Two tidal bulges on alternate sides of the Earth, with the solid Earth rotating under them. Tidal effects are greatest when the configuration of the coastline includes narrow openings - such as estuaries, bays, straits, etc. Wave refraction is another important shore process, produced when a linear wave front encounters shallowing water on a path at an angle to the coastline. The portion of the wave front in contact with the coast slows, bending the front coastwards, and concentrating the erosional power on the headlands, while depositing beaches in the bays. Another result is longshore currents , with stepwise movement of sand down the beach.
Water returning seawards often is in rip currents which pass the breakers zone.
Santa Barbara's breakwater. Beach features are berms, bars, dunes , etc.