图1. 二维毛细重力水波在均匀流作用下的传播.$\zeta (x,t)$是自由面波动,$c$是波速度
Fig. 1. Schematic of the Eulerian framework for two-dimensional propagating capillary-gravity waves with a uniform flow. $\zeta (x, t)$ is the free surface elevation and $c$ is the wave velocity