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本文建立了一个用于台风海面风场后报的数值模式,并给出了用于实际台风海面风场后报时求解上述模式的全过程,首先根据边界层风速垂直分布特点,对贴地面摩擦应力使用平均风进行参数化,进而导出边界层平均风动力学方程,对上述动力学方程积分到一准稳态,得到边界层平均风分布;再使用Monin-Obkhov相似理论,将平均风换算到10m高度,从而得到10m高度风场.对3个台风过程,给出了10m高度风场和浪场的数值后报结果.海浪同实测的结果比较表明,该风场模式的结果在实测点的后报风与实测风较一致,两者相关系数为0.95左右,台风影响测点时,极值误差均在2m/s以内,平均误差范围约10%;后报风向与实测风向的平均绝对值误差为20°,将该后报风场模式用于海浪数值后报也得到了满意的结果,后报波高与实测波高的相关系数约为0.95,最大有效波高和跨零周期的实测值与后报值相差符合得很好.这些结果均表明本文提出的风场模式是合理的,并且适用于强海况的数值计算.
In this paper, we establish a numerical model for reporting the typhoon sea surface wind field and give the whole process after the typhoon sea surface wind field is applied to solve the above mode. First, according to the vertical distribution of the wind velocity in the boundary layer, The mean wind parameters are used to derive the boundary layer average wind dynamics equation, and the above dynamic equations are integrated into a quasi-steady state to obtain the average wind distribution in the boundary layer. Using the Monin-Obkhov similarity theory, the average wind is converted to 10 m Height, resulting in 10m height wind field. For the three typhoon processes, the numerical results of 10m height wind field and wave field are reported. The comparison of the waves with the measured results shows that the result of the wind field model is consistent with the measured wind at the measured point, and the correlation coefficient between the two is about 0.95. When the typhoon affects the measuring point, the extreme errors are all at 2m / s, the average error range of about 10%; after the wind direction and the measured absolute mean absolute error of 20 °, the wind pattern after the newspaper reported the value of the waves have also been satisfied with the results reported after the wave height and measured The correlation coefficient of wave height is about 0.95. The maximum effective wave height and the measured value across the zero period are in good agreement with the last reported value. These results show that the proposed wind field model is reasonable and suitable for the numerical calculation of strong sea conditions.