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每年冬季因中国北方冷空气前缘东移出海南下而形成的锋面是造成台湾海峡内恶劣海况的原因之一,锋面的到临常引发快速增高的波浪,这种海况是目前作业化数值预报模式在操作上不易反映的。经验证明根据元素波模式推衍所得的面积风域法推算波浪,适合于推导季风期间海况的一种方法。本文将锋面期间风域是移动的特性结合面积风域理论,作为推算锋面抵达时推算波高的方法。本文提出加权风场内插法计算各时刻各网格点的风速,使得面积风域理论简化为在网格点的离散计算。文中根据锋面期间实际观测数据计算波能传播速率与风能传授系数等参数,经由案例分析的结果显示这个离散化面积风域法可以合理地推算锋面期间快速成长的波高。
The fronts that emerge each winter in east China due to the cold air front in northern China are formed as one of the reasons for the adverse sea conditions in the Taiwan Strait. The fronts are the ones that cause rapidly increasing waves. This sea state is currently operational numerical prediction model In the operation is not easy to reflect. Experience has proved that the method of estimating the wave based on the area wind method derived from the element wave model is suitable for deriving the sea state during the monsoon. In this paper, the characteristics of the wind field during the frontal movement are combined with the area wind theory, which is used as a method to calculate the wave height when the frontal plane arrives. In this paper, a weighted wind field interpolation method is proposed to calculate the wind speed of each grid point at each moment so that the theory of area wind field can be simplified as the discrete calculation at the grid point. In this paper, parameters such as wave energy propagation rate and wind energy transfer coefficient are calculated according to the observed data during the frontal period. The case study shows that this discretized area wind method can reasonably estimate the wave height of rapid growth during the frontal period.