摘要
为了分析第三代海浪数学模型——SWAN模型的风浪模拟能力,分别计算了恒定风场和台风时变风场下的波浪场.恒定风场中假定不同的风速及风区长度,通过比较SWAN模型与SMB方法等经验风浪公式的计算结果,得出SWAN模型风浪模拟的适用范围.针对大风速下计算波高偏大的情况,通过分析参考波速引起的输入风速变小及拖曳力系数饱和等因素,提出了风能输入项的修正方法,并采用同步观测的风、浪资料对修正前后的计算结果进行了比较验证.结果表明,在大风速情况下,修正后的SWAN模型的模拟波高更接近于经验公式结果及实测数据.在SWAN模型风能输入项中引入参考波速引起输入风速减小及对拖曳力系数饱和因素的修正,可以更好地模拟大风速下的波浪场.
In order to analyze the simulation capability of wind waves by the third-generation numerical wave model—SWAN model,the wave fields with constant wind and non-stationary typhoon wind were calculated separately.In the constant wind fields,different wind speeds and fetches were assumed,and the calculated results by the SWAN model were compared with those calculated by some empirical wind wave formulas,such as SMD method.Accordingly,the applicable range of simulating wave height properly by the SWAN model could be obtained.Aiming at the wave height overestimated by the SWAN model under high wind speed,an amended method for the wind energy input of the model was proposed by analyzing factors such as the decrease of input wind speed induced by the reference wave velocity and the saturation of drag coefficient.The calculated results before and after the amendment were compared and validated by use of the simultaneous observations of wind and wave data.The analysis shows that the calculated results by the amended SWAN model are quite close to those by the empirical formulas and to the observed data.By introducing factors such as the decrease of input wind speed induced by the reference wave velocity and the saturation of drag coefficient into the wind energy input term,the SWAN model can satisfactorily simulate wave heights under high wind speed.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第5期585-591,共7页
Journal of Hohai University(Natural Sciences)
基金
南京水利科学研究院基金(Yy209004)
