuet-Higgins(1983)模型计算波高-周期联合概率密度分布,得到变换高斯过程计算的波高、周期联合分布与实测情况基本相同,更好地描述了波高-周期联合概率密度分布。 相似文献
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本文给出应用实测波浪数据确定JONSWAP谱参数的方法，若Hs,Tz,Tc分别为实的有效波高，平均上跨零线周期，平均峰－峰周期并令y=Tz/Tc，本文导出求解谱参数γ值的方程f（γ，y）＝0。根据这个方程的解并应用最小二乘法，γ作为y的函数的表达式可写为（对于2.54≤γ≤15.34及1.6≤y≤1.79）。 相似文献
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双峰谱型海浪的波高和周期分布 总被引：1，自引：0，他引：1
本文利用收集到的实测双峰谱型海浪过程资料，把这些资料以波高和周期的相关系数为参数分布５组，讨论每组双峰谱型下波高、周期的统计分布，并探讨了相关系数对波高分布和周期分布的影响。 相似文献
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本文利用收集到的实测双峰谱型海浪过程资料，把这些资料以波高和周期的相关系数为参数分成５组，讨论每组双峰谱型下被高、周期的统计分布．并探讨了相关系数对波高分布和周期分布的影响。 相似文献
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采用目前国际上最新的随机波分析方法,由协方差矩阵的循环嵌套技术,对美国国家浮标44008站2002年6月一典型的双峰海浪谱资料进行谱分析.以实测平均谱为靶谱,对随机波面进行模拟.得到模拟波面估计谱与实测谱极为相近,谱峰及谱峰频率都基本一致.说明利用模拟波面研究海浪具有代表性,它可以反映实测海浪的特征.利用实测海浪谱密度,统计波特征量的周期概率分布,得到理论周期概率密度与估计周期概率密度分布相符较好,且与模拟波面的波周期分布也较好的一致.利用Longuet-Higgins(1983)模型计算了波高-周期联合概率密度分布.得到变换高斯过程计算的波高与周期联合分布与实测情况基本相同,更好地描述了波高-周期联合概率密度分布. 相似文献
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本文利用实测双峰谱型海浪过程资料，以３种典型谱型分别讨论了双峰谱型下波高与周期的联合分布，并与理论结果进行了比较。 相似文献
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1.IntroductionGreat progress has been madeinthe statistics of sea waves based onthe envelopetheory of Gaus-sian processes.Longuet-Higgins(1975,1983)first obtainedthe joint probability distributionfunction(PDF)of wave heights and periods.His work was exten… 相似文献
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We show how to calculate the encountered wave period distribution for a ship traveling with constant speed on a Gaussian random sea with a directionally distributed frequency spectrum. 相似文献
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西北干旱区湖泊沉积记录反映的全新世气候波动周期性变化 总被引：12，自引：0，他引：12
采用多窗谱分析方法研究了夏季风边缘区——甘肃民勤盆地石羊河流域湖泊沉积物所记录的全新世以来气候波动的周期性。结果表明，该区域的气候变化存在明显的1553、1190、686、617、504、314、180及131a等主要周期。1553a主周期变化所对应的明显干湿期有6—7次。其他百年尺度的周期变化在早中全新世波动幅度较大，到中、晚全新世其波幅逐渐减小。其中准1500a的周期波动在整个全新世石羊河流域气候变化中都有反映，而500～700a的周期波动在中全新世气候变化过程中起重要作用。 相似文献
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- In this paper, by using the wave data from a few oceanographic observation stations in the coastal zone of the Yellow Sea, the East China Sea and the South China Sea, the long-term joint distribution of the one-tenth large (or significant) wave height with average period is studied. The statistical data demonstrate that the long- term distribution of the one- tenth wave height or average period fits the log-normal distribution, thus the joint distribution also fits the two-dimensional log-normal distribution. Then the conditional probability distribution of the average period is derived, and the range as well as the mode of the average wave period corresponding to a certain return period of wave height can be calculated easily. 相似文献
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侍茂崇 《中国海洋大学学报(自然科学版)》1993,(Z2)
对小风天气条件下表层海流观测资料进行能谱密度分析,指出:东分量海流具有很明显的0.51d、3.9d和7.7d周期。0.51d是半日潮周期,即12h25min的周期;3.9d周期恰与赤道重力陷波n=2相对应,这是南纬3°～4°范围内一个重要波动;7.7d则是大小潮周期。而在北分量海流能谱中,则只有潮流0.51d和7.7d周期,3.9d周期消失,它进一步说明陷波的特征。此外,还用7m和40m层流资料与表层流进行对比,两者变化规律基本一致。 相似文献
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This study makes use of the concept of wave age in estimating ocean wave period from space borne altimeter measurements of backscattering coefficient and significant wave height. Introduction of wave age allowed better accounting of the difference between swells and wind waves. Using two years (1998 and 1999) data of TOPEX/Poseidon altimeter and ocean data buoy observations in the Indian Ocean, coefficients were generated for wave period, which were subsequently tested against data for the years 2000 and 2001. The results showed the wave period accuracy to be of the order of 0.6 sec (against 1.3 sec obtained with the semiempirical approach, reported earlier). 相似文献
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This study makes use of the concept of wave age in estimating ocean wave period from space borne altimeter measurements of backscattering coefficient and significant wave height. Introduction of wave age allowed better accounting of the difference between swells and wind waves. Using two years (1998 and 1999) data of TOPEX/Poseidon altimeter and ocean data buoy observations in the Indian Ocean, coefficients were generated for wave period, which were subsequently tested against data for the years 2000 and 2001. The results showed the wave period accuracy to be of the order of 0.6 sec (against 1.3 sec obtained with the semiempirical approach, reported earlier). 相似文献
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Fu Yuhua
Senior Engineer China Offshore Oil Development Engineering Corporation P. O. Box Beijing 《中国海洋工程》1995,(3)
- This paper presents the method of determining JONSWAP spectrum by using measured wave data. If Hs, Tz and Tc are the measured significant wave height, average zero-up crossing wave period and average period between wave crests respectively and let y = T Z / TC; this paper provides equation to solve y fromf(y,y) = 0. From the solutions of this equation and by using LSM, the expression relating y as a function of y (for 2.54相似文献