观测表明,进入陆架区的海洋中尺度涡旋的运动迅速衰变。这表现为涡旋表面积随时间不断扩展,而旋转角速度随时间逐渐衰减。本文从垂直层化,水平均匀的流体涡度方程出发,对上述过程进行了动力学分析。在考虑上、下边界层Ekman pump效应和侧向摩擦条件下,得出了涡旋表面积扩展和角速度衰减的解析模式。 Observations show that the movement of the mesoscale vortex entering the shelf area decays rapidly. This is manifested by the continuous expansion of the vortex surface area over time, while the angular velocity of rotation decays over time. In this paper, based on the vertical stratification and horizontal uniform fluid vorticity equation, the dynamic process of the above process is analyzed. Considering the Ekman pump effect and the lateral friction condition of the upper and lower boundary layers, the analytical models of vortex surface area expansion and angular velocity attenuation are obtained.