The rhythm of periodic rise and fall in coastal water levels caused by sets of waves as they arrive and create a surge and pileup of water along the surf zone. During and immediately after the sets of waves, the water level along the shore rises from all of the wave energy pushing water to the shore. Once the sets of waves cease or lull, the water will escape back out to deep water-sometimes in the form of rip currents or rip tides �� before another set of waves arrive to complete the cycle called the surf beat.