While the lowest point of the waves into shore, sea level is reduced and causing increased reverse out from shore. If the coast is steep at least shorten the distances up to 800 meters, this might reverse.
The lowest point of the wave is moving to shore. Sea level will drop and the sea retreating from the coast. If the coast is a little steep. This may shorten the duration of the retreat up to 800 meters.
While the bottom of the wave moving into the side. The sea level will decrease and the edge recession back out of the sea coast. If the coast is steep. To shorten the distance this retreat can be up to 800 meters.