杭州湾中部波浪统计分布

摘要

利用杭州湾中部一年实测波浪资料,分析了实测波高分布、波周期分布和波高周期联合分布.基于双参数威布尔分布模式,采用最小二乘法拟合得出波高分布和波周期分布模式,并与其他理论分布模式作了比较.结果表明:(1)双参数威布尔分布对杭州湾中部实测波高分布的拟合效果好于Glu-hovski分布,而且该模式在实测波周期分布上的拟合效果也相对优于孙孚分布和侯一筠分布,但威布尔分布在对大周期比区域的预测值偏小,而其他两者分布则偏大.(2)实测联合分布与孙孚理论的联合分布有所不同.(3)威布尔分布的拟合系数与相关波参数的关系较为复杂,其中周期分布的威布尔系数与谱宽度有较好的相关性,由此可改进威布尔分布的拟合效果.(4)偏东向的流速对波高分布和波周期分布存在微弱的影响.%The wave height distribution,wave period distribution and joint distribution were analyzed using the one-year wave data, which was measured in the central Hangzhou Bay.Based on the two-parameter Weibull distribution model,the least squares method was applied to obtain the wave height distribution and the wave period distribution pattern,which was then compared with other theoretical distributions.The results show that:(1)the two-parameter Weibull distribution has a better effect on the distribution of the measured wave height than Gluhovski model,and the fitting effect of the model on the distribution of the measured wave period is better than Sunfu model and Hou Yijun model.But Weibull distribution with higher wave period is smaller than the measured data,while the other two models are larger than the measured data.(2)The joint distribution of measured wave is not in accordance with Sunfu theory.(3)The relationships between Weibull fitting coefficients and other parameters are complex, while the relationship between Weibull fitting coefficients of wave period and spectral width is prominent,and the results can be used to improve the fitting effect of Weibull model.(4)The velocity of the eastward current shows a weak influence on the wave height distribution and the wave period distribution.