基于实测资料的南海海浪波高和周期联合分布研究

Study on the Joint Distribution of Wave Heights and Periods in the South China Sea Based on Observed Data

海浪波高和周期联合分布关系是海洋工程设计的重要参数,尤其对浮式结构设计更加重要。目前波高和周期的联合分布已有大量理论模型和经验模型。基于南海北部海区长达1年的实测波高和周期数据,对多种波高和周期联合分布理论模型和经验模型进行适应性分析。研究结果表明:Longuet-Higgins模型、C.N.E.X.O.模型、孙孚模型和郑桂珍改进模型等理论模型与实测数据相比存在一定偏差;Bitner-Gregersen波高和周期的经验模型较为适用于南海北部海域。同时还通过参数拟合得到南海波高周期联合分布曲线,该结果可为南海海洋工程设计提供参考。

The joint distribution of wave heights and periods is an important design basis of ocean engineering design,especially for floating structure design.Many theoretical models and empirical formulae for joint distribution of wave heights and periods have been proposed.In this paper,1-year measured wave heights and periods data in north of the South China Sea are applied to examine the joint distribution models of wave heights and periods.The results show that the theoretical models of Longuet-Higgins,C.N.E.X.O.,Sun and Zheng are not suitable to the South China Sea,while the empirical model of Bitner-Gregersen is suitable to this area.Additionally,the parameters of the Bitner-Gregersen formula are calibrated,and the contour of wave height and period is plotted.The results can be applied to the ocean engineering design in the South China Sea.