Respuesta :
"swirling-surf" is simply a more accurate and detailed description of surf that occurs in the ocean. "Swirling" implies that the surf is especially large and rough.
In English language, an object is said to be swirling if it is moving in a twisting pattern. A surf on the other hand refers to bubbles, which are formed by the ocean waves as they hit the shore. Thus, swirling - surf is talking about ocean waves that are moving in spiraling or twisting manner.