I located this paper in a Scientific American book called Ocean Science , which is a compilation of articles. Note that a tsunami is a seismic sea wave. Note downed trees in the surf zone. Snow fences on the beach at Tybee Island, Georgia, used to slow wind and cause sand deposition from wind. Note the dune building that has occurred between the fences.
Vegetation stabilizes coastal dunes.
Signs ask visitors not to walk on the dunes to protect the vegetation. There is a rise and fall in sea level of approximately a meter or more, once or twice per day. The moon's gravitational pull. A bulge in the water on the Earth's surface occurs on both the side facing the moon and the side away from the moon. The highest tides in the world occur in the Bay of Fundy in Nova Scotia, Canada.