It follows the path of least resistance following the inside of the sand bar until it finds a break in it and flows back out to sea. It's clear there's a lot of power in ocean waves but let me put it in perspective for you. And so on up the speed curve. This power is what thwarts beach replenishment projects. We've all seen huge volumes of sand pumped onto the beaches, only to see it disappear in one or two winter storms.
Huge dredges pump millions of cubic yards of sand from offshore.
The storms wash it back out and the dredges start all over again. The only difference between that and making little rocks out of big ones is that it pays a lot better. I have come up with an idea I'm certain can reverse the near shore erosion process. In effect what I would do is install an incline for the wave to climb and force it to dissapate its energy before it reaches the shore. It's pretty simple really.