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为估算经过海面时摩擦力对台风风场造成的影响,引入了适用于从低风速到高风速计算的关于海面10 m高风速U_(10)的海面拖拽系数C_d的表达式,进一步发展了以Vickery台风风场模型为基础的台风风场经验模型。然后,将利用不同Charnock常数μ计算得到海面拖拽系数C_d随U_(10)的变化情况与实测数据进行了对比。最后,将台风风场经验模型应用于台风“黑格比”期间经过海面时台风风场的数值模拟。将计算得到的台风1 h平均风速与海面观测塔获取的观测数据进行了对比。研究结果表明,基于此海面拖拽系数C_d表达式的台风风场经验模型能对经过海面时的台风风场进行很好的模拟。
In order to estimate the effect of friction on the typhoon wind field when passing the sea surface, an expression for sea surface drag coefficient C_d of 10 m above the sea surface with high wind speed U_ (10), which is suitable for calculation from low wind speed to high wind speed, is introduced and further developed Typhoon Wind Field Experience Model Based on Vickery Typhoon Wind Field Model. Then, using the different Charnock constants μ, the sea surface drag coefficient C_d is compared with the measured data with the change of U_ (10). Finally, the typhoon wind field empirical model is applied to the numerical simulation of the typhoon wind field when passing the sea surface during typhoon “Hagupit ”. The calculated 1-h typhoon mean wind speed was compared with the observation data obtained from the sea surface observation tower. The results show that the typhoon wind field empirical model based on the sea surface drag coefficient C_d can well simulate the typhoon wind field when passing the sea surface.