The waves may be animated by connecting the "Time" parameters of both the "BreakWave Displacement" and " BreakWave Scatter" to a time node. To do this, change one of the "Time" parameter to function and connect a time node to the brown node. Then change the function to a texture. Finally assign that texture to the other "Time" parameter.
The wave speed may be controlled through the "Time period" parameters. The period is expressed in seconds.